Tailoring stacking fault energy for high ductility and high strength in ultrafine grained Cu and its alloy

  title={Tailoring stacking fault energy for high ductility and high strength in ultrafine grained Cu and its alloy},
  author={Yonghao Zhao and Yuntian Zhu and Xiaozhou Liao and Zenji Horita and Terence G. Langdon},
  journal={Applied Physics Letters},
Bulk ultrafine grained (UFG) materials produced by severe plastic deformation often have low ductility. Here the authors report that simultaneous increases in ductility and strength can be achieved by tailoring the stacking fault energy (SFE) via alloying. Specifically, UFG bronze (Cu 10wt.% Zn) with a SFE of 35mJ∕m2 was found to have much higher strength and ductility than UFG copper with a SFE of 78mJ∕m2. Accumulations of both twins and dislocations during tensile testing play a significant… Expand

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