An investigation on particle weakening in T6-treated SiC/Al-Zn-Mg-Cu composites

doi:10.1016/j.matchar.2019.109966

IMR OpenIR

	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
通讯作者	Wang, D.(dongwang@imr.ac.cn) ; Xiao, B. L.(blxiao@imr.ac.cn)
	2019-12-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	158 页码:10
摘要	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.
关键词	Metal matrix composites Mechanical properties Interfacial reaction Ageing Strengthening mechanisms
资助者	National Key R & D Program of China ; National Natural Science Foundation of China
DOI	10.1016/j.matchar.2019.109966
收录类别	SCI
语种	英语
资助项目	National Key R & D Program of China[2017YFB0703104] ; National Natural Science Foundation of China[51771193] ; National Natural Science Foundation of China[U1508216]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:000503314000020
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：52[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/136279
专题	中国科学院金属研究所
通讯作者	Wang, D.; Xiao, B. L.
作者单位	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
推荐引用方式 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.