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Strengthening and toughening of Mg-based bulk metallic glass via in-situ formed B2-type AgMg phase
S. G. Wang; J. Xu
2013
Source PublicationJournal of Non-Crystalline Solids
ISSN0022-3093
Volume379Pages:40-47
AbstractBy tuning the composition and melt cooling rate, in situ composites of bulk metallic glass (BMG) with primary phase of B2-type AgMg compound can be fabricated in Mg-Cu-Ag-Y quaternary systems. In the composite, volume fraction of AgMg dendrites dispersed in the glass matrix varies in a range of 20-40%. In contrast to monolithic BMG. Mg52.8Cu19.9Ag1.95Y7.8 composite with AgMg of 40 vol.% dendrites manifest a distinct improvement in the compressive yield strength (similar to 1040 MPa), fracture strength (1.2 GPa) and plastic strain (0.4-2%), as well as an apparent work-hardening effect. Moreover, AgMg phase in the composite plays a significant role to suppress the crack propagation, then enhancing the fracture toughness, as indicated by an increment of notch toughness (K-Q) from similar to 6 MPa m(1/2) of monolithic BMG to similar to 8 MPa m(1/2) of the composite. However, since the tiny plastic zone size of glassy matrix is unable to match the microstructural length scales, improvement in the ductility and toughness of Mg-based BMG in situ composite remains limited. (C) 2013 Elsevier B.V. All rights reserved.
description.department[wang, shao-gang ; xu, jian] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; xu, j (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; jianxu@imr.ac.cn
KeywordMetallic Glass Intermetallics Composites Fracture Toughness Strengthening Compressive Stress States Fracture-toughness Matrix Composites Intermetallic Compounds Compound Agmg Plasticity Ductility Tensile Behavior Microstructure
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72418
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
S. G. Wang,J. Xu. Strengthening and toughening of Mg-based bulk metallic glass via in-situ formed B2-type AgMg phase[J]. Journal of Non-Crystalline Solids,2013,379:40-47.
APA S. G. Wang,&J. Xu.(2013).Strengthening and toughening of Mg-based bulk metallic glass via in-situ formed B2-type AgMg phase.Journal of Non-Crystalline Solids,379,40-47.
MLA S. G. Wang,et al."Strengthening and toughening of Mg-based bulk metallic glass via in-situ formed B2-type AgMg phase".Journal of Non-Crystalline Solids 379(2013):40-47.
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