Cryogenic ultrahigh strain rate deformation induced hybrid nanotwinned microstructure for high strength and high ductility

被引：36

作者：

Ye, Chang ^{[1
]}

Suslov, Sergey ^{[2
]}

Lin, Dong ^{[1
]}

Liao, Yiliang ^{[1
]}

Cheng, Gary J. ^{[1
]}

机构：

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

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

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 21期

关键词：

NANO-SCALE TWINS; CENTERED-CUBIC METALS; DYNAMIC PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; RATE SENSITIVITY; NANOCRYSTALLINE MATERIALS; NANOSTRUCTURED METAL; TENSILE DUCTILITY; MAXIMUM STRENGTH; COPPER;

D O I：

10.1063/1.4881555

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Nanocrystalline metallic materials prepared by severe plastic deformation often possess high strength but low ductility due to the low dislocation accumulation capacity of the nanograins. Here, we report a unique process, namely, cryogenic laser shock peening (CLSP), to generate gradient nanotwinned microstructure that leads to high strength while preserving the ductility. It was observed that gradient structure was generated in copper. Near the top surface, nanocrystalline with high dense nanotwins have been observed; with the depth increasing, the fraction of the twin boundaries reduces and more heavily dislocated subgrains are observed. It has been demonstrated that CLSP can significantly improve material strength while preserving the ductility. The mechanism of the formation of gradient microstructure and high dense nanotwins near the surface was discussed. The reason behind the improvement in strength and ductility was investigated. (C) 2014 AIP Publishing LLC.

引用

页数：6

共 54 条

[1] An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening [J].