Effects of reheating duration on the microstructure and tensile properties of in situ core–shell-structured particle-reinforced A356 composites fabricated via powder thixoforming

doi:10.1007/s10853-017-1713-2

	Effects of reheating duration on the microstructure and tensile properties of in situ core–shell-structured particle-reinforced A356 composites fabricated via powder thixoforming
	Chen, T.J.; Qin, H.; Zhang, X.Z.
刊名	Journal of Materials Science
	2018-02-01
卷号	53 期号:4 页码:2576-2593
关键词	Crack propagation Crack tips Fabrication Industrial heating Intermetallics Microstructure Powders Reinforcement Shells (structures) Tensile strength Titanium compounds Fabrication technique Inter-metallic particle Modified shear lag model Reinforcing particles Severe plastic deformations Strengthening mechanisms Structured particles Ultimate tensile strength
ISSN号	00222461
DOI	10.1007/s10853-017-1713-2
英文摘要	A novel in situ core–shell-structured Ti@(Al–Si–Ti) particulate-reinforced A356 composite was synthesized via powder thixoforming. It is noted that there is a significant improvement in toughness of the particulate-reinforced Al matrix composites, and the problems related to fabrication techniques were also solved. The effects of reheating duration at a semisolid temperature of 600 °C on the microstructure and tensile properties of the resulting composites were investigated. The results indicated that a thick, compact Al–Si–Ti intermetallic shell formed around the Ti powders when the reheating time was at 50 min. A composite containing these reinforcing particles exhibited good tensile properties. Its ultimate tensile strength and yield strength (YS) were decreased by only 2.1 and 3.5%, respectively, while its elongation was increased by 167.8% and up to 8.3%, compared to the (Al, Si)3Tip/A356 composite that was thixoformed after the Ti powders had completely reacted. This occurred because the core–shell-structured particles with hard, compact shells exhibited strengthening role comparable to that provided by the monolithic (Al, Si)3Ti intermetallic particles, and the Ti core effectively inhibited or delayed crack propagation by blunting crack tips and severe plastic deformation. In addition, a modified shear lag model that incorporated the indirect strengthening mechanisms and varying shell thicknesses of Al–Si–Ti intermetallics was proposed to successfully predict the YS of the composites. © 2017, Springer Science+Business Media, LLC.
WOS研究方向	Materials Science
语种	英语
出版者	Springer New York LLC
WOS记录号	WOS:000416544500024
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113798]
专题	材料科学与工程学院
作者单位	State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Chen, T.J.,Qin, H.,Zhang, X.Z.. Effects of reheating duration on the microstructure and tensile properties of in situ core–shell-structured particle-reinforced A356 composites fabricated via powder thixoforming[J]. Journal of Materials Science,2018,53(4):2576-2593.
APA	Chen, T.J.,Qin, H.,&Zhang, X.Z..(2018).Effects of reheating duration on the microstructure and tensile properties of in situ core–shell-structured particle-reinforced A356 composites fabricated via powder thixoforming.Journal of Materials Science,53(4),2576-2593.
MLA	Chen, T.J.,et al."Effects of reheating duration on the microstructure and tensile properties of in situ core–shell-structured particle-reinforced A356 composites fabricated via powder thixoforming".Journal of Materials Science 53.4(2018):2576-2593.