Effect of Volume Ratio of Gradient-structured Layer to Matrix Layer on Mechanical Properties of Mg-Gd-Y Alloy AITranslate

2Jiang-Li Ning,Bo Xu,Yun-Li Feng,Xu-Dong Li,Xin-Kang Li,Wei-Ping Tong.Tension-Compression Yield Asymmetry Influenced by the Variable Deformation Modes in Gradient Structure Mg Alloys[J].金属学报：英文版,2020,0(2):252-266. 被引量：3

6Shan Cecilia Cao,Xiaochun Zhang,Jian Lu,Yongli Wang,San-Qiang Shi,Robert O.Ritchie.Predicting surface deformation during mechanical attrition of metallic alloys[J].计算材料学（英文）,2019(1):843-857.

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Chinese Library Classification Number:TG146.45[金属学及工艺—金属材料]

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The surface mechanical attrition treatment(SMAT)process and double-sided simultaneous attrition were used to produce a gradient structure on the surface of Mg-Gd-Y alloy,and the SMAT samples were subjected to short-term annealing treatment to optimize their performance.By changing SMAT duration and sample thickness,the effect of the volume ratio of gradient-structured layer to matrix layer on mechanical properties of the alloy was studied.The results show that the SMAT samples have gradient structure in the near-surface layer,which can be divided into the severely deformed area at the most surface layer,the moderately deformed area at the sub-surface layer,and the matrix area at the bottom layer in turn.With the increase of SMAT duration,the thickness of the gradient-structured layer shows an increasing trend.The thickness of the gradient-structured layer in the relatively thin samples slowly increases due to elastic deformation and plastic deformation in the initial stage of SMAT.For samples with a thickness of more than 2 mm,their gradient-structured layers have similar thickness after SMAT for 200 min.As the volume ratio of the gradient-structured layer increases,the overall yield strength of the samples shows an upward trend.After the SMAT samples are subjected to short-term annealing,the grains of the gradient-structured layer significantly grow up,and dislocations and twins are significantly reduced,resulting in decreased yield strength and significantly improved elongation at break of the alloy.