Feng Qiu

• PhD
• Professor at Jilin University

The increase in strength usually accompanies by the sacrifice of ductility in the composites. This work proposed a strategy of design and synthesis of in-situ TiB2 particles to effectively tailor the microstructures and to enhance the mechanical performance of Al–Si-based composites. The tuning mechanisms for size and morphology of TiB2 particles w...

As interfaces play a more important role in high-volume-fraction ceramic/metal composites because of containing more hetero-phase interfaces, it is a great challenge to control the interfaces in such composites to balance their strength and plasticity and to obtain high performances. In this work, 50–60 vol% (TiC + TiB2)/Al composites were fabricat...

In order to effectively reduce energy consumption and increase range mile, new energy vehicles represented by Tesla have greatly aroused the application of integrated magnesium (Mg) alloy die casting technology in automobiles. Previously, the application of Mg alloys in automobiles, especially in automotive cockpit components, is quite extensive, w...

Al-Mg alloys are widely used as important engineering structural materials in aerospace engineering, transportation systems, and structural constructions due to their low density, high specific strength, corrosion resistance, welding capability, fatigue strength, and cost-effectiveness. However, the conventional Al-Mg alloys can no longer fully sat...

Excellent wear properties can improve the service performance and service life of high‐Cr hot work die steels. Herein, an innovative method is proposed to introduce TiC nanoparticles into the matrix of high‐Cr hot work die steels, and the effects of TiC nanoparticles on the microstructure and wear resistance of high‐Cr hot work die steels are inves...

As an important part of die steels, hot-work die steels are mainly used to manufacture molds made of solid metal or high-temperature liquid metal from heating to recrystallization temperature. In view of the requirements for mechanical properties and service life for hot-work die steel, it is conducive to improve the thermal fatigue resistance, wea...

Magnesium matrix composites are essential lightweight metal matrix composites, following aluminum matrix composites, with outstanding application prospects in automotive, aerospace lightweight and biomedical materials because of their high specific strength, low density and specific stiffness, good casting performance and rich resources. However, t...

The intricate geometry and thin walls of the motor housing in new energy vehicles render it susceptible to casting defects during conventional casting processes. However, the lost-foam casting process holds a unique advantage in eliminating casting defects and ensuring the strength and air-tightness of thin-walled castings. In this paper, the lost-...

We employed a novel technique combining wire and powder co-delivery to fabricate a functionally gradient material (FGM) structure consisting of Al-based composites reinforced with alternating TiC and B4C particles. The TiC content increases from the bottom up and then decreases, while the B4C content gradually increases, resulting in a continuous g...

Lightweight NiAl alloys are expected to replace high-density nickel-based superalloys, but their mechanical performance needs to be improved. In this work, NiAl-30Cr composites with a novel heterogeneous micro-structure composed of fine NiAl matrix and Cr single-phase was successfully prepared. Nanoscale Cr particles with 15 nm in size precipitated...

The metal-based additive manufacturing (AM), also referred to as metal 3D printing, has drawn particular interest because it enables direct creation, aided by computationally-directed path design, of intricate components with site-specific compositions and geometrical requirements as well as low buy-to-fly ratios. During the last two decades, the o...

The lightweight aluminum (Al) alloys have been widely used in frontier fields like aerospace and automotive industries, which attracts great interest in additive manufacturing to process high-value Al parts. As a mainstream additive manufacturing technique, laser directed energy deposition (LDED) shows good scalability to meet requirements for larg...

Super304H steel, imbued with trace amounts of TiC/TiB2 nano-particles, was fabricated to assess the influence of nano-particles on its creep properties under the condition of 600 °C/330 MPa. Our findings elucidate that the inclusion of trace TiC/TiB2 led to a 21% improvement in the creep life of Super304H steel, while diminishing the creep rate fro...

In the general environment of lightweight automobiles, the integrated die-casting technology proposed by Tesla has become the general mode to better achieve weight reduction in automobiles. The die-casting mold required by integrated die-casting technology has the characteristics of large scale and complexity. Hence, higher requirements are put for...

