Effect of stacking fault energy on deformation mechanisms in Cu and Cu-30% Zn alloy with gradient structure obtained by SMAT
Effect of stacking fault energy on deformation mechanisms in Cu and Cu-30% Zn alloy with gradient structure obtained by SMAT
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DOI：
10.1016/j.jallcom.2021.158863
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发表时间：
2021-01-30
影响因子：
6.2
通讯作者：
Zhu, Xinkun
中科院分区：
文献类型：
--
作者：
Liu, Xiaomin;Nakatani, Masashi;Zhu, Xinkun
初步研究了低堆垛层错能（SFE）的纯铜和铜锌合金的变形机制和力学性能。本文在低温下对纯铜和 Cu-30%Zn 样品进行了表面机械磨损处理 (SMAT)。结果表明，通过室温拉伸试验，Cu-30%Zn样品表现出更高的屈服强度和更好的塑性。在相同的 SMAT 加工时间下，与 SMAT 处理的 Cu 样品相比，SMAT 处理的 Cu-30%Zn 样品表现出强度和延展性的优化组合。原位电子背散射衍射（EBSD）测试表明，低SFE的SMAT处理的Cu-30%Zn样品中存在高密度的几何必要位错（GND），从而形成强烈的异质形变诱导（HDI）应力强化和HDI硬化。此外，孪晶促进了几何必要位错的积累，以增强强度，同时保持 Cu - 30%Zn 样品良好的延展性。 (C) 2021 Elsevier B.V. 保留所有权利。
The deformation mechanism and mechanical properties of pure copper and copper-zinc alloys with low stacking fault energy (SFE) were investigated primarily. In this paper, pure Cu and Cu-30%Zn samples were processed by surface mechanical attrition treatment (SMAT) at cryogenic temperature. The results show that Cu-30%Zn samples exhibit higher yield strength and better ductility by tensile tests at room temperature. With the same processing time of SMAT, the SMAT-ed Cu-30%Zn samples exhibit an optimized combination of strength and ductility compared with that of the SMAT-ed Cu samples. The in-situ electron backscatter diffraction (EBSD) tests show that there is a high density of geometrically necessary dislocations (GNDs) in SMAT-ed Cu-30%Zn samples with low SFE, thereby forming a strong hetero-deformation induced (HDI) stress strengthening and HDI hardening. Also, the twins promote the accumulation of geometrically necessary dislocations to enhance strength while maintaining good ductility in the Cu - 30%Zn samples. (C) 2021 Elsevier B.V. All rights reserved.