Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy

doi:10.1016/j.jallcom.2014.11.212

	Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy
	Li, Qinglin 2; Li, Fubin 1; Xia, Tiandong 1; Lan, Yefeng 1; Jian, Yisheng 1; Tao, Fan 1
刊名	Journal of Alloys and Compounds
	2015-04-05
卷号	627 页码:352-358
关键词	Alumina Aluminum oxide Dendrites (metallography) Eutectics Heat treatment Mechanical properties Microstructural evolution Microstructure Morphology Particle size analysis Scanning electron microscopy Silicon alloys Tensile strength Tensile testing A356 alloys A356 aluminium alloy Hypoeutectic Al-Si alloy In-situ reactions Microstructural analysis Microstructure and mechanical properties Plate-like structure Ultimate tensile strength
ISSN号	09258388
DOI	10.1016/j.jallcom.2014.11.212
英文摘要	It is well known that the mechanical properties of hypoeutectic Al-Si alloys are influenced by the size, morphology and distribution of primary α-Al and eutectic Si crystals. In the present study, the effect of in-situ γ-Al2O3 particles and heat treatment on the size and morphology of the primary α-Al dendrites and eutectic Si phases in A356 alloy has been investigated. The as-cast and solution treatment samples were characterized by scanning electron microscopy (SEM). Microstructural analyses demonstrated that primary α-Al was significantly refined by in-situ γ-Al2O3 particles. The secondary dendrite arm space (SDAS) of unrefined α-Al is about 25 μm. The SDAS decreases to 11 μm when the content of in-situ γ-Al2O3 particles is 0.6%. In addition, the eutectic Si structure was modified from coarse needle-like/platelet-like structure to short plate-like structure and some discrete particles. The mechanical properties were investigated by tensile test with various concentrations of γ-Al2O3 particles. It was found that the ultimate tensile strength (UTS) and elongation (El) increased by 41% and 137%, respectively, due to decreasing SDAS of primary α-Al dendrites and modifying eutectic Si crystals. Moreover, the change of mechanical properties corresponds to the evolution of microstructure. © 2014 Elsevier B.V. All rights reserved.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000348504800050
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112474]
专题	材料科学与工程学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China 2.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Li, Qinglin,Li, Fubin,Xia, Tiandong,et al. Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy[J]. Journal of Alloys and Compounds,2015,627:352-358.
APA	Li, Qinglin,Li, Fubin,Xia, Tiandong,Lan, Yefeng,Jian, Yisheng,&Tao, Fan.(2015).Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy.Journal of Alloys and Compounds,627,352-358.
MLA	Li, Qinglin,et al."Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy".Journal of Alloys and Compounds 627(2015):352-358.