Contributions to yield strength in an ultrafine grained 1050 aluminum alloy after DC current annealing

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	Contributions to yield strength in an ultrafine grained 1050 aluminum alloy after DC current annealing
	Cao, YH; He, LZ; Zhou, YZ; Wang, P; Cui, JZ; He, LZ (reprint author), Northeastern Univ, Minist Educ, Key Lab Electromagnet Proc Mat, Shenyang 110819, Peoples R China.
	2016-09-30
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	674 页码:193-202
摘要	The ultrafine grained (UFG) 1050 aluminum alloy was prepared by equal channel angular pressing at cryogenic temperature (cryoECAP). The evolution of the yield strength and microstructures of UFG 1050 aluminum alloy after direct electric current (DC current) annealing at 150-400 degrees C for 1 h were investigated by tensile test, electron back scattering diffraction pattern (EBSD) and transmission electron microscopy (TEM). For the cryoECAPed and annealed samples at 150-250 degrees C, the predominant boundaries are high angle boundaries (HABs) (> 60%), many dislocations accumulate at subgrain and/or grain boundaries, the yield strength (126-159 MPa) mainly comes from the dislocation and grain boundary strengthening contributions. While an unusual increase in the yield strength (by 8.1-11.2%) observed in samples annealed at 150-200 degrees C is attributed to an additional strengthening contribution from the more HABs having stable structures which can act as effective barriers to dislocation motion during tensile deformation. When annealing at 300-400 degrees C, the microstructures are free of dislocations, the yield strength (29-45 MPa) comes from the grain boundary strengthening contribution. With the application of DC current, the larger grain size, lower dislocation density and higher fraction of LABs having misorientation angle between 3-7 degrees in samples annealed at 150-250 degrees C result in the lower yield strength, while the smaller average grain sizes in samples annealed at 300-400 degrees C cause the higher yield strength. (C) 2016 Elsevier B.V. All rights reserved.
部门归属	[cao, yiheng ; he, lizi ; wang, ping ; cui, jianzhong] northeastern univ, minist educ, key lab electromagnet proc mat, shenyang 110819, peoples r china ; [he, lizi ; wang, ping ; cui, jianzhong] northeastern univ, sch mat sci & engn, shenyang 110819, peoples r china ; [zhou, yizhou] chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词	Direct Electric Current Annealing Ultrafine Grained 1050 Aluminum Alloy Yield Strength Dislocations High Angle Boundaries
学科领域	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China [51574076]; Fundamental Research Funds for the Central University [N150902001]
收录类别	sci
语种	英语
WOS记录号	WOS:000383292800025
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/76273
专题	中国科学院金属研究所
通讯作者	He, LZ (reprint author), Northeastern Univ, Minist Educ, Key Lab Electromagnet Proc Mat, Shenyang 110819, Peoples R China.
推荐引用方式 GB/T 7714	Cao, YH,He, LZ,Zhou, YZ,et al. Contributions to yield strength in an ultrafine grained 1050 aluminum alloy after DC current annealing[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2016,674:193-202.
APA	Cao, YH,He, LZ,Zhou, YZ,Wang, P,Cui, JZ,&He, LZ .(2016).Contributions to yield strength in an ultrafine grained 1050 aluminum alloy after DC current annealing.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,674,193-202.
MLA	Cao, YH,et al."Contributions to yield strength in an ultrafine grained 1050 aluminum alloy after DC current annealing".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 674(2016):193-202.