| Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy | |
| Wei, J. X.1,2; Yan, H.1,3; Chen, R. S.1 | |
| Corresponding Author | Yan, H.(hyan@imr.ac.cn) |
| 2022-02-17 | |
| Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| ISSN | 0921-5093 |
| Volume | 835Pages:15 |
| Abstract | This study aims to elucidate the mechanical properties and fracture mechanisms of cast Mg-6Gd-3Y-0.4Zr (wt.%) (GW63) alloy in the presence of geometrical discontinuities induced by notches. Notch strength is evaluated by room-temperature tensile tests using circumferentially notched bars of different notch acuity. Finite element calculations suggest that notch fracture is controlled by the von Mises stress and effective plastic strain at the notch tip. Through fractographic observations and EBSD analysis on samples subjected to interrupted tests, a cleavage micro-cracking behavior uncommon for conventional Mg alloys is found to dominate notch fracture. Grain-sized cleavage microcracks tend to occur along the basal plane of grains favorably oriented for basal slip, which is explained by crack nucleation at co-planar slip bands blocked by the grain boundary according to Smith and Barnby's theory. Failure is initiated by the accumulation and coalescence of such microcracks in the notch vicinity. The unexpected cleavage micro-cracking behavior is mainly ascribed to the RE solutes that suppress {10-12} twinning, and is responsible for the limited deformation capacity and notch strength of the cast-T6 GW63 alloy with coarse grains and significant strengthening due to precipitation. |
| Keyword | Magnesium alloy Fracture Notch strength EBSD Finite element analysis |
| Funding Organization | National Natural Science Foundation of China ; Natural Science Foundation of Liaoning Province ; National Key Research and Development Program of China ; State Key Program of National Natural Science of China |
| DOI | 10.1016/j.msea.2022.142668 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51601193] ; National Natural Science Foundation of China[51701218] ; Natural Science Foundation of Liaoning Province[2020-MS-004] ; National Key Research and Development Program of China[2016YFB0301104] ; State Key Program of National Natural Science of China[51531002] |
| WOS Research Area | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000761774300004 |
| Publisher | ELSEVIER SCIENCE SA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/173187 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Yan, H. |
| Affiliation | 1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Shandong Univ Sci & Technol, Sch Mat Sci & Engn, Qingdao 266590, Shandong, Peoples R China |
| Recommended Citation GB/T 7714 | Wei, J. X.,Yan, H.,Chen, R. S.. Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,835:15. |
| APA | Wei, J. X.,Yan, H.,&Chen, R. S..(2022).Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,835,15. |
| MLA | Wei, J. X.,et al."Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 835(2022):15. |
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