Achieving Large-area Bulk Ultrafne Grained Cu via Submerged Multiple-pass Friction Stir Processing
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第12期
论文作者：P.Xue B.L.Xiao Z.Y.Ma
文章页码：1111 - 1115
摘 要：Large-area bulk ultrafine grained （UFG） pure Cu was successfully prepared by multiple-pass overlapping friction stir processing（FSP） under additional rapid cooling.Overlapping FSP did not exert a significant effect on the microstructure and mechanical properties of the FSP UFG Cu.Similar average grain size was achieved in the transitional zone（TZ） of the multiple-pass FSP sample compared to that in the nugget zone of the single-pass FSP sample,and the TZ exhibited a strong{111}〈112〉type A fiber shear texture.Very weak softening occurred in the TZ of the multiple-pass FSP UFG Cu,resulting in a relatively uniform hardness distribution throughout the whole processed zone.A high yield strength of w310 MPa and a uniform elongation of w13%were achieved in the bulk FSP UFG Cu.This study provides an effective strategy to prepare large-area bulk UFG materials.
P.Xue，B.L.Xiao，Z.Y.Ma
Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences
摘 要：Large-area bulk ultrafine grained （UFG） pure Cu was successfully prepared by multiple-pass overlapping friction stir processing（FSP） under additional rapid cooling.Overlapping FSP did not exert a significant effect on the microstructure and mechanical properties of the FSP UFG Cu.Similar average grain size was achieved in the transitional zone（TZ） of the multiple-pass FSP sample compared to that in the nugget zone of the single-pass FSP sample,and the TZ exhibited a strong{111}〈112〉type A fiber shear texture.Very weak softening occurred in the TZ of the multiple-pass FSP UFG Cu,resulting in a relatively uniform hardness distribution throughout the whole processed zone.A high yield strength of w310 MPa and a uniform elongation of w13%were achieved in the bulk FSP UFG Cu.This study provides an effective strategy to prepare large-area bulk UFG materials.
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