气候变化领域集成服务门户(CCPortal): Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment

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DOI	10.1016/j.jmst.2020.11.017
	Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment
	Liu, Chunquan; Chen, Xianhua; Yuan, Yuan; Zhang, Wei; Zhang, Yusheng; Pan, Fusheng
通讯作者	Chen, XH (通讯作者)，Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys MOE, Chongqing 400045, Peoples R China.
发表日期	2021
ISSN	1005-0302
起始页码	20
结束页码	29
卷号	78
英文摘要	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	HIGH-PRESSURE TORSION MECHANICAL-PROPERTIES DEFORMATION-BEHAVIOR HIGH-STRENGTH PRECIPITATION DISLOCATION CU MICROSTRUCTURE METALS MODEL
英文关键词	Ageing behavior; Ultrafine-crystalline grain; Nano precipitates; Sliding friction treatment
语种	英语
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
来源期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255007
作者单位	[Liu, Chunquan; Chen, Xianhua; Yuan, Yuan; Pan, Fusheng] Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys MOE, Chongqing 400045, Peoples R China; [Liu, Chunquan; Chen, Xianhua; Yuan, Yuan; Pan, Fusheng] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400045, Peoples R China; [Chen, Xianhua] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China; [Zhang, Wei; Zhang, Yusheng] 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]. 中国科学院西北生态环境资源研究院,2021,78.
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.
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).