Herein, to improve the service life of die steels, many methods are used to improve their properties. However, some properties may be weakened after different heat treatments. In this study, a novel method of nanoparticle treatment is used to improve the service performance of high‐Cr steel (HCS), and the effect of nano‐TiC ceramic particles on its...

Herein, nanoparticle‐reinforced carbon steels are innovatively prepared through the use of TiC‐TiB2/Al master alloys. The effects of nanoparticles on the microstructure and wear performance of carbon steels are investigated. It is found that the addition of nanoparticles inhibits the Widmanstatten structure. Also, the nanoparticles promote the form...

The current research studied the influence of TiC–TiB2 ceramic nanoparticles on the microstructure and wear properties of gray cast irons. The tribological performance of gray cast irons was evaluated on a universal mechanical tribometer with a ball-on-plate reciprocating sliding test rig. It was found that the addition of nanoparticles effectively...

It is well known that the development of lightweight alloys with improved comprehensive performance and application value are the future development directions for the ultra-high-strength 7xxx series Al-Zn-Mg-Cu alloys used in the aircraft field. As the lightest metal element in nature, lithium (Li) has outstanding advantages in reducing the densit...

Highlights The progress of advanced powder metallurgy techniques for manufacturing copper matrix composites and their advantages are reviewed. Influence mechanisms of ceramic particles on mechanical and thermophysical properties of composites are analyzed. The content, size, morphology and interfacial bonding of particles directly determine the com...

Most methods used to synthesize and prepare NiAl intermetallics and their alloys have the disadvantages of complexity and high cost. In this paper, the NiAl alloy was prepared by a Combustion Synthesis and Hot Pressing (CSHP) technique under rapid solidification. The grain size of the NiAl alloy is significantly refined to 60–80 μm, which reduces t...

Hot-work die steel with excellent strength and toughness can improve the precision of the die and prolong its service life. However, this is very difficult to achieve because of the opposing relationship between strength and plasticity. In this paper, we propose a combined approach of composition design and nanoparticle modification to overcome thi...

The optimal design of microstructure is the key to further improve the properties of particle reinforced metal matrix composites. In this study, in-situ TiB2 and TiC + TiB2 reinforced Cu matrix composites are used as examples to develop the microstructure-based representative volume element models to describe their damage evolution and strengthenin...

Center segregation during the twin-roll casting (TRC) has always been a barrier to the fabrication of high-performance Al–Mg–Si strips. In this work, Al–Mg–Si alloys with different Mg and Si contents were fabricated by vertical-type twin-roll caster to investigate the effect of Mg and Si contents on central segregation susceptibility. Alloys that u...

A strong interface and microstructure design is the key to the development of the ceramics/Al composites with high strength-ductility synergy. This work aims to manipulate the interface bonding and microstructure via tuning interfacial reactions. The 70 vol% TiC/Al cermets with different Ti/C molar ratios were produced by the reaction hot pressing...

Forging and welding are common necessary procedures for AA6××× alloys, and recrystallization is an inevitable process. However, it is still difficult to realize the control of the recrystallization behavior, while realizing the strengthening of mechanical properties of the base metal and welded joint. In this study, we overcome this problem through...

The experimental determination of surface free energy is of great importance for engineering applications. However, there is no universal, reliable, and convenient measurement means to achieve experimental determination of solid surface energy for high-energy surface. In this work, the existing techniques for experimental determination of surface e...

The present study investigated the microstructure and wear properties of annealed carbon steels with the addition of TiC–TiB2 ceramic nanoparticles. It was found that the presence of 0.02 wt% nanoparticles could decrease the amount of widmanstatten structure, promote the formation of finer pearlite from 33.0% to 46.3% and refine the grains from 67....

The purpose of this work is to prepare nano-TiCp reinforced Al–13Si–5Cu–2Ni matrix composites by self-propagating high-temperature synthesis (SHS). To study the changes in microstructure and mechanical properties, and summarize the strengthening mechanism. The results show that when nano-TiCp is added, it can significantly improve the nucleation ra...

Al–Zn–Mg–Cu alloys that are prone to segregation and hot cracks always encounter difficulty in manufacturing large-size workpiece with desirable strength-plasticity synergy, especially when the tonnage of the extruder exceeds 6000 tons. This work puts forward a novel idea to address this challenge by joining extruded profiles of Al–Zn–Mg–Cu-based c...

