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Micro-hardness and strain-rate-dependent compressive response of an ultra-light-weight Mg-Li-Al alloy
Li, Haoyang1; Shao, Chenwei2; Rojas, David Funes3; Ponga, Mauricio3; Hogan, James D.1
Corresponding AuthorLi, Haoyang(haoyang@ualberta.ca) ; Ponga, Mauricio(mponga@mech.ubc.ca)
2021-01-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume890Pages:15
AbstractA 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.
KeywordMg-Li-Al Ultra-light-weight XPS Strain-rate-dependent uniaxial compression SHPB Micro-hardness Compressive strength Failure mechanisms
Funding OrganizationInnovation 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
DOI10.1016/j.jallcom.2021.161703
Indexed BySCI
Language英语
Funding ProjectInnovation 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 Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000705467400001
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/166530
Collection中国科学院金属研究所
Corresponding AuthorLi, Haoyang; Ponga, Mauricio
Affiliation1.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
Recommended Citation
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.
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