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Enhancing the Ag Precipitation by Surface Mechanical Attrition Treatment on Cu-Ag Alloys
Jiabin Liu,Lehao Zhang,Jingjing Liu,Liuyi Huang,Hao Gu,Youtong Fang,Liang Meng,Jian Zhang 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
The influence of surface mechanical attrition treatment (SMAT) on Ag precipitation in Cu-Ag alloys was investigated. Cu-6 wt% Ag was melt, cold rolled and solution treated to be Cu-Ag solid solution, which was either aged at 250 and 350 °C for 24 h directly or SMAT-ed before aging. Ag precipitates were hard be found in the directly aged Cu-Ag sample while they were observed clearly in the SMAT-ed counterpart at 250 °C. The Ag precipitates formed in the surface layer by SMAT are much coarser than those in the un-SMAT-ed sample. It is obvious that the precipitating behavior of Ag was promoted significantly by SMAT approach. A large number of defects were generated by SMAT and they were acting as fast atomic diffusion channels that facilitated the atomic diffusion of Ag.