| An investigation on particle weakening in T6-treated SiC/Al-Zn-Mg-Cu composites | |
| Ma, G. N.1,2; Wang, D.1; Liu, Z. Y.1; Xiao, B. L.1; Ma, Z. Y.1 | |
| Corresponding Author | Wang, D.(dongwang@imr.ac.cn) ; Xiao, B. L.(blxiao@imr.ac.cn) |
| 2019-12-01 | |
| Source Publication | MATERIALS CHARACTERIZATION
 |
| ISSN | 1044-5803 |
| Volume | 158Pages:10 |
| Abstract | This study found weakening effect of SiC particles on strength of a T6-treated SiC/Al-Zn-Mg-Cu composite. The mechanisms for the weakening were investigated in detail for the first time. The 15 vol% SiC/7085Al composite and 7085Al alloy were fabricated by powder metallurgy (PM) method and subjected to microstruttural examination and mechanical properties evaluation. It was indicated that the as-extruded composite had 92 MPa enhancement in the ultimate tensile strength (UTS) compared to the as-extruded unreinforced alloy. However, After T6 treatment (solution treatment and artificial ageing), the UTS of the composite was 34 MPa lower than that of the unreinforced alloy. Microstructural examination disclosed that the content of eta'-MgZn2 was reduced in the T6-treated composite due to interface reaction between Mg and oxide on the surface of SiC particles. Meanwhile, compared to the unreinforced alloy, the composite had coarser precipitates with relative lower density under the T6 condition. Furthermore, it was found that SiC particles accelerated ageing process, leading to formation of coarse precipitates and precipitate free zone in the vicinity of SiC-Al interface. According to the theoretical calculation, the weakened precipitation strengthening value was not compensated by mismatch dislocation strengthening and load transfer strengthening. By adding additional Mg (1.0 wt%) into the composite, the precipitation strengthening effect could be basically recovered, resulting in significantly enhanced strength compared to the 7085Al alloy. |
| Keyword | Metal matrix composites Mechanical properties Interfacial reaction Ageing Strengthening mechanisms |
| Funding Organization | National Key R & D Program of China ; National Natural Science Foundation of China |
| DOI | 10.1016/j.matchar.2019.109966 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Key R & D Program of China[2017YFB0703104] ; National Natural Science Foundation of China[51771193] ; National Natural Science Foundation of China[U1508216] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing |
| WOS ID | WOS:000503314000020 |
| Publisher | ELSEVIER SCIENCE INC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/136279 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Wang, D.; Xiao, B. L. |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China |
| Recommended Citation GB/T 7714 | Ma, G. N.,Wang, D.,Liu, Z. Y.,et al. An investigation on particle weakening in T6-treated SiC/Al-Zn-Mg-Cu composites[J]. MATERIALS CHARACTERIZATION,2019,158:10. |
| APA | Ma, G. N.,Wang, D.,Liu, Z. Y.,Xiao, B. L.,&Ma, Z. Y..(2019).An investigation on particle weakening in T6-treated SiC/Al-Zn-Mg-Cu composites.MATERIALS CHARACTERIZATION,158,10. |
| MLA | Ma, G. N.,et al."An investigation on particle weakening in T6-treated SiC/Al-Zn-Mg-Cu composites".MATERIALS CHARACTERIZATION 158(2019):10. |
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