ZheFeng Zhang

Chinese Academy of Sciences

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ZhengMing Sun

Southeast University

Toshihiko Abe

Ritsumeikan University

Hitoshi Hashimoto

Osaka University

Fuguan Cong

Northeastern University

QiQiang Duan

Chinese Academy of Sciences

B.S. Gong

Chinese Academy of Sciences

HanZhong Liu

Chinese Academy of Sciences

Xuegang Wang

University of Electronic Science and Technology of China

Zhenjun Zhang

Chinese Academy of Sciences

Jiapeng Hou

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology of China

National Institute of Advanced Industrial Science and Technology

University of Electronic Science and Technology of China

Karadeniz Technical University

Suzhou Institute of Nano-tech and Nano-bionics

Southeast University

Anhui University of Technology

State Key Laboratory of High Performance Civil Engineering Materials

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Ternary Compound Ti3SiC2: Part I. Pulse Discharge Sintering Synthesis

MATERIALS TRANSACTIONS (2002)

ZhengMing Sun ZheFeng Zhang Hitoshi Hashimoto Toshihiko Abe

Pulse discharge sintering (PDS) technique was employed to synthesize the ternary compound Ti3SiC2 from four starting powder mixtures. The experimental results demonstrated that when the starting material of 3Ti/Si/2C or 3Ti/SiC/C was used high content of the secondary phase, TiC, higher than 30 mass%, was found in the sintered material. When TiC powder as starting material was used (Ti/Si/2TiC) in the same stoichiometric composition, however, the final sintered product contained low TiC content of a few percent. Further adjusting the composition to the off-stoichiometric of 2Ti/2Si/3TiC, the content of the secondary phase TiC was further controlled to be around 1 mass%. In the materials sintered from Ti/Si/2TiC and 2Ti/2Si/3TiC an optimum sintering temperature exists at 1573 K, at which the highest Ti3SiC2 phase purity was achieved. When sintered at the optimum temperature a density of higher than 99% was obtained. At the optimum sintering temperature, both the phase purity and the density of the material sintered from 2Ti/2Si/3TiC showed very little dependence on the sintering time ranging from a few minutes to four hours, indicating the phase stability at this temperature.

Stoichiometry

Mass fraction

10.2320/matertrans.43.428

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Citations (76)

Synthesis of a Metallic Ceramic -Ti₃SiC₂ by PDS Process and its Properties

MRS Proceedings (2002)

ZhengMing Sun Hitoshi Hashimoto ZheFeng Zhang SongLang Yang Toshihiko Abe

Relative density

MAX phases

Machinability

Spark Plasma Sintering

10.1557/proc-755-dd6.4

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Citations (5)

Effect of Aging on Impact Toughness and Fracture Behavior of Three Wrought Aluminum Alloys

Advanced Engineering Materials (2023)

B.S. Gong Zhenjun Zhang QiQiang Duan Jiapeng Hou Ronghua Li

Herein, the effect of the aging state on the impact toughness of three typical wrought Al alloys (7075, 2024, and 6A01) is investigated. At room temperature, the fracture mode of the three aluminum alloys at different aging states is a ductile transgranular fracture. At low temperatures, high‐strength aluminum alloys exhibit a mixture fracture of transgranular and intergranular, while medium‐strength aluminum alloys are still dominated by transgranular fractures. The effect of the aging state on the impact toughness of aluminum alloys was analyzed based on the deformation mechanism and morphology near grain boundaries. The underaged state with planar slip dislocations exhibits good plasticity and work‐hardening ability, which reduces the strain localization caused by dislocation plugging and thus improves the impact toughness of the alloy. Furthermore, the fine grain boundary precipitates and the narrow precipitation‐free zone of the underaged increase the uniform deformation capacity near the grain boundaries and inhibit the initiation and propagation of cracks. Compared with high‐strength aluminum alloys, medium‐strength aluminum alloys exhibit higher impact toughness due to the formation of a larger plastic zone and shear lip area during impact.

Transgranular fracture

Precipitation hardening

10.1002/adem.202300033

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Ternary Compound Ti3SiC2: Part II. Deformation and Fracture Behavior at Different Temperatures

MATERIALS TRANSACTIONS (2002)

ZhengMing Sun ZheFeng Zhang Hitoshi Hashimoto Toshihiko Abe

Compressive tests were conducted in vacuum at temperatures up to 1203 K, on the Ti3SiC2 samples synthesized from 2Ti/2Si/3TiC powder mixture through pulse discharge sintering technique. The compressive strength of Ti3SiC2 compound showed a monotonic decrease with increasing testing temperature. The Ti3SiC2 samples displayed obvious brittle fracture behavior at temperatures below 1073 K. When the testing temperature was above 1123 K, obvious pseudo-plastic deformation behavior was observed in the stress-strain curves. At these temperatures, after an initial pseudo-strain-hardening, a decrease in stress follows with further increasing strain. The pseudo-plastic behavior of Ti3SiC2 at temperature above 1123 K could be attributed to the basal plane slip, kink-band formation, delamination of layers at local sites, and intergranular cracking. Further increase in strain causes the growth and linkage of microcracks, which gives rise to the reduction of the real area of the cross section of specimen and hence lead to the "strain-softening" phenomenon.

Brittleness

Strain hardening exponent

Hardening (computing)

10.2320/matertrans.43.432

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Citations (49)

Comparison on the Fatigue Crack Propagation of High‐Strength Aluminum Alloys

Advanced Engineering Materials (2023)

B.S. Gong Zhenjun Zhang QiQiang Duan Hongwei Wang Xuegang Wang

To investigate the fatigue crack propagation (FCP) behaviors of high‐strength 7075 and 2024 Al alloys, FCP experiments are conducted for the two alloys at different aging states (underaged [UA], peak aging, and overaged). It is found that strength and plasticity are the main factors influencing the FCP. For 7075 Al alloy, the FCP curves almost coincide for the three aging states that have similar tensile properties. However, 2024 Al alloy shows the lowest FCP rate at the UA state which has the strongest strength–plasticity match among the three aging stages. Based on the low‐cycle‐fatigue damage model, the effect of strength–plasticity balance on FCP rate of the two Al alloys at different aging states is quantitatively analyzed. It is found that the larger the strength–plasticity balance of the alloy, the smaller the FCP rate under the same stress intensity factor. This study indicates that the FCP rate of high‐strength Al alloys is mainly influenced by the strength–plasticity balance due to the difference in the aging states.

Fatigue limit

10.1002/adem.202301083

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Citations (2)