Yinong Liu

Yinong Liu
University of Western Australia | UWA · Department of Mechancal Engineering

PhD

About

336
Publications
52,324
Reads
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9,550
Citations
Citations since 2017
88 Research Items
4631 Citations
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201720182019202020212022202302004006008001,000
201720182019202020212022202302004006008001,000
201720182019202020212022202302004006008001,000
Introduction
My current research topics include: *Shape memory alloys *Superalloys *Metallic composite *Elastic strain engineering *Thin films for MEMS
Additional affiliations
January 1994 - July 2021
University of Western Australia
Position
  • Professor
Description
  • Shape memory alloys, solid phase transformations, superalloys, metal composites

Publications

Publications (336)
Article
In this study, the microstructure evolution and nanoindentation behavior of a Ti-20Zr-9 Nb-4Sn (at%) alloy aged at 600 ºC for 1–60 h were investigated by field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, Vickers microhardness test and nanoindentation technique to show the potential for precipitation strengthening ef...
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Alloys with high yield strength and ductility are attractive for application because of their potential to offer mass reduction, energy savings, and enhanced structural reliability. However, increasing strength usually comes at the expense of ductility, which is commonly known as the strength-ductility trade-off for metal alloys. In this work, we e...
Article
This study investigated the process of the Lüders band formation and propagation within geometrically graded plate samples of a pseudoelastic NiTi during the stress-induced martensitic transformation by means of digital image correlation full-field strain measurement. The geometrically graded plate samples had parabolic width profiles in concave an...
Article
The mechanism of low thermal expansion phenomenon in antiferromagnetic FeMn alloys needs to be revealed. In this work, the evolution of lattice thermal expansion and internal stress in FeMn alloys was investigated by in-situ synchrotron X-ray diffraction during thermal cycling. Preceding the martensitic transformation, the coefficient of lattice th...
Article
With the recent upsurge in electronic and telecommunications industries, there is an extensive demand for thermal interface materials (TIMs) with integrated high thermal conductivity and flame resistance to ensure the performance, lifetime, and safety of electronic devices. Traditional polymer-based TIMs have failed to meet this demand owing to the...
Article
For biomedical titanium alloys, the reduction of their elastic modulus approximating that of human bone (~30 GPa) is highly required for using them as bone implant materials to reduce the risk of stress shielding. In this study, Ti15 Nb(4–6)Sn (at.%) shape memory alloys were developed to achieve the bone-like elastic modulus for biomedical applicat...
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Enhanced oxidation resistance is a primary demand for the application of refractory high-entropy alloys (RHEAs) at elevated temperatures. In this study, Al was added to a Ti 2 VZrNb RHEA to partially substitute Nb to improve its oxidation resistance and mechanical properties. The alloy was found to have an increased oxidation resistance by forming...
Article
This paper reports a new aspect of the Lüders-type deformation of NiTi. This is on the occurrence of lateral shear strains in a tension-induced Lüders deformation process. The phenomenon was studied by means of digital image correlation analysis. It was found that the lateral shear strains occurred in opposite directions within the Lüders band, app...
Article
This study investigated the effects of laser scanning speed on the microstructure, phase transformation and properties of NiTi alloys fabricated by laser powder bed fusion (LPBF). In this study, the contributions of metallurgical factors under different scanning speeds, such as Ni evaporation, Ni4Ti3 precipitation, dislocations and internal stress,...
Article
Near-equiatomic NiTi shape memory alloys are known to exhibit Lüders-type deformation associated with a stress-induced transformation. Many studies have been conducted in the past mainly focusing on the macroscopic characteristics of the phenomenon and some theories have been proposed in the literature to explain its mechanisms, but some aspects of...
Article
This paper studies the estimation of titanium oxide (TiO2) thickness on a thermally oxidized nickel titanium (NiTi) alloy based on its surface color. The NiTi plate specimens were subjected to oxidation at temperatures from 450 °C to 900 °C for different duration to induce the formation of oxide layers of different thicknesses. The oxide thickness...
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Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture behaviors of Ni-based single crystal superalloy at...
Article
This study investigated the transformation behaviour of small-scale confined B2→R phase transformation in a Ni47Ti49Fe2-Nb2 alloy. Such confined transformation was achieved by introducing a high density of dislocations in the alloy through warm wire drawing. In contrast to the thermally induced B2→R transformation in a conventional polycrystalline...
Article
In this study, a Lüders-type deformation with ∼40% strain of B19' martensite phase was observed in a Ni47Ti49Nb2Fe2 alloy at −50 °C. Such phenomenon was attributed to the nearly equal critical stresses of both dislocation slip and twinning, which result in the two deformation mechanisms co-operate concurrently. The large-strain Lüders-type deformat...
