Micro-hardness and strain-rate-dependent compressive response of an ultra-light-weight Mg-Li-Al alloy

doi:10.1016/j.jallcom.2021.161703

CORC > 金属研究所 > 中国科学院金属研究所

	Micro-hardness and strain-rate-dependent compressive response of an ultra-light-weight Mg-Li-Al alloy
	Li, Haoyang 1; Shao, Chenwei 2; Rojas, David Funes 3; Ponga, Mauricio 3; Hogan, James D.1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2021-01-15
卷号	890 页码:15
关键词	Mg-Li-Al Ultra-light-weight XPS Strain-rate-dependent uniaxial compression SHPB Micro-hardness Compressive strength Failure mechanisms
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2021.161703
通讯作者	Li, Haoyang(haoyang@ualberta.ca) ; Ponga, Mauricio(mponga@mech.ubc.ca)
英文摘要	A study on the microstructure and composition, micro-hardness and strain-rate-dependent compressive behaviors, and the associated failure mechanisms of an ultra-light-weight Mg-Li-Al alloy were conducted. X-ray diffraction and X-ray photoelectron spectroscopy showed a multi-phase material with similar to 35 wt% Li and similar to 20 wt% Al, and a dendritic "fishbone" microstructure resulted from the high percentage of both Li and Al. Micro-indentation measurements showed a superior hardness (1.63 +/- 0.08 GPa) that is > 1.5x higher than other Mg-Li-Al alloys reported in the literature, with a low density (similar to 1.68 g/cm(3)) comparable to Mg alloys. Strain-rate-dependent uniaxial compression experiments demonstrated no strain-rate-sensitivity in the peak strength (699.4 +/- 74.0 MPa) at strain rates between 10(-5) and 10(3) s(-1). High-speed imaging revealed a shear-mode brittle fracture under both quasi-static and dynamic conditions, with an additional splitting crack mechanism observed under dynamic loading. Crack propagation speeds demonstrated a positive correlation with strain rate from similar to 480 m/s at similar to 100 s(-1) to similar to 1000 m/s at similar to 2000 s(-1). Post-mortem analysis showed that the "fishbone" structure with a peeling fracture mechanism appears to be the dominant site promoting shear failure across all strain rates. (C) 2021 Elsevier B.V. All rights reserved.
资助项目	Innovation for Defence Excellence and Security (IDEaS) program of Canada[W7714-217552/001/] ; Natural Sciences and Engineering Research Council of Canada (NSERC)[2016-04685] ; Natural Sciences and Engineering Research Council of Canada (NSERC)[2016-06114] ; Department of Mechanical Engineering at the University of British Columbia
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:000705467400001
资助机构	Innovation for Defence Excellence and Security (IDEaS) program of Canada ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Department of Mechanical Engineering at the University of British Columbia
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/166529]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Haoyang; Ponga, Mauricio
作者单位	1.Univ Alberta, Dept Mech Engn, Edmonton, AB T6G 2R3, Canada 2.Chinese Acad Sci, Inst Met Res, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China 3.Univ British Columbia, Dept Mech Engn, Vancouver Campus, Vancouver, BC V5Z 1L4, Canada
推荐引用方式 GB/T 7714	Li, Haoyang,Shao, Chenwei,Rojas, David Funes,et al. Micro-hardness and strain-rate-dependent compressive response of an ultra-light-weight Mg-Li-Al alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,890:15.
APA	Li, Haoyang,Shao, Chenwei,Rojas, David Funes,Ponga, Mauricio,&Hogan, James D..(2021).Micro-hardness and strain-rate-dependent compressive response of an ultra-light-weight Mg-Li-Al alloy.JOURNAL OF ALLOYS AND COMPOUNDS,890,15.
MLA	Li, Haoyang,et al."Micro-hardness and strain-rate-dependent compressive response of an ultra-light-weight Mg-Li-Al alloy".JOURNAL OF ALLOYS AND COMPOUNDS 890(2021):15.