Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates

doi:10.1016/j.compositesb.2020.108541

	Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates
	Zhang, Xuezheng 2,3; Chen, Tijun 2; Ma, Siming 3; Qin, He 2; Ma, Jinyuan 1
刊名	Composites Part B: Engineering
	2021-02-01
卷号	206
关键词	Aluminum alloys Composite structures Crack tips Ductility Economic and social effects Inverse problems Matrix algebra Metallic matrix composites Nanoparticles Particle reinforced composites Particles (particulate matter) Shells (structures) Silicon Strain hardening Tensile strength Titanium Aluminum matrix composites Dispersion of nano particles Heterogeneous structures Particulate-reinforced metal matrix Strength and ductilities Stress induced phase transformations Transformation induced plasticity Ultimate tensile strength
ISSN号	13598368
DOI	10.1016/j.compositesb.2020.108541
英文摘要	The trade-off between strength and ductility of particulate reinforced metal matrix composites (PRMMCs) has been a longstanding puzzle. Here we propose an effective strategy to surmount the inverse relationship between strength and ductility of an A356 Al alloy based PRMMC by in situ synthesizing novel reinforcing particulates with a special core-shell (CS) structure. Such structure features a Ti core inside a dual-layer shell: the inner layer has a nano-grained (~130 nm) heterogeneous structure, and the outer layer possesses a composite structure composed of a (Al,Si)3Ti substrate with dense dispersion of nanoparticles. As a result, the obtained composite reinforced with such CS reinforcing particulates (CS composite) achieves an unprecedented tensile elongation to failure of 8.3 ± 0.8% and a uniform elongation of 7.1 ± 0.6%, which nearly triples that of the same alloy based composite reinforced with monolithic (Al,Si)3Ti particulates (monolithic composite) and equivalent to corresponding matrix alloy while maintaining high ultimate tensile strength of 373 ± 8.8 MPa and yield strength of 268 ± 7.9 MPa, equivalent to monolithic composite simultaneously. This special architecture of shell renders itself a high capability of stress bearing and good toughness, and the nanoparticles in outer layer further slower crack development, which significantly postpone crack formation in shell. Subsequent propagation of cracks in Ti core is also constrained remarkably by the transformation-induced plasticity effect occurred ahead of crack tips resulting from stress-induced phase transformation of hcp-Ti into fcc-Ti. These factors lead to highest work hardening rate that undergoes a long plateau and thus overcome the strength-ductility trade-off of A356 alloy based PRMMC. © 2020 Elsevier Ltd
WOS研究方向	Engineering ; Materials Science
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000600593500007
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147141]
专题	材料科学与工程学院
作者单位	1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang; 110016, China 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 3.School of Engineering Technology, Purdue University, 401 N. Grant Street, West Lafayette; IN; 47906, United States;
推荐引用方式 GB/T 7714	Zhang, Xuezheng,Chen, Tijun,Ma, Siming,et al. Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates[J]. Composites Part B: Engineering,2021,206.
APA	Zhang, Xuezheng,Chen, Tijun,Ma, Siming,Qin, He,&Ma, Jinyuan.(2021).Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates.Composites Part B: Engineering,206.
MLA	Zhang, Xuezheng,et al."Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates".Composites Part B: Engineering 206(2021).