Microstructural evolution in recrystallized and unrecrystallized Al-Mg-Sc alloys during superplastic deformation

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	Microstructural evolution in recrystallized and unrecrystallized Al-Mg-Sc alloys during superplastic deformation
	F. C. Liu; P. Xue; Z. Y. Ma
	2012
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	547 页码:55-63
摘要	The microstructural evolution of unrecrystallized (extruded) and recrystallized (friction stir processed, FSP)Al-Mg-Sc alloys during superplastic straining was investigated using electron backscatter diffraction (EBSD). The unrecrystallized structure gradually transformed into a recrystallized structure, characterized by equiaxed grains, random boundary misorientation distribution and a weak texture at high strains. This evolution was divided into three stages based on true stress-strain curves and EBSD maps, i.e. subgrain rotation and coalescence in the early stage, dynamic recrystallization in the middle stage, and grain boundary sliding (CBS) and dynamic grain growth in the final stage. By comparison, the recrystallized grains in the FSP Al-Mg-Sc maintained a random distribution during the whole deformation process, however the grain size increased significantly with increasing strain, indicating that the main deformation mechanism was always GBS and dynamic grain growth. A deformation model was proposed to explain the microstructural evolution during superplastic deformation. The microstructure with the random boundary misorientations reaches a dynamic balance because the transformation between high-angle grain boundaries and low-angle grain boundaries is equivalent. (C) 2012 Elsevier B.V. All rights reserved.
部门归属	[liu, f. c.; xue, p.; ma, z. y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, 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	Aluminum Alloys Superplasticity Friction Sir Processing Grain Boundaries Texture Low-temperature Superplasticity Zr Alloy Dynamic Recrystallization Polycrystalline Materials Boundary Diffusion Grain-boundaries Aluminum-alloys Strain Model Behavior
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60106
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. C. Liu,P. Xue,Z. Y. Ma. Microstructural evolution in recrystallized and unrecrystallized Al-Mg-Sc alloys during superplastic deformation[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2012,547:55-63.
APA	F. C. Liu,P. Xue,&Z. Y. Ma.(2012).Microstructural evolution in recrystallized and unrecrystallized Al-Mg-Sc alloys during superplastic deformation.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,547,55-63.
MLA	F. C. Liu,et al."Microstructural evolution in recrystallized and unrecrystallized Al-Mg-Sc alloys during superplastic deformation".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 547(2012):55-63.