Chang Liu

Chang Liu
Max Planck Institute for Iron Research GmbH | MPIE · Department of Microstructure Physics and Alloy Design

PhD

About

32
Publications
12,509
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350
Citations
Citations since 2016
31 Research Items
344 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150

Publications

Publications (32)
Article
Full-text available
Platinum-based catalysts are widely used in hydrogen evolution reactions; however, their applications are restricted because of the cost-efficiency trade-off. Here, we present a thermodynamics-based design strategy for synthesizing an Al 73 Mn 7 Ru 20 (atomic %) metal catalyst via combinatorial magnetron co-sputtering. The new electrocatalyst is co...
Article
Full-text available
Interstitials, e.g., C, N, and O, are attractive alloying elements as small atoms on interstitial sites create strong lattice distortions and hence substantially strengthen metals. However, brittle ceramics such as oxides and carbides usually form, instead of solid solutions, when the interstitial content exceeds a critical yet low value (e.g., 2 a...
Article
Full-text available
The design of high performance structural materials is always pursuing combinations of excellent yet often mutually exclusive properties such as mechanical strength, ductility and thermal stability. Although crystal-glass composite alloys provide better ductility compared to fully amorphous alloys, their thermal stability is poor, due to heterogene...
Article
Full-text available
Wear-related energy and material loss cost over 2500 Billion Euro per year. Traditional wisdom suggests that high-strength materials reveal low wear rates, yet, their plastic deformation mechanisms also influence their wear performance. High strength and homogeneous deformation behavior, which allow accommodating plastic strain without cracking or...
Article
The mechanical behavior and deformation mechanisms of a body-centered cubic (BCC) Ti29Zr24Nb23Hf24 (at.%) high entropy alloy (HEA) was investigated in temperatures and strain rates from 700 to 1100 °C and 10⁻³ to 10 s⁻¹, respectively. The HEA exhibits a substantial increase in yield stress with increasing strain rate. The strain rate sensitivity (S...
Article
Full-text available
Dual-phase metallic glasses (DP-MGs), a special member of the MGs family, often reveal unusual strength and ductility, yet, their corrosion behaviors are not understood. Here, we developed a nanostructured Mg57Zn36Ca7 (at.%) DP-MG and uncovered its corrosion mechanism in simulated body fluid (SBF) at the near-atomic scale utilizing transmission ele...
Article
Full-text available
Since its first emergence in 2004, the high-entropy alloy (HEA) concept has aimed at stabilizing single-or dual-phase multi-element solid solutions through high mixing entropy. Here, this strategy is changed and renders such massive solid solutions metastable, to trigger spinodal decomposition for improving the alloys' magnetic properties. The moti...
Article
The corrosion resistance of the equiatomic CoCrNi medium-entropy alloy (MEA) and its 0.5 atomic % nitrogen alloyed variant in 0.1 M H2SO4 solution was investigated and compared with that of the 316L stainless steel as a reference material. All of the investigated materials showed single-phase face centered cubic (FCC) microstructures, and nitrogen...
Preprint
Full-text available
We investigate the strain-rate-dependent mechanical behavior and deformation mechanisms of a refractory high entropy alloy, Ti29Zr24Nb23Hf24 (at.%), with a single-phase body-centered cubic (BCC) structure. High-temperature compression tests were conducted at temperatures from 700 to 1100{\deg}C at strain rates ranging from 10-3 to 10 s-1. A sudden...
Article
Full-text available
We report a room temperature ultrahigh yield strength (3.0 GPa in compression) and large deformability (above 50% compressive strain) of a magnesium-based nano-dual-phase glass-crystal alloy in sub-micro size, compared with brittle nature of its own structural units. Transmission electron microscope investigation, molecular dynamic simulation and c...
Article
Full-text available
Magnesium (Mg) alloys are good candidates for applications with requirement of energy saving, taking advantage of their low density. However, the fewer slip systems of the hexagonal-close-packed (hcp) structure restrict ductility of Mg alloys. Here, a hybrid nanostructure concept is presented by combining nano-dual-phase metallic glass (NDP-MG) and...
Article
Full-text available
High‐entropy alloys (HEAs) and metallic glasses (MGs) are two material classes based on the massive mixing of multiple‐principal elements. HEAs are single or multiphase crystalline solid solutions with high ductility. MGs with amorphous structure have superior strength but usually poor ductility. Here, the stacking fault energy in the high‐entropy...
Article
Full-text available
We report an excellent tensile property of the Mg-based nano-dual-phase glass-crystal alloy in sub-micro size. It shows room temperature large ductility (>50% true strain, resulted from the localized necking deformation) with ultrahigh tensile strength (2.4 GPa), compared with 1.4 GPa strength and limited ductility of its metallic glass counterpart...
Article
Full-text available
Selective oxidation of Fe2MnxSi alloys with various Si contents annealed in a gas mixture of H2/H2O (p(O2) = 6.5×10⁻²⁵ bar at 700 °C) for 2 h was investigated. The oxidation kinetics of all the alloys followed linear growth, indicating that most likely oxygen uptake was the rate-determining step. The addition of Si into Fe2Mn eliminated the formati...
Article
Full-text available
High strength and high ductility are often mutually exclusive properties for structural metallic materials. This is particularly important for aluminum (Al)-based alloys which are widely commercially employed. Here, we introduce a hierarchical nanostructured Al alloy with a structure of Al nanograins surrounded by nano-sized metallic glass (MG) she...
Article
A magnesium-based ‘supra-nanometre-sized dual-phase glass-crystal’ (SNDP-GC) coating had been fabricated on AZ31 alloy by magnetron sputtering. Surface mechanical attrition treatment (SMAT) was also introduced to form a gradient structure in order to reduce the hardness mismatch between Mg-based SNDP-GC coating and substrate. Microstructure, mechan...
Article
Ceramics are widely used as engineering materials due to their high strength; however, their lack of plasticity is a major drawback. We report that dual-phase amorphous carbon (a-C) reveals high yield strength of ∼E/11 (E is elastic modulus, and E/10 is theoretical limit for ideal material) and large plasticity of ∼70% at room temperature in uniaxi...
Article
The CoCrMo alloy was ion implanted by carbon with implantation fluences from 1.0 × 10¹⁷ to 9.0 × 10¹⁷ ions/cm². The nanostructure and phase transformation in CoCrMo alloy due to carbon ion implantation were investigated using high-resolution transmission electron microscopy (HRTEM). The tribocorrosion behavior was investigated by using a ball-on-di...

