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Effect of thermomechanical processing on microstructure and mechanical properties of CoCrFeNiMn high entropy alloy

Transactions of Nonferrous Metals Society of China 2018年第5期28卷 931-938页

作者： Jian-xin FU Cheng-ming CAO Wei TONG Liang-ming PENG CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modem Mechanics School of Engineering Science University of Science and Technology of China Hefei 230027 China

The CoCrFeNiMn high entropy alloy was produced by homogenization, cold rolling and recrystallization. The effects of thermomechanical processing on microstructures and tensile properties at different temperatures were investigated using X-ray diffractometry（XRD）, optical microscopy（OM）, scanning electron microscopy（SEM） and multi-functional testing machine. The results show that dendritic structures in cast alloy evolve into equiaxed grains after being recrystallized, with single face-centered cubic（FCC） phase detected. The most refined alloys, stemming from the highest rolling ratio（40%）, exhibit the highest strength due to the grain boundary strengthening, while the variation of elongation with temperature shows a concave feature. For the coarse-grained alloys, both the ductility and work hardening ability decrease monotonically with increasing temperature. Serrated flow observed at intermediate temperatures is attributed to the effective pinning of dislocations, which manifests the occurrence of dynamic strain hardening and results in the deterioration in ductility. Besides, dimples on the fracture surfaces indicate the typical ductile rupture mode.

关键词： high entropy alloy cold rolling microstzucture tensile properties serrated flow

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Effect of three-step homogenization on microstructure and properties of 7N01 aluminum alloys

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Transactions of Nonferrous Metals Society of China 2018年第5期28卷 829-838页

作者： Hua-qiang LIN Ling-ying YE Lin SUN Tao XIAO Sheng-dan LIU Yun-lai DENG Xin-ming ZHANG National Engineering Research Center for High-Speed EMU CRRC Qingdao Sifang Co. Ltd. Qingdao 266000 China School of Materials Science and Engineering Central South University Changsha 410083 China Light Alloy Research Institute Central South University Changsha 410083 China

The effect of different homogenization treatments on the microstructure and properties of the 7N01 aluminum alloy was investigated using hardness measurements, electrical conductivity measurements, tensile and slow strain rate tests, electron probe microanalysis, optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results revealed that three-step homogenization improved the uniformity of Zr distribution by eliminating segregation of the main alloying elements. During the second homogenization step at 350 °C for 10 h, coarse and strip-like equilibrium η phases formed which assisted the nucleation of Al3Zr dispersoids and reduced the width of the precipitate-free zone of A13Zr dispersoids. As a result, coarse recrystallization was greatly reduced after homogenization at 200 °C, 2 h ＋ 350 °C, 10 h ＋ 470 °C, 12 h, which contributed to improving the overall properties of the 7N01 aluminum alloys.

关键词： 7N01 aluminum alloy three-step homogenization microstzucture mechanical properties stress corrosion cracking

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