Reactive mechanism and mechanical properties of in situ composites fabricated from an Al-TiO2 system by friction stir processing

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	Reactive mechanism and mechanical properties of in situ composites fabricated from an Al-TiO2 system by friction stir processing
	Q. Zhang; B. L. Xiao; W. G. Wang; Z. Y. Ma
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:20 页码:7090-7103
摘要	In situ (Al3Ti + Al2O3)/Al composites were fabricated from powder mixtures of Al and TiO2 using hot pressing, forging and subsequent multiple-pass friction stir processing (FSP). The reactive mechanism and mechanical properties of the FSPed composites were investigated. Four-pass FSP with 100% overlapping induced the Al-TiO2 reaction, as a result of the enhanced solid diffusion and mechanical activation effect caused by the severe deformation of FSP. Decreasing the size of TiO2 from 450 to 150 nm resulted in the formation of more Al3Ti and Al2O3 particles. The formation mechanisms of Al2O3 and Al3Ti during FSP are understood to be a deformation-assisted interfacial reaction and deformation-assisted solution-precipitation, respectively, based on detailed microstructural observations. The microhardness, Young's modulus and tensile strength of the FSPed composites were substantially enhanced compared with those of FSPed pure Al with the same processing history, and increased as the TiO2 size decreased from 450 to 150 nm. The strengthening mechanisms of the FSPed composites included load transferring, grain refinement and Orowan strengthening, among which Orowan strengthening contributed the most to the yield strength of the composites. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[zhang, q.; xiao, b. l.; wang, w. g.; ma, z. y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;ma, zy (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.;zyma@imr.ac.cn
关键词	Metal Matrix Composites Aluminum Friction Stir Processing Solid-state Reaction Strengthening Mechanism Aluminum-matrix Composites Particle-reinforced Aluminum Al-11.5si-0.4mg Cast Alloys Displacement-reactions Plastic Relaxation Microstructure Al Al3ti Evolution Nanocomposites
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60451
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Q. Zhang,B. L. Xiao,W. G. Wang,et al. Reactive mechanism and mechanical properties of in situ composites fabricated from an Al-TiO2 system by friction stir processing[J]. Acta Materialia,2012,60(20):7090-7103.
APA	Q. Zhang,B. L. Xiao,W. G. Wang,&Z. Y. Ma.(2012).Reactive mechanism and mechanical properties of in situ composites fabricated from an Al-TiO2 system by friction stir processing.Acta Materialia,60(20),7090-7103.
MLA	Q. Zhang,et al."Reactive mechanism and mechanical properties of in situ composites fabricated from an Al-TiO2 system by friction stir processing".Acta Materialia 60.20(2012):7090-7103.