High strength, deformable nanotwinned Al-Co alloys

被引：32

作者：

Xue, S. ^{[1
]}

Li, Qiang ^{[1
]}

Xie, D. Y. ^{[2
]}

Zhang, Y. F. ^{[1
]}

Wang, Han ^{[1
]}

Wang, Haiyan ^{[1
]}

Wang, J. ^{[2
]}

Zhang, X. ^{[1
]}

机构：

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47906 USA

[2] Univ Nebraska, Nebraska Ctr Energy Sci Res, Lincoln, NE USA

来源：

MATERIALS RESEARCH LETTERS | 2019年 / 7卷 / 01期

关键词：

Twinned Al; growth twins; stacking fault energy; sputtering; HALL-PETCH RELATION; MECHANICAL-BEHAVIOR; NANOCRYSTALLINE AL; ALUMINUM; MICROSTRUCTURE; TEXTURE; TWINS;

D O I：

10.1080/21663831.2018.1552211

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Aluminum (Al) alloys have been widely used in the transportation industry. However, most high-strength Al alloys to date have limited mechanical strength, on the order of a few hundred MPa, which is much lower than the flow stress of high-strength steels. In this study, we show the fabrication of nanocrystalline Al alloys with high-density growth twins enabled by a few atomic percent of Co solute. In situ uniaxial compression tests show that the flow stress of Al-Co solid solution alloys exceeds 1.5GPa, while good work hardening capability is maintained. This study provides a new perspective on the design of high-strength Al alloys for various applications. [GRAPHICS] IMPACT STATEMENTThe flow stress of Al-Co alloys with high-density growth twins exceeds 1.5GPa, while maintaining good work hardening capability. The twins are stabilized by Co impurities based on DFT calculations.

引用

页码：33 / 39

页数：7

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