Simultaneously improving the wear resistance and toughness can extend the service life of steel. In this study, nano-TiC-H13 steel was successfully fabricated by pre-dispersion nano-TiC/Al master alloy in conventional casting to simultaneously improve the wear resistance and toughness. The influence of nano-TiC ceramic particles on the microstructu...

Few studies have been conducted to investigate the wear resistance of nanoparticle-reinforced graphite ductile irons. In this research, graphite ductile irons with a trace amount of TiC-TiB2 nanoparticles are fabricated. The influences of nanoparticles on the microstructure and wear properties of as-cast graphite ductile irons are studied. It is fo...

The use of nanoparticles to efficiently manipulate the microstructure of steel and improve its mechanical properties has considerable practical relevance and application value. This study proposes the novel manufacturing process of dispersing nanoparticles within the melt through master alloys and investigates the effect on the microstructure and p...

In this paper, the stainless steel laser welding defect weld with 1 mm+0.6 mm plate thickness combination is taken as the research object, and a new laser secondary remelting repair technology is developed. The technique can effectively repair the surface collapse defect in laser weld. At the same time, due of the recrystallization of laser seconda...

Lightweight materials design of friction parts promises aluminum matrix composites to achieve comparable anti-wear properties as steel. However, it is still challenging due to the limited effects of monotonous reinforcement. In this work, (TiB2-TiC)/Al-Cu-Mg composites were fabricated with particle content from 10 to 60 vol% and scaled from nano-si...

TiAl alloys exhibit significant properties, such as low density and high specific strength, and can successfully meet the requirements of weight reduction in aviation applications. However, insufficient strength, especially at high temperatures, has always been challenging. To overcome this issue, a 4 vol.% TiB2/TiAl-x at.% V composite was successf...

Innovative in-situ synthesis tactics of devising Al-Cu4/Al-Mg1 alloy inoculated with Fe80-B11-Si9 (at.%) metallic glasses were proposed to achieve comprehensive multiscale inoculation of the microstructure. The effects of inoculant on the solidification behaviors were studied, and calculated the mismatch between α-Al and Fe2B/Fe3Si according to the...

Incident Ti–Si poisoning when applying traditional agents of microstructure manipulation in Al–Si alloys is always adverse to realize multilevel microstructure control. This work combined the manipulation by physically formed in-situ nano-ceramics from Fe79.58B11.26Si9.26 amorphous alloy and the micro-alloying to comprehensively improve the microst...

In aluminum alloys, the most often utilized cast Al-Si alloy system, the microstructure often needs to be improved by modification and inoculation treatment. This study comprehensively examines the impact of nanocrystals produced by Fe-B-Si amorphous alloys on the solidification behavior and microstructure of hypoeutectic Al-Si7 alloy and hypereute...

It remains challenging to incorporate high-content fibers in fiber-reinforced polymer matrix composites to significantly enhance their mechanical properties. This work prepared polyether ether ketone (PEEK) matrix composite reinforced with 66 wt.% carbon fibers with 0°/90° prepreg layer by compression molding, with aim to further increase the carbo...

Adding alloying elements to increase precipitation is a common method to strengthen aluminum (Al) alloys, but an excessively high alloying element content causes segregation and a reduction in plasticity. In this work, the tradeoff between alloying element content and segregation was explored along with the simultaneous increase in precipitation an...

It is challenging to concurrently control the microstructure evolutions after undergoing casting, sheet forming and welding. This study successfully addressed this challenge via trace TiC–TiB2 nanoparticles in the amelioration of solidification-rolling-welding microstructural evolution. Nanoparticles refined the solidified microstructures and signi...

The present research utilized the resistance spot welding process on stainless steel and low carbon steel. The diameters of joint and nugget, microstructure and shearing strength of joints were examined. When increasing the welding current, welding time or clamping force, the diameters of welding joints and nuggets became larger due to the higher h...

The size, distribution, and morphology of TiC particle in Fe–Ti–C system have a great influence on the mechanical properties of TiC/Fe composites. In this work, TiC/Fe composites were fabricated in the Fe–Ti–C system with different carbon source and molar ratio by combustion synthesis and hot-pressing method. Morphology and size of ceramic particle...

