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A grain-size-dependent structure evolution in gradient-structured(GS) Ni under tension

查看全文 作　　者：Yan [1]Lin;Jie [1]Pan;Zhaoping [1]Luo;Yunli [1,2]Lu;Ke [1]Lu;Yi [1]Li 高影响力作者 机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China;[2]School of Materials Science and Engineering,University of Science and Technology of Chin1,Hefei,230026,China高影响力机构 出　　处：《Nano Materials Science》索引2020年第2卷第1期,共11页高影响力期刊 基　　金：financial support received from the National Key Research and Development Program of China(Grant no.2017YFB0702003);the National Natural Science Foundation of China(Grant no.51471165). 摘　　要：This work outlines an experimental investigation of grain-size-dependent structure evolution under tension in nickel with a grain size gradient.Two opposite and competing processes,grain refinement and coarsening,were examined within one specimen,due to the widely ranging grain size in gradient-structured(GS)Ni.A tensioninduced minimum grain size of approximately 280 nm was determined in GS Ni,which is comparable to those obtained by severe plastic deformation processes.The minimum grain size was phenomenologically explained using a dislocation model.Below the minimum grain size,the Ni’s grain coarsening ability peaked at approximately 50 nm and progressively decreased with decreasing grain size,showing an inverse grain-size-dependent coarsening tendency.Moreover,this inverse grain coarsening behavior was related to a transition in the deformation mechanism,through which the deformation process was accommodated more by partial dislocation than by full dislocation below a critical grain size.This was confirmed by observation of the microstructure and low temperature tensile testing results.This work demonstrates a high-throughput strategy for exploring the minimum grain size and grain-size-dependent coarsening in metals. 关 键 词：GRAIN SIZE GRADIENT Minimum GRAIN SIZE Grain-size-dependent COARSENING GRAIN deformation mechanisms
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