连续柱状晶Cu-ECAP中的晶界演变及其与剪切带的交互作用

doi:10.11896/cldb.18100209

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Abstract The shear band of metals formed during plastic deformation will be divided into a twinning and matrix lamellar structure under high strain condition, and the nano-scale twin boundary can achieve a high degree of matching between strength and plasticity of metals. Accordingly, it will provide an effective support for the strength and plasticity matching of materials through studying the formation and action of shear bands by means of equal channel angular extrusion (ECAP) technique. In this work, one pass ECAP was conducted on the continuous columnar crystal pure Cu with special grain boundary angle, the evolution of grain boundary during deformation was studied, the formation mechanism of shear band as well as its interaction with grain boundary during deformation were analyzed, and the mechanical properties of samples with different orie-ntations were tested. As could be seen from the results, after ECAP deformation, the 0° grain boundary was bent, the grain boundary at the inner corner rotated 50° clockwise, 30° grain boundary rotated 5° clockwise, 45° grain boundary was also bent and showed a "spoon" shape, the center of 60° grain boundary was bent, and there was no deformation occurred at 90° grain boundary. Multiple stress regions with diverse stress states appeared during the deformation process of the sample. Alternating action of various stresses brought about the nonuniform strain distribution during the deformation process, resulting in great differences in macroscopic deformation. The tensile test results indicated that the crystal with 0° grain boundary possessed the highest tensile strength of 325 MPa, followed by the crystal with 45° grain boundary (295 MPa), and the crystal with 60° grain boundary held the lowest tensile strength of 230 MPa. A large number of shear bands were formed in the grains after deformation, and the interaction between the shear bands and the grain boundary results in the bending of the grain boundary. The difference of grain orientation and grain boundary angle between the shear band and the grain boundary is one of the factors that cause the great difference in tensile strength after deformation.

Key words： continuous columnar crystal copper equal channel angular pressing grain boundary evolution shear behavior

Published: 16 September 2019

CLC number:

TG379

Fund:This work was financially supported by the National Natural Science Foundation of China (51861022, 51261016).

About author:: Tingbiao Guoreceived his Ph.D. degree in Lanzhou University of Technology in 2010.He is currently an associate professor in Lanzhou University of Technology and his research interests are strengthening and toughening control of metal materials by severe plastic defor-mation (SPD).

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	GUO Tingbiao
	WEI Shiru
	WU Yibo
	WANG Bing
	MA Di

Cite this article:

GUO Tingbiao,WEI Shiru,WU Yibo, et al. Grain Boundary Evolution and Its Interaction with Shear Band in Continuous Columnar Crystal Cu-ECAP[J]. Materials Reports, 2019, 33(22): 3777-3782.

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http://www.mater-rep.com/EN/10.11896/cldb.18100209 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3777

[1]	An X H, Han W Z, Huang C X, et al. Applied Physics Letters, 2008, 92(20), 103.
[2]	Gao L, Chen R S, Han E H. Journal of Alloys & Compounds, 2009, 481(1-2), 379.
[3]	Lu K, Lu L, Suresh S. Science, 2009, 324(5925), 349.
[4]	Ning Y T, Zhang X H, Wu Y J. Chinese Journal of Nonferrous Metals, 2007, 17(1), 68(in Chinese).宁远涛, 张晓辉, 吴跃军. 中国有色金属学报, 2007, 17(1), 68.
[5]	Wang Y M, Ma E. Acta Materialia, 2004, 52(6), 1699.
[6]	Zhao Y H, Zhu Y T, Liao X Z, et al. Applied Physics Letters, 2006, 89(12), 887.
[7]	Lu L, Lu K. Science, 2004, 304(5669), 422.
[8]	Lu L, Lu K. Acta Metallurgica Sinica, 2010(11), 1422(in Chinese).卢磊, 卢柯. 金属学报, 2010(11), 1422
[9]	Lu L, Chen X H, Huang X X, et al. China Basic Science, 2010, 12(1), 16(in Chinese).卢磊, 陈先华, 黄晓旭, 等. 中国基础科学, 2010, 12(1), 16.
[10]	Tao N R, Lu K. Acta Metallurgica Sinica, 2014, 50(2), 141(in Chinese).陶乃镕, 卢柯. 金属学报, 2014, 50(2), 141.
[11]	An X H, Wu S D, Zhang Z F. Acta Metallurgica Sinica, 2014, 50(2), 191(in Chinese).安祥海,吴世丁,张哲峰.金属学报, 2014, 50(2), 191.
[12]	Wu S D, An X H, Han W Z, et al. Acta Metallurgica Sinica, 2010, 46(3), 257(in Chinese).吴世丁, 安祥海, 韩卫忠等. 金属学报, 2010, 46(3), 257.
[13]	Purcek G, Yanar H, Demirtas M, et al. Materials Science & Engineering A, 2016, 649(1), 114.
[14]	Tao N R, Lu K. Scripta Materialia, 2009, 60(12), 1039.
[15]	Guo T B, Li Q, Wang C, et al. Acta Metallurgica Sinica, 2017, 53(8), 991(in Chinese).郭廷彪, 李琦, 王晨, 等. 金属学报, 2017, 53(8), 991.
[16]	Wei W, Wang S L, Wei K X, et al. Journal of Alloys & Compounds, 2016, 678, 506.
[17]	Gu Y X, Ma A B, Jiang J H, Li H Y, Song D, er al. Materials Characterization,2018,138, 38.
[18]	Kommel L, Hussainova I, Volobuev O. Materials & Design, 2007, 28(7), 2121.
[19]	Li Y, Li S X, Li G Y. Acta Metallurgica Sinica, 2002, 38(8), 819(in Chinese).李勇, 李守新, 李广义. 金属学报, 2002, 38(8), 819.
[20]	Xu Y B, Bai Y L. Advances in Mechanics, 2007, 37(4), 496(in Chinese).徐永波,白以龙. 力学进展, 2007, 37(4), 496.
[21]	Gao Y J, Lu C J, Huang L L, et al. Acta Metallurgica Sinica, 2014, 50(1), 110(in Chinese).高英俊, 卢成健, 黄礼琳, 等. 金属学报, 2014, 50(1), 110.
[22]	Wang Q J, Xu C Z, Zheng M S, et al. Acta Metallurgica Sinica, 2007, 43(5), 498(in Chinese).王庆娟, 徐长征, 郑茂盛, 等. 金属学报, 2007, 43(5), 498.
[23]	Hiroyuki Miyamoto,Takumi Ikeda, et al. Materials Science & Enginee-ring A, 2011, 528(6), 2602.
[24]	Wang W Y, Pan Q L, Wang X D,et al. Materials Science & Engineering A,2018,731 195.