热轧Al- Mg- Si合金厚度方向显微组织及织构梯度演化
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摘要
通过拉伸试验、扫描电镜(SEM)、透射电镜(TEM)、 X射线衍射(XRD)等研究Al-Mg-Si热轧板材沿厚度方向显微结构及织构的变化,结果表明织构类型沿表层至中心层出现明显的变化,表层主要为剪切织构r-cube{001}<110>;中心层表现出明显的平面应变织构特征,主要为沿着β取向线的C{112}<111>, S{123}<634>和B{011}<211>织构;过渡层由于粒子诱导形核(PSN)效应,再结晶晶粒倾向于沿着大尺度第二相粒子形核长大,使晶粒择优取向性减弱,造成织构取向密度的强散射和random织构P的生成。Cube织构在平面应变条件下更容易发生,中心层cube织构的形成是由于再结晶晶核与S变形织构存在着40°<111>的特殊位向关系,择优生长模型认为晶界具有很高的迁移速度,发生择优生长,吞并相邻的S织构。
The textures and microstructure evolution along thickness direction in an Al-Mg-Si aluminum alloy thick sheet were studied through mechanical property tests, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD) measurements. The results revealed that the texture types were quite different from surface to center. The shear texture components r-cube {001}<110> mainly existed in the surface layