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Recent Achievements in Developing Low Temperature and High Strain Rate Superplastic Materials

Journal of Materials Science & Technology 2001年第1期17卷 19-20页

作者： J.C Huang Inst.Materials Science and Engineering Sun Yat-Son UniversityKaohsiungTaiwan 804China

This paper is to briefly outline our recent activities in developing low temperature or high strain rate superplastic materials, including aircraft-used and general-purpose Al- and Mg-base alloys or composites. as well as Ti3AI base intermetallic alloys. The processing routes applied included the thermomechanical treatment, equal channel angular pressing and other extrusion or forging methods.

关键词： High Strain Rate thermomechanical treatment intermetallic alloys processing routes high strain rate low temperature

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Highly dispersed L1_(2)-Pt_(3)Fe intermetallic particles supported on single atom Fe-N_(x)-C_(y)active sites for enhanced activity and durability towards oxygen reduction

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Chinese Chemical Letters 2023年第5期34卷 343-347页

作者： Tuo Zhao Yang Li Jie Liu Xian Wang Jiayi Zhang Changpeng Liu Wei Xing Junjie Ge State Key Laboratory of Electroanalytical Chemistry Jilin Province Key Laboratory of Low Carbon Chemical PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Fuyuan British American School Shenzhen 518126China

Highly active and durable oxygen reduction reaction(ORR)catalysts with sufficient activity and stability of Pt are beneficial for the commercialization of proton exchange membrane fuel *** we report an effective approach to prepare a composite catalyst comprising of ordered L1_(2)-Pt_(3)Fe intermetallic nanoparticles interact with single atom Fe-N_(x)-C_(y)active *** addition of Fe and the confinement effect of hierarchical porous structure limit the growth of intermetallic particle size(around2.5 nm).The ligand effect of the electron transfer from Fe to Pt and the synergistic interaction between L1_(2)-Pt_(3)Fe and Fe-N_(x)-C_(y)work together to reduce oxygen intermediates adsorption and improve kinetics ***,the L1_(2)-Pt_(3)Fe/C_(Fe-N-C)catalyst shows high mass activity and specific activity at 1.010 A/mg_(Pt)and 1.166 mA/cm^(2),respectively,which are 5.8 and 5.1 times higher than those of commercial Pt/C(0.174 A/mg_(Pt)and 0.230mA/cm^(2)).Thanks to the more stable L1_(2)structure,L1_(2)-Pt_(3)Fe/C_(Fe-N-C)exhibits better durability(14mV E_(1/2)loss of L1_(2)-Pt_(3)Fe/C_(Fe-N-C)and 33 mV E_(1/2)loss of commercial Pt/C)after 30,000 cycles accelerated stress *** strategy to design and prepare small particle Pt-based intermetallic alloys coordinated with M-N-C active sites provides a new direction to obtain low-cost and easily prepared effective ORR catalysts.

关键词： intermetallic alloys Single atom active sites ORR Synergistic effect Confinement effect

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R&D STATUS ON intermetallicS IN CHINA

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 235-244页

作者： CHEN Guoliang(State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083, China)SHI Changxu (Academia Sinica, Beijing 100864, China)

This paper briefiy introduces the R&D of intermetallics in China. R&D on intermetallics in a national scale in China began near ten years ago. The investigation in past years focused on the fundamental research and materials development. A significant progress has been made. Various components that made of Ti3Al Ni3Al, TiAl and Fe3Al have been successfully manufactured Some of them have been evaluted. It is expected that some intermetallic alloys will be produced in an industrial scale in the near future.

关键词： intermetallic alloys high temperature materials orderedcompound R&D in China

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