Microstructural evolution and mechanical properties of ultrafine grained Al3Ti/Al-5.5Cu composites produced via hot pressing and subsequent friction stir processing

IMR OpenIR

	Microstructural evolution and mechanical properties of ultrafine grained Al3Ti/Al-5.5Cu composites produced via hot pressing and subsequent friction stir processing
	Q. Zhang; B. L. Xiao; P. Xue; Z. Y. Ma
	2012
发表期刊	Materials Chemistry and Physics
ISSN	0254-0584
卷号	134 期号:1 页码:294-301
摘要	In situ Al3Ti/Al-5.5Cu composites fabricated by powder metallurgy and subsequent forging were subjected to multiple pass friction stir processing (FSP) with and without active cooling. The forged sample exhibited lower strength and ductility due to the presence of coarse Al3Ti clusters with a size range of 50-100 mu m and coarse matrix grains. Four-pass FSP in air resulted in the refinement and redistribution of the Al3Ti clusters, and the generation of micron matrix grains, thereby increasing the strength and ductility of the composites. Furthermore, coarse Al2Cu particles dissolved and re-precipitated due to a relatively long duration of thermal exposure. Additional two pass FSP with rapid water cooling (FSP-water) dissolved most of the Al2Cu into the matrix and retained the solutes in solution due to the short duration of thermal exposure. Meanwhile, ultrafine matrix grains with a high density of dislocations were obtained. These microstructural changes led to significant increase in strength and a decrease in ductility in the FSP-water sample. After aging, the FSP-water sample exhibited further increased yield strength and ultimate tensile strength due to the precipitation of metastable Al2Cu phases. However, the ductility did not decrease due to the decrease of dislocation density after aging. (C) 2012 Elsevier B.V. All rights reserved.
部门归属	[zhang, q.; xiao, b. l.; xue, p.; ma, z. y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [zhang, q.] univ sci & technol china, hefei 230026, peoples r china.;ma, zy (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.;zyma@imr.ac.cn
关键词	Composite Materials Intermetallic Compounds Powder Metallurgy Mechanical Properties Microstructure Metal-matrix Composites In-situ Reinforced Aluminum Fracture-behavior Al Alloy Cu Superplasticity Enhancement Strength
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60452
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,P. Xue,et al. Microstructural evolution and mechanical properties of ultrafine grained Al3Ti/Al-5.5Cu composites produced via hot pressing and subsequent friction stir processing[J]. Materials Chemistry and Physics,2012,134(1):294-301.
APA	Q. Zhang,B. L. Xiao,P. Xue,&Z. Y. Ma.(2012).Microstructural evolution and mechanical properties of ultrafine grained Al3Ti/Al-5.5Cu composites produced via hot pressing and subsequent friction stir processing.Materials Chemistry and Physics,134(1),294-301.
MLA	Q. Zhang,et al."Microstructural evolution and mechanical properties of ultrafine grained Al3Ti/Al-5.5Cu composites produced via hot pressing and subsequent friction stir processing".Materials Chemistry and Physics 134.1(2012):294-301.