High ductility in solution-treated Mg-Sc-Yb-Mn-Zr alloy mediated by < c plus a > dislocations

doi:10.1016/j.jallcom.2021.159880

	High ductility in solution-treated Mg-Sc-Yb-Mn-Zr alloy mediated by < c plus a > dislocations
	Zhou, Tianshui 1,2; Liu, Zehua 1,2; Yang, Donglin 1,2; Meng, Shuaiju 1,2; Jia, Zhi 1,2; Liu, Dexue 1,2
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2021
卷号	873
关键词	Mg-Sc-Yb-Mn-Zr alloy Solid-solution treatment High ductility < c plus a > dislocations
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2021.159880
英文摘要	Due to their unique crystal structure, preparation of high-ductility Mg alloys is still a great challenge, especially high-ductility as-cast or heat-treated Mg alloys. Here, the effect of Sc on the microstructure, second phases, and mechanical properties of as-cast and heat-treated Mg-xSc-3Yb-1Mn-0.5Zr (x = 2, 3, 4, 6 wt%) alloys was investigated systematically. The results indicated that as-cast samples mainly consisted of alpha-Mg, MgSc, Mg2Yb, Mn2Zr and Mn2Sc phases. Moreover, the average grain sizes of all alloys clearly decreased with the addition of Sc. After solid-solution treatment at 525 degrees C for 12 h, the tensile elongation (El.) of Mg-xSc-3Yb-1Mn-0.5Zr (x = 2, 3, 4, 6 wt%) alloys improved and the 6 wt% Sc-containing solution-treated sample demonstrated the maximum El. of 28%. Examination of high-ductility solution-treated alloy microstructure revealed that dislocation slip was the primary deformation mechanism during tensile testing. In particular, the high ductility was primarily associated with the activation of profuse < c + a > dislocations, which can significantly accommodate c-axis strain to improve plasticity. Besides, both grain refinement and solid-solution strengthening were also responsible for the large El. of the Mg-6Sc-3Yb-1Mn-0.5Zr alloy. This work can provide useful insights into developing high-ductility Mg alloys using Sc alloying and solution treatment (T4). (c) 2021 Published by Elsevier B.V.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000651262600002
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148173]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China 2.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China;
推荐引用方式 GB/T 7714	Zhou, Tianshui,Liu, Zehua,Yang, Donglin,et al. High ductility in solution-treated Mg-Sc-Yb-Mn-Zr alloy mediated by < c plus a > dislocations[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,873.
APA	Zhou, Tianshui,Liu, Zehua,Yang, Donglin,Meng, Shuaiju,Jia, Zhi,&Liu, Dexue.(2021).High ductility in solution-treated Mg-Sc-Yb-Mn-Zr alloy mediated by < c plus a > dislocations.JOURNAL OF ALLOYS AND COMPOUNDS,873.
MLA	Zhou, Tianshui,et al."High ductility in solution-treated Mg-Sc-Yb-Mn-Zr alloy mediated by < c plus a > dislocations".JOURNAL OF ALLOYS AND COMPOUNDS 873(2021).