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	EVOLUTION OF Sigma 3 BOUNDARIES DURING RECRYSTALLIZATION OF COLD-ROLLED NICKEL DEFORMED TO HIGH STRAIN
	Zhang Yubin ; Godfrey, A. ; Liu Wei ; Liu Qing
	2010-10-12 ; 2010-10-12
关键词	Ni electron backscattered diffraction (EBSD) recrystallization Sigma 3 boundary grain boundary engineering (GBE) CHARACTER-DISTRIBUTION INTERGRANULAR CORROSION GRAIN-BOUNDARIES COPPER 304-STAINLESS-STEEL OPTIMIZATION ENSEMBLES GROWTH DESIGN CREEP Metallurgy & Metallurgical Engineering
中文摘要	The concept of grain boundary engineering (GBE) has been proposed based on the fact that many studies have demonstrated that boundaries associated with low Sigma-value coincident site lattice (CSL) misorientations show higher resistance to intergranular fracture and corrosion, reduced susceptibility to impurity segregation and superior ductility. It is commonly accepted that for fcc metals of low to medium stacking fault energy metals, including Ni and many Ni-alloys, the most important CSL boundary for the GBE process is a Sigma 3 boundary, the occurrence of which is dominated by the formation of annealing twins. Moreover, it has been found that repetitive thermo-mechanical processing can be used to increase further the fraction of Sigma 3 (and Sigma 3(n) (n >1)) boundaries. However, the mechanism for this is not yet clear. Therefore, an investigation on the evolution of Sigma 3 boundaries during recrystallization is important for understanding the mechanisms of GBE for those materials. In the present paper the evolution of Sigma 3 boundaries during recrystallization in a 96% cold-rolled sample of pure nickel of 99.996% purity has been explored using orientation maps obtained using electron backscatter diffraction (EBSD). Each orientation map was taken from the same area after annealing for various times. Based on the EBSD data the Sigma 3 boundaries can be divided into two groups: "twin" type and "non-twin" type. These groups can be differentiated using a parameter of deviation angle (Delta theta) of boundary misorientation to the ideal twin misorientation (60 degrees < 111 >). During recrystallization incoherent twin boundaries are found to develop from coherent twin boundaries. It is also that most Sigma 3(n) (n >1) boundaries are formed by impringement of a nucleus with its n-order twins, and that the chance for such impingement events decreases significantly with increasing n. Most non-twin type Sigma 3 boundaries arise from impingement of Sigma 1 and twin type Sigma 3 boundaries. Non-twin type Sigma 3 boundaries may be more effective than twin type Sigma 3 boundaries to develop a beneficial grain boundary network.
语种	中文 ; 中文
出版者	SCIENCE PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78262]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang Yubin,Godfrey, A.,Liu Wei,et al. EVOLUTION OF Sigma 3 BOUNDARIES DURING RECRYSTALLIZATION OF COLD-ROLLED NICKEL DEFORMED TO HIGH STRAIN[J],2010, 2010.
APA	Zhang Yubin,Godfrey, A.,Liu Wei,&Liu Qing.(2010).EVOLUTION OF Sigma 3 BOUNDARIES DURING RECRYSTALLIZATION OF COLD-ROLLED NICKEL DEFORMED TO HIGH STRAIN..
MLA	Zhang Yubin,et al."EVOLUTION OF Sigma 3 BOUNDARIES DURING RECRYSTALLIZATION OF COLD-ROLLED NICKEL DEFORMED TO HIGH STRAIN".(2010).

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