压缩载荷下织构对冷轧和退火Cu板力学行为各向异性的影响
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摘要
分别沿与具有一定初始织构的冷轧和退火Cu板轧向成0°,45°和90°方向取圆柱形试样(样品编号分别为RD-0°,RD-45°和RD-90°),利用Instron电子拉伸机和Split-Hopkinson压杆实验装置,研究织构多晶Cu板压缩力学行为的各向异性。将样品的初始织构用欧拉空间里的一系列分立取向表示,基于多晶体塑性变形模型,定量计算不同方向压缩变形所需外力强度因子。研究结果表明:退火织构多晶Cu板各方向压缩力学行为非常接近,近似为各向同性;冷轧织构多晶Cu板准静态和动态压缩力学行为均呈现出明显的各向异性,RD-90°样品的屈服强度和流变应力最大,RD-45°的其次,RD-0°的最小;外力强度因子可较好地用于解释织构多晶Cu板力学行为各向异性。
Cylindrical specimens of cold rolled and annealed Cu sheets with initial textures were obtained along the 0°,45° and 90° directions(the samples were marked as RD-0°, RD-45°, RD-90°, respectively). The samples were compressed by means of Instron apparatus and Split-Hopkinson pressure bar technology, respectively. The quasi-static and dynamic compressive mechanical behavior anisotropy of textured polycrystalline Cu sheets was investigated. The results show that compressive mechanical behaviors of annealed sheet for different directions samples display little difference. In contrast, the behaviors of cold-rolled Cu sheet exhibits pronounced anisotropy, both the yield strength and flow stress for the RD-90° sample are the maximum while those for the RD-0° sample are the minimum. The initial textures of the cold-rolled and anneal sheets are transformed into a series of individual orientations in Euler space,respectively. The strength factors for different orientations are calculated based on the polycrystalline deformation model.The results can qualitatively explain the strength difference among different directions of textured polycrystalline Cu sheets.
Cylindrical specimens of cold rolled and annealed Cu sheets with initial textures were obtained along the 0°,45° and 90° directions(the samples were marked as RD-0°, RD-45°, RD-90°, respectively). The samples were compressed by means of Instron apparatus and Split-Hopkinson pressure bar technology, respectively. The quasi-static and dynamic compressive mechanical behavior anisotropy of textured polycrystalline Cu sheets was investigated. The results show that compressive mechanical behaviors of annealed sheet for different directions samples display little difference. In contrast, the behaviors of cold-rolled Cu sheet exhibits pronounced anisotropy, both the yield strength and flow stress for the RD-90° sample are the maximum while those for the RD-0° sample are the minimum. The initial textures of the cold-rolled and anneal sheets are transformed into a series of individual orientations in Euler space,respectively. The strength factors for different orientations are calculated based on the polycrystalline deformation model.The results can qualitatively explain the strength difference among different directions of textured polycrystalline Cu sheets.
引文
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[23]CHEN Zhiyong,ZHANG Xinming,LIU Chuming,et al.Co-yield surfaces for{111}?110?slip and{111}?112?twinning in fcc metals[J].Journal of Materialia Science,2002,37(13):2843-2848.
[2]H?RNQVISTA M,MORTAZAVI N,HALVARSSON M,et al.Deformation and texture evolution of OFHC copper during dynamic tensile extrusion[J].Acta Materialia,2015,89:163-180.
[3]YAO B,HAN Z,LI Y S,et al.Dry sliding tribological properties of nanostructured copper subjected to dynamic plastic deformation[J].Wear,2011,271(9/10):1609-1616.
[4]LIN Fengxiang,ZHANG Yubin,TAO Nairong,et al.Effects of heterogeneity on recrystallization kinetics of nanocrystalline copper prepared by dynamic plastic deformation[J].Acta Materialia,2014,72:252-261.