Article
Strength and toughness have been often considered as mutually exclusive properties in many synthetic materials. Natural materials like nacre have overcome this conflict by optimizing internal architecture at the nanoscale. In this work, nacre-inspired graphene oxide (GO)-poly (methyl methacrylate) (PMMA) nanocomposite is fabricated, which has a “br...
Article
Architected metallic materials generally suffer from a serious engineering problem of mechanical instability manifested as the emergence of localized deformation bands and collapse of strength. They usually cannot exhibit satisfactory shape recoverability due to the little recoverable strain of metallic constituent material. After yielding, the met...
Article
In this work, we designed a NiTiFe-Nb nanowire composite to achieve a high-stability and small-hysteresis R phase two-way shape memory effect (TWSME). The R-phase TWSME was achieved in the composite in an annealed state without thermomechanical training due to the inherent internal stresses associated with the Nb nanowires, as demonstrated by in si...
Article
Actuators triggered by water evaporation have found potential applications in a wide range of emerging fields, including smart structures, power generators, artificial muscles, and soft robots. In addition to poor mechanical performance, conventional actuators raise major economic and environmental concerns due to their expensive and complex synthe...
Article
TiNi-based shape-memory alloys are known to exhibit a strain glass state under certain conditions, generally in the presence of high-density defects such as excess solute atoms or alloying elements, dislocations, and nanoprecipitates. In this paper, we report a strain glass transition in a nanocrystalline Ti50Ni35Pt15 alloy. The nanocrystalline str...
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This study explored a multi-mechanism approach to improving the mechanical properties of a CoCrFeMnNi high-entropy alloy through non-equiatomic alloy design and processing. The alloy design ensures a single-phase face-centered cubic structure while lowering the stacking fault energy to encourage the formation of deformation twins and stacking fault...
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Isothermal annealing of a eutectic dual phase Ni–Mn–Sn–Fe alloy was carried out to encourage grain growth and investigate the effects of grain size of the γ phase on the martensitic transformation behaviour and mechanical properties of the alloy. It is found that with the increase of the annealing time, the grain size and volume fraction of the γ p...
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Full-text available
Revealing the atomistic mechanisms for the high-temperature mechanical behavior of materials is important for optimizing their properties for service at high-temperatures and their thermomechanical processing. However, due to materials microstructure’s dynamic recovery and the absence of available in situ techniques, the high-temperature deformatio...
Article
This study investigated the collective evolution of martensite variant structures, the development of crystallographic textures and the load partitioning among the variants during tensile deformation in a commercial polycrystalline NiTi wire by means of in-situ high-energy X-ray diffraction technique. The cold-worked and then crystallized NiTi wire...
Article
This paper reports a study of multilayer nanolamellar Mo/Nb/TiNi composites designed by the principle of martensitic transformation enabled lattice strain matching. The composite was fabricated by hot packaged accumulative roll bonding (PARB) and wire drawing. The composite showed an apparent yield strength of ∼1200 MPa and a recoverable superelast...
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This paper reports a synergistic design of high-performance BCC high-entropy alloy based on the combined consideration of the principles of intrinsic ductility of elements, maximum atomic size difference for solid solution strengthening and the valence electron concentration criterion for ductility. The single-phase BCC HfNbTaTiV alloy thus designe...
Article
Taking full advantage of intrinsic high strength of nano-reinforcements has been proven difficult in a composite until the concept of strain matching was experimental verified in a nanowire Nb/TiNi in-situ composite, which was obtained via solidifying eutectic Nb/TiNi and subsequent severe wire drawing. However, the volume fraction of the nano-rein...
Article
This study explores a new concept of the synergy between two constituent shape memory alloys (SMAs) in a composite to achieve a wide superelastic temperature window. In this work, a nanocrystalline NiTi/ NiTiNbFe dual-SMA composite is designed, in which two constituent SMAs are both capable of stress-induced martensitic transformation, but within d...
Article
Nacre is a natural composite featuring exceptional mechanical properties such as high strength and high toughness. Its unique structure is now universally applied in engineering bioinspired materials. On the other hand, it is still a technical challenge to investigate its interfacial strength and fracture mechanisms at micro or nano-scale. In this...
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It is known that Ni-based superalloys experience microstructural rafting during high temperature straining. This paper presents a comparative study of the different rafting models by means of finite element modeling and experimentation investigation. It was found that uniaxial elastic loading does not alter the misfit or misfit isotropy of the stru...
Article
Near-equiatomic NiTi alloys are known to exhibit a thermoelastic B2–B19′ martensitic transformation, which gives rise to their unique properties of the shape memory effect and pseudoelastic effect. This transformation can be induced by the application of a stress. The stress-induced transformation nucleates locally and randomly within the body of t...
Article
The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated by means of in-situ synchrotron high energy X-ray diffraction (HEXRD) and in-situ transmission electron microscopy (TEM) analysis during tensile deformation. The HEXRD measurement indicated that the W nanowires exhibited an average lattice strain of about 1.50%, wh...