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Projects (3)
Project
The FORGE project (H2020-958457) has been specified as necessary by our energy intensive industrial members, who, in order to intensify and update their future processes, need to improve equipment capability to withstand corrosion, erosion and brittle failures from gas collection and kiln operations, to maintain the equipment’s up-time and production efficiency. Current materials used in these exceptionally harsh environments, (and the corresponding design models) are not capable of robustly resisting degradation, leading to the constant need to inspect and repair damage. The FORGE project will train a machine-learning model to guide high-throughput experiments, to develop novel high performance coatings of targeted “Compositionally Complex Alloys" and Ceramic counterparts, to be applied to the key specified vulnerable process stages (eg CO2 capture and waste heat recovery pipework, heat exchangers, kiln refractories) in response to the specific degradation forces we find at each point. We will also capture the underlying principles of the material resistance, to proactively design the equipment for performance while minimising overall capex costs from these new alloys. The FORGE consortium has industrial user members from steel, cement, aluminium and ceramic industries and specialist materials, to ensure the project's focus on real-world issues, coupled with world leading experience in the development of materials, protective coatings and their application to harsh environments. In addition to developing the new coating materials and techniques, we also aim to provide a new overarching set of design paradigms and generate an underpinning Knowledge Based System to inform this and future work in other energy intensive industries
Project
Anti-corrosion property of alloy
Project
High strength and high plasticity