Enhancing grain refinement in polycrystalline materials using surface mechanical attrition treatment at cryogenic temperatures
Enhancing grain refinement in polycrystalline materials using surface mechanical attrition treatment at cryogenic temperatures
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DOI：
10.1016/j.scriptamat.2013.05.036
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发表时间：
2013-09
影响因子：
6
通讯作者：
K. Darling;M. Tschopp;A. Roberts;J. Ligda;L. Kecskes
中科院分区：
文献类型：
--
作者：
K. Darling;M. Tschopp;A. Roberts;J. Ligda;L. Kecskes
在低温和室温下对纯铜进行了表面机械研磨处理（SMAT）。低温SMAT工艺导致多晶显微组织中的晶粒尺寸比室温下减小60%。晶粒细化的水平与SMAT过程中的主要变形机制从室温下的位错介导行为到低温下的孪晶/剪切带介导行为的转变有关，这也有助于抑制热激活过程。
The surface mechanical attrition treatment (SMAT) process was applied to pure Cu at both cryogenic and room temperatures. The cryogenic SMAT process resulted in a 60% reduction of grain size in the polycrystalline microstructure compared to that at room temperature. The level of grain refinement is related to a transition in the dominant deformation mechanism during SMAT from a dislocation-mediated behavior at room temperature to a twinning/shear band-mediated behavior at cryogenic temperatures, which also helps to suppress thermally activated processes.