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Full-text available
Nanosized materials are known to have the ability to withstand ultralarge elastic strains (4–10%) and to have ultrahigh strengths approaching their theoretical limits. However, it is a long‐standing challenge to harnessing their exceptional intrinsic mechanical properties in bulk forms. This is commonly known as “the valley of death” in nanocomposi...
Article
This study investigated the mechanisms and temperature dependence of the R phase variant reorientation deformation in a nanocrystalline NiTi wire by means of in-situ synchrotron high-energy X-ray diffraction technique during tensile deformation. The NiTi wire exhibited a single stage B2 → R transformation upon cooling with the R → B19′ martensitic...
Article
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Near-equiatomic NiTi is known to exhibit multiple martensitic allotropes, including B19', B19'' and BCO. Formation of these martensites is associated with volume expansions, thus hydrostatic loading has direct influence on the stability, ground-state, transformation pathways and the structures of these phases. This work was conducted to clarify som...
Article
Achieving concurrent good mechanical and magnetic properties is highly desirable for ferromagnetic shape memory alloys for meaningful applications, yet is challenging due to the difficulty to combine ideal microstructure and magnetism in one. This work demonstrates an alloy design strategy to overcome this challenge in a Ni51.5Mn40-xFexSn8.5 (x = 5...
Article
The ideal elastic limit is the upper bound of the achievable strength and elastic strain of solids. However, the elastic strains that bulk materials can sustain are usually below 2%, due to the localization of inelastic deformations at the lattice scale. In this study, we achieved >5% elastic strain in bulk quantity of metallic glass, by exploiting...
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This work investigates the evolution of the crystal structure of the topologically closed packed orthorhombic P phase precipitate in a Re-containing Ni-based single crystal superalloy during thermal exposure. The P phase is formed with a thin needle morphology. The precipitate is formed from the matrix with an initial complex atomic arrangement whi...
Article
This paper reports a study on the use of nickel-titanium (NiTi) shape memory alloy (SMA), steel and polypropylene (PP) fibre as reinforcement in self-compacting concrete (SCC) to improve its load bearing capability and fracture resistance. The fibre’s type and its property between fibre and concrete matrix significantly influence the flexural perfo...
Article
Self-compacting concrete presents good workability to fill complicated forms without mechanical vibrations. This concrete is often reinforced with fibres to improve the strength and toughness. This study investigated the use of nickel -titanium (NiTi) shape memory alloy fibres in comparison with polypropylene and steel fibres in self-compacting con...
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This article provides experimental and numerical data for the propagation of stress-induced martensitic transformation within NiTi structures with uniform and nonuniform geometries. This article is related to the research paper entitled "Computational and experimental analyses of martensitic transformation propagation in shape memory alloys" [1]. T...
Article
Heusler-type ferromagnetic shape memory alloys possess attractive multifunctional properties, including magnetic field induced shape memory effect, magnetoresistance and magnetocaloric effect, owing to the unique concurrent magnetic and martensitic transformations. However, these intermetallics generally exhibit intrinsic high brittleness and low s...
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Ti50Ni50-xCux alloys are observed to exhibit multiple martensitic transformations from B2 to an orthorhombic B19 and a monoclinic B19' phase. In addition, DFT calculations have predicted a B19ʺ phase with a higher monoclinic angle as the thermodynamically stable ground state. This study investigated the effects of Cu content and shear stress on the...
Article
Measuring intrinsic macro stresses in fibre-textured thin films have always been challenging. Due to the nature of preferential orientation in these films, only d-spacings aligned with the film surface are observable in Bragg-Brentano X-ray diffraction scans, and to collect sufficient diffraction data needed for the stress calculation, a sample sta...
Article
This study investigates the creation of heterogeneous martensitic transformation field in shape memory alloy structures with geometrical nonuniformity through experiments and finite element computational analysis. Geometrically graded superelastic NiTi thin plates with series and parallel design configurations with respect to the loading direction...
Article
Self-compacting concrete (SCC) is the main cementitious material employed in modern constructions, because of its outstanding deformability and high resistance to segregation. In this study, a new nickel-titanium (NiTi) shape memory alloy (SMA) fibre was manufactured to investigate its effects on the fresh and mechanical properties of SMA fibre-rei...
Article
Proper alloying magnesium with element scandium (Sc) could transform its microstructure from α phase with hexagonal closed-packed (hcp) structure into β phase with body-cubic centered (bcc) structure. In the present work, the Mg-30 wt% Sc alloy with single α phase, dual phases (α + β) or β phase microstructure were developed by altering the heat-tr...
