Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment

doi:10.1016/j.jmst.2020.11.017

IMR OpenIR

	Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment
	Liu, Chunquan 1,2; Chen, Xianhua 1,2,3; Yuan, Yuan 1,2; Zhang, Wei 4; Zhang, Yusheng 4; Pan, Fusheng 1,2
通讯作者	Chen, Xianhua(xhchen@cqu.edu.cn)
	2021-07-10
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	78 页码:20-29
摘要	To gain insight into the ageing behavior of ultrafine grain (UFG) structure, the precipitation phenomena and microstructural evolutions of Mg-6Zn-1Y-0.4Ce-0.5 Zr (wt.%) alloy processed by sliding friction treatment (SFT) were systematically studied using hardness texting, transmission electron microscopy (TEM) equipped with high-angle annular dark-field scanning (HADDF-STEM), X-ray diffraction (XRD) and XRD line broadening analysis. The microhardness of the SFT-processed (SFTed) sample initially decreases from 109.6 HV to 104.8 HV at ageing for 8 h, and then increases to the peak-ageing point of 115.4 HV at 16 h. Subsequently, it enters the over-aged period. The un-SFTed sample, as the counterpart, follows a regular ageing behavior that increases from 89.9 HV to 99.6 HV when ageing for 12 h, and then drops. A multi-mechanistic model is established to describe the strengthening due to grain refinement, dislocation accumulation, precipitation etc. The analysis reveals that the temperature sensitive UFG structure has an obvious grain coarsening effect, which arouses the soft phenomenon in the early ageing stage. But precipitation hardening provides an excellent hardness enhancement for overcoming the negative influence and helping to reach the peak-aged point. In our microstructural observations, a lot of equilibrium ultrafine MgZn2 precipitates precipitate along dislocations because defects can provide the favorable conditions for the migration and segregation of solute atoms. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Ageing behavior Ultrafine-crystalline grain Nano precipitates Sliding friction treatment
资助者	National Key R&D Program of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
DOI	10.1016/j.jmst.2020.11.017
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2016YFB0301100] ; National Natural Science Foundation of China[51571043] ; Fundamental Research Funds for the Central Universities[2020CDJDPT001] ; Fundamental Research Funds for the Central Universities[cqu2018CDHB1A08] ; Fundamental Research Funds for the Central Universities[2018CDGFCL0005]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000652023600002
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/161476
专题	中国科学院金属研究所
通讯作者	Chen, Xianhua
作者单位	1.Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys MOE, Chongqing 400045, Peoples R China 2.Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400045, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 4.Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China
推荐引用方式 GB/T 7714	Liu, Chunquan,Chen, Xianhua,Yuan, Yuan,et al. Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,78:20-29.
APA	Liu, Chunquan,Chen, Xianhua,Yuan, Yuan,Zhang, Wei,Zhang, Yusheng,&Pan, Fusheng.(2021).Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,78,20-29.
MLA	Liu, Chunquan,et al."Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 78(2021):20-29.