EBSD ANALYSES OF THE MICROSTRUCTURAL EVOLUTION AND CSL CHARACTERISTIC GRAIN BOUNDARY OF COARSE--GRAINED NiAl ALLOY DURING PLASTIC DEFORMATION
HU Jing 1; LIN Dongliang2; WANG Yan1
1. School of Materials Science and Engineering; Jiangsu Polytechnic University; Changzhou 213016
2. School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai 200030
Cite this article:
HU Jing LIN Dongliang WANG Yan. EBSD ANALYSES OF THE MICROSTRUCTURAL EVOLUTION AND CSL CHARACTERISTIC GRAIN BOUNDARY OF COARSE--GRAINED NiAl ALLOY DURING PLASTIC DEFORMATION. Acta Metall Sin, 2009, 45(6): 652-656.
The microstructural evolution and the coincidence site lattice (CSL) characteristic grain boundary of coarse--grained NiAl alloy during plastic deformation at 1075℃ with the initial strain rate of 8.75×10-4 s-1 were studied using EBSD technique. Before deformation most grain boundaries are high angle boundaries, in which several particular angles are predominant, but low angle grain boundaries with misorientation less than 5° occurred successively during deformation. With the increase of the deformation, the misorientations of the newly--formed low angle grain boundaries increase, and grain boundaries with larger misorientation between 6°---15° are formed, and finally high angle grain boundaries with misorientation larger than 15° are formed. There exists a dynamic equilibrium between the formation rate of new low--angle grain boundaries and the rate of changing into higher--angle grain boundaries. Turning of low--angle into higher--angle grain boundaries results in the refinement of grains. The results also show that plastic deformation can change the CSL characteristic grain boundaries of the coarse--grained NiAl, which may improve mechanical properties of the alloy at room temperature.
[1] Li H T, Guo J T, Ye H Q. Rare Met Mater Eng, 2006; 35:1162
(李虎田, 郭建亭, 叶恒强. 稀有金属材料与工程, 2006; 35: 1162)
[2] Chokshi A H, Mukherjee A K, Langdon T G. Mater Sci Eng, 1993; R10: 237
[3] Mukherjee A K, Mishra R S. Mater Sci Forum, 1997; 243–245: 609
[4] Nieh T G, Wadsworth J. Mater Sci Eng, 1997; A239–240: 88
[5] Hu J, Lin D L. J Alloys Compd, 2006; 426: 162
[6] Hu J, Lin D L. Mater Sci Eng, 2006; A441: 142
[7] Jiang D M, Lin D L. Mater Lett, 2002; 57: 747
[8] Hu J, Lin D L. Mater Lett, 2004; 58: 1297
[9] Lin D L. Crystal Defects. Shanghai: Shanghai Jiao Tong University Press, 1996: 69
(林栋樑. 晶体缺陷. 上海: 上海交通大学出版社, 1996: 69)
[10] Zhang K, Wang W G, Fang X Y, Guo H. Acta Metall Sin,2008; 44: 652
(张坤, 王卫国, 方晓英, 郭 红. 金属学报, 2008; 44: 652)
[11] Watanabe T. Res Mech, 1984; 11: 47
[12] Wang W G, Zhou B X, Feng L, Zhang X, Xia S. Acta Metall Sin, 2006; 42: 715
(王卫国, 周邦新, 冯柳, 张欣, 夏爽. 金属学报, 2006; 42: 715)
[13] Cao S Q, Zhang J X, Wu J S, Chen J G. J Iron Steel Res,2005; 17: 51
(曹圣泉, 张津徐, 吴建生, 陈家光. 钢铁研究学报, 2005; 17: 51)
[14] Jiang D M, Ning J L, Sun J F, Hu Z M, Hou Y. Trans Nonferrous Met Soc China, 2008; 18: 248
[15] Jiang J, Godfrey A, Liu W, Liu Q. Mater Sci Eng, 2008; A483–484: 576
[16] Hu J. PhD Thesis, Shanghai Jiao Tong University, 2004
(胡静. 上海交通大学博士学位论文, 2004)
