Understanding the enhanced ductility of Mg-Gd with Ca and Zn microalloying by slip trace analysis

Jun Zhao ¹Bin Jiang ²Yuan Yuan ¹Qinghang Wang ³Ming Yuan ¹Aitao Tang ¹Guangsheng Huang ¹Dingfei Zhang ¹Fusheng Pan²

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作者信息

1. State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
2. State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China
3. School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China
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Abstract

This research studied the mechanisms of Ca and Zn microalloying on the enhancement of ductility of extruded Mg-Gd sheet by combing electron backscattered diffraction and slip trace analysis.The ductil-ity and microstructure of extruded Mg-0,6Gd and Mg-0.6Gd-0.3Ca-0,2Zn (wt％) sheets were investigated.Basal slip was the main deformation mode under investigation.Ca and Zn microalloying increased the frequency of grain boundaries (GBs) with misorientation angles (θs) ＜ 35°,promoted slip transfer across GBs and restricted the basal slip localization.In addition,there were a higher number of GB cracks homo-geneously distributed in the Mg-0.6Gd sheet than in the Mg-0.6Gd-0.3Ca-0.2Zn sheet,attributed to the increased cohesion of GBs.The enhancement of basal slip,the suppression of slip localization and the suppression of GB cracking were contributed to the increased ductility for Mg-0.6Gd-0.3Ca-0.2Zn sheet.

Key words

Mg-Gd/Ca-Zn microalloying/Slip trace/Cracking/Ductility

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基金项目

National Key Research and Development Program of China(2016YFB0101700)

National Key Research and Development Program of China(2016YFB0301104)

National Natural Science Foundation of China(U1764253)

National Natural Science Foundation of China(U2037601)

National Natural Science Foundation of China(51971044)

National Natural Science Foundation of China(52001037)

National Defense Basic Scientific Research program of China,the Qinghai Science and Technology Program(2018-GX-A1)

Chongqing Science and Technology Commission(Cstc2017zdcy-zdzxX0006)

Chongqing Scientific & Technological Talents Program(KJXX2017002)

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量53

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