Article
The shape memory effect and pseudoelastic effect of NiTi shape memory alloys occur within respectively a narrow temperature and stress window associated with its martensitic transformation. This renders difficulty in accurate and reliable control for actuation applications using these properties. One approach to improving controllability of an actu...
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Full-text available
This study investigated a novel hypothesis on the influences of residual or pre-dislocation structures on creep life of Ni-based single crystal superalloys. Different types of anisotropic dislocation structures were created by pre-straining the samples at a relatively low temperature under different constant bias load conditions. After such pre-str...
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Topologically close-packed (TCP) phases in Ni-based single crystal superalloys are known to exhibit different morphologies and orientation relationships within the matrix. This study investigated the influence of chemical composition on lattice parameters, which in turn determine the interface lattice misfit between TCP phase and matrix and thus sh...
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Alveolar bone loss is a common problem that affects dental implant placement. A barrier between the bone substitute and gingiva that can prevent fibro-tissue ingrowth, bacterial infection and induce bone formation is a key factor in improving the success of alveolar ridge reconstruction. This study aims to develop a bioactive collagen barrier mater...
Article
Shape memory alloys exhibit unique thermomechanical properties, e.g., the shape memory effect and the pseudoelasticity. By proper geometrical gradient design, these alloys can be made to exhibit different and more intricate thermomechanical behaviour to enable innovative applications. This paper reports the design of geometrically gradient NiTi and...
Article
This study investigated the effect of thermally induced surface martensite layer on hydrogen embrittlement of Fe-16Mn-0.4C-2Mo (wt.%) (16Mn) and Fe-25Mn-0.4C-2Mo (wt.%) (25Mn) steels through slow strain rate stress corrosion cracking testing and proof ring testing in wet H2S environment. The 16Mn steel had a surface layer of less than 150 μm in dep...
Article
Much effort has been made to synthesize porous NiTi alloys using powder metallurgy techniques. However, the sintered products from elemental Ti and Ni powders often contain Ti2Ni and Ni3Ti in addition to the desired NiTi phase, and the thermal and mechanical properties of the sintered products are inferior comparing to cast or wrought NiTi alloys....
Article
Si1-xGex (0≤x≤1) thin films were deposited by means of biased target ion beam sputtering at a low substrate temperature near 100 °C inside a vacuum chamber. The as-deposited films were all found to be amorphous and to be compressively stressed, and the magnitude of the compressive stress was found to decrease with increasing Ge content. Heat treatm...
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Freestanding nanomaterials (such as nanowires, nanoribbons, and nanotubes) are known to exhibit ultralarge elastic strains and ultrahigh strengths. However, harnessing their superior intrinsic mechanical properties in bulk composites has proven to be difficult. A recent breakthrough has overcome this difficulty by using a martensitic phase transfor...
Article
The microstructure, thermal and mechanical stability of Ni-based single crystalline superalloys depend strongly on the alloying elements and their concentrations. Alloying has been the main design strategy for stabilizing the compositions, microstructures and thermal-mechanical properties. This article presents a review on the effects of some commo...
Article
Equiatomic NiTi shape memory alloys exhibit multiple martensitic transformations from a parent B2 phase. However, there is an apparent discrepancy between theoretical predictions and experimental observations of the transformation pathways and final products. We studied the phase stabilities of NiTi martensites with respect to the effect of hydrost...
Article
Multifunctional metal/oxide/metal core/multi-shell nanowire arrays were prepared mostly by physical or chemical vapor deposition. In our study, the Cu/CuO/Ni core/multi-shell nanowire arrays were prepared by AAO template-electrodeposition and oxidation processes. The Cu/Ni core/shell nanowire arrays were prepared by AAO template-electrodeposition m...
Article
The precipitation and growth morphology of topologically close-packed (TCP) phases in a Re-containing Ni-based single crystal superalloy during thermal exposure were studied. The alloy was found to develop acicular-shaped coherent μ phase particles along <110>γ directions of the matrix after exposure at 950 ºC. P phase precipitates were found to fo...
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Using state-of-the-art atomic scale super energy dispersive X-ray spectroscopy and high angle annular dark field imaging this study reveals the elemental partitioning preference between the γ′ and γ phases in a Co-Al-W-Ti-Ta superalloy and the site preference of its alloying elements in the ordered L12 γ′ phase. A semi-quantitative analysis of atom...
Article
Surface oxidation at elevated temperatures has been a phenomenon of interest for NiTi alloys. On one hand it has been deliberately used to provide a surface protective layer to prevent Ni release for biomedical applications, and on the other it is to be minimised in metal processing and production. This study investigated the use of flowing argon a...
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This paper reports a study of time-resolved deformation process at the atomic scale of a nanocrystalline Pt thin film captured in situ under a transmission electron microscope. The main mechanism of plastic deformation was found to evolve from full dislocation activity-enabled plasticity in large grains (with grain size d > 10 nm), to partial dislo...