The increase of strength in composites usually comes at the cost of ductility. This work proposed a strategy of design and synthesis of TiCx nanoparticles with controlled Ti/C stoichiometric ratios to adjust the microstructure and thus to enhance the mechanical properties of the TiCx nanoparticles reinforced iron matrix composites. The changes of s...

In this work, two types of Al-Mg-Si strips with different Mg/Si ratios were fabricated by vertical-type twin-roll casting (TRC), and the effect of the Mg/Si ratio on microstructure and tensile properties of the TRC strips was investigated. The TRC strips show the heterogeneous structure, composed of columnar dendrites near the surface of both sides...

TiAl composites reinforced with 4 vol% nanometer-sized TiB2 particles and different contents of Cr were successfully prepared using fast hot pressing sintering. This process led to the simultaneous realization of in situ nanometer-sized TiB2 particle generation, a Cr solid solution, and the densification of the composite in one step. The nanometer-...

The current research studied the microstructure and mechanical properties of low carbon steels reinforced by a trace amount of TiC-TiB2 nanoparticles. An innovative method was proposed to introduce the nanoparticles into molten iron through the use of an aluminum master alloy. It was found that the addition of nanoparticles refined the grains and l...

In this study, an innovative method, wherein trace in situ synthesized nano-(TiC+TiB 2) particles are added forged H13 steel, was designed and used to manipulate its microstructure. This refined the grains and laths martensite, increased the retained austenite and carbides, and controlled the carbide segregation. Thus, the strength, plasticity, and...

The aim of this study is to investigate the tribological behavior of disks made of AISI5160 steel that were austempered at 288 °C for 120 min until the bainite microstructure was completely formed. Then shot peening was applied for 0 (not shot peened), 1, 2, 3, 4, or 5 min. Before tribotests, x-ray diffraction (XRD) was employed to measure the comp...

The kinetic factors of the liquid–solid interface formation process are extremely useful in the design of composite preparation methods and the manufacture of comprehensive performance-controlled metal- or ceramic-based composites. Here, we review the available spreading dynamic models, focusing on wetting at high temperatures. There is yet to be d...

The MgZn1.2Zr0.35 (wt%) alloys for orthopedic applications enhanced by small amount addition of zirconium and subsequent hot extrusion working based on cast MgZn1.2 system were successfully fabricated. As 0.35% zirconium (Zr) added, the mean grain sizes of as-cast MgZn1.2 alloys were found to decrease from 107μm to 72μm attributed to the Zr element...

The 50 vol% TiB2/Al composites with different alloying elements (Cu and Zn) were prepared by hot pressing sintering. The effects of Zn and Cu on the micromorphology of TiB2 ceramic particles and interfacial behavior between TiB2 ceramic and Al matrix as well as the mechanical properties of composites were investigated. Results indicated that the ad...

Tuning solidification microstructure remains a grand challenge for ceramic particles reinforced Al-Si based composites due to adverse interactions between ceramic particles and Si-containing melts. This work proposed a novel in-situ synthesis strategy of designing master alloys decorated with well-dispersed TiCxNy and TiB2 particles to synergistica...

In this paper, 50 vol.% (TiC + TiB2)/Al composites with different alloy elements (Mg, Zn) were prepared by combustion synthesis and hot-pressing method. The effects of Mg and Zn on the microstructure and mechanical properties of the composites were investigated. TiC and TiB2 particles in the composite were refined by the addition of Mg to a certain...

Nanoparticles acting as additives to improve the tribological performance of base fluids have attracted much attention in the last several decades to lower wear loss, reduce the frictional force, enhance the service performance and extend the service life of sliding components. Different nanoparticles with various concentrations, mixing methodologi...

Reinforced vermicular graphite cast irons were prepared by using aluminum precursor master alloy containing TiC-TiB2 nanoparticles. It was found that the vermicularity and amount of graphite increased by 15.0% and 16.6%, and grain size decreased by 32.9%. The yield strength, tensile strength and elongation were improved by 10.0%, 6.0% and 26.3% at...