Core-shell-structured particle reinforced A356 matrix composite prepared by powder-thixoforming: Effect of reheating temperature

doi:10.3390/ma11091718

	Core-shell-structured particle reinforced A356 matrix composite prepared by powder-thixoforming: Effect of reheating temperature
	Chen, Tijun; Geng, Libo; Qin, He; Gao, Min
刊名	Materials
	2018-09-13
卷号	11 期号:9
关键词	Aluminum compounds Cracks Fracture Industrial heating Particle reinforced composites Powder metallurgy Reinforcement Shells (structures) Silicon compounds Tensile strength Tensile testing Ductility improvement Geometrically necessary dislocations High-tensile strength Reheating temperature Solid solution strengthening Strengthening effect Structured particles Tensile elongation
DOI	10.3390/ma11091718
英文摘要	A novel core-shell-structured Ti-(Al-Si-Ti) particle (Ti-(Al-Si-Ti)p) reinforced A356 matrix composite was fabricated by a new method, powder thixoforming, which combines the merits of both powder metallurgy and semisolid thixoforming. The effects of reheating temperature on the microstructure and tensile properties of the resulting composite were investigated. The results indicated that the thickening of the Al-Si-Ti compound shells, with rising the reheating temperature, significantly enhanced the strengthening role, but the fracture and peeling of the shells, at higher than 600 °C, impaired the strengthening effect. The composite formed at 600 °C had a favorable tensile elongation of 8.3% besides high tensile strengths. During tensile testing, the Ti@(Al-Si-Ti)p frequently fractured across the Ti cores and occasionally cracked around the Ti cores, but preferentially fractured between the outer cracked shells and the inner cores for the composites thixoformed at higher than 600 °C. The delayed formation of cracks in the Ti-(Al-Si-Ti)p and the small size of the cracks contributed to ductility improvement. The MSL model, modified according to the Ti@(Al-Si-Ti)p characteristics, was essentially suitable for predicting the yield strength of such composites. The largest contribution to the strength was resulted from solid solution strengthening of Ti element, but the strengthening role from geometrically necessary dislocations was significantly improved as the reheating temperature rose from 590 °C to 600 °C. © 2018 by the authors.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	MDPI AG, Postfach, Basel, CH-4005, Switzerland
WOS记录号	WOS:000446395200234
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114075]
专题	材料科学与工程学院
作者单位	State Key Laboratory of Advanced Processing and Recycling of NonferrousMetals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Chen, Tijun,Geng, Libo,Qin, He,et al. Core-shell-structured particle reinforced A356 matrix composite prepared by powder-thixoforming: Effect of reheating temperature[J]. Materials,2018,11(9).
APA	Chen, Tijun,Geng, Libo,Qin, He,&Gao, Min.(2018).Core-shell-structured particle reinforced A356 matrix composite prepared by powder-thixoforming: Effect of reheating temperature.Materials,11(9).
MLA	Chen, Tijun,et al."Core-shell-structured particle reinforced A356 matrix composite prepared by powder-thixoforming: Effect of reheating temperature".Materials 11.9(2018).