[5]STEVENSON M E,JONES S E,BRADT R C.The high strain rate dynamic stress-strain curve for OFHC copper[J].Materials Science Research International,2003,9(3):187-195.
[6]MEYERS M A,ANDRADE U R,CHOKSHI A R.The effect of grain size on the high-strain,high-strain-rate behavior of copper[J].Metallurgical and Materials Transaction A,1995,26(11):2881-2893.
[7]NEMAT-NASSER S,LI Y L.Flow stress of fcc polycrystals with application to OFHC Cu[J].Acta Materialia,1998,46(2):565-577.
[8]ALEXANDER D J,BEYERLEIN I J.Anisotropy in mechanical properties of high-purity copper processed by equal channel angular extrusion[J].Materials Science and Engineering A,2005,410/411:480-484.
[9]LI Y S,TAO N R,LU K.Microstructural evolution and nanostructure formation in copper during dynamic plastic deformation at cryogenic temperatures[J].Acta Materialia,2008,56(2):230-241.
[10]LI Y S,ZHANG Y,TAO N R,et al.Effect of thermal annealing on mechanical properties of a nanostructured copper prepared by means of dynamic plastic deformation[J].Scripta Materialia,2008,59(4):475-478.
[11]MISHRA A,MARTIN M,THADHANI N N,et al.High-strain-rate response of ultra-fine-grained copper[J].Acta Materialia,2008,56(12):2770-2783.
[12]陈志永,才鸿年,王富耻,等.冷轧Cu板动态压缩力学性能各向异性的研究[J].金属学报,2009,45(2):143-150.CHEN Zhiyong,CAI Hongnian,WANG Fuchi,et al.Investigation on anisotropy of dynamic compressive mechanical properties of cold-rolled Cu sheet[J].Acta Metallurgica Sinica,2009,45(2):143-150.
[13]TANG Lin,CHEN Zhiyong,ZHAN Congkun,et al.Microstructural evolution in adiabatic shear bands of copper at high strain rates:electron backscatter diffraction characterization[J].Materials Characterization,2012,64:21-26.
[14]TANG Lin,CHEN Zhiyong,ZHAN Congkun,et al.Microstructure and microtexture evolution of shear localization in dynamic deformation with different strains in annealed copper[J].Metallurgical and Materials Transactions A,2013,44(2):793-805.
[15]MA Zhichao,ZHAO Hongwei,LU Shuai,et al.Effects of zinc on static and dynamic mechanical properties of copper-zinc alloy[J].Journal of Central South University,2015,22(7):2440-2445.
[16]MAO Z N,AN X H,LIAO X Z,et al.Opposite grain size dependence of strain rate sensitivity of copper at low vs high strain rates[J].Materials Science&Engineering A,2018,738:430-438.
[17]BUNGE H J.Texture analysis in materials science-mathematical methods[M].London:Butterworths Press,1982:47-90.
[18]LüKE K,POSPIECH J,VIRHICH K H,et al.On the problem of the reproduction of the true orientation distribution from pole figures[J].Acta Metallurgica,1981,29(1):167-185.
[19]SACHS E Z.Zur ableitung einer fliessbedingung[J].Zeitschrift Verein Deutsche Ingen,1928,72:734-736.
[20]TAYLOR G I.Plastic strain in metals[J].Journal of the Institute of Metal,1938,62:307-324.
[21]BISHOP J F W,HILL R.A theory of the plastic distortion of a polycrystalline aggregate under combined stresses[J].Philosophical Magazine,1951,42(327):414-427.
[22]BISHOP J F W,HILL R.A theoretical derivation of the plastic properties of a polycrystalline face-centred metal[J].Philosophical Magazine,1951,42(334):1298-1307.
[23]CHEN Zhiyong,ZHANG Xinming,LIU Chuming,et al.Co-yield surfaces for{111}?110?slip and{111}?112?twinning in fcc metals[J].Journal of Materialia Science,2002,37(13):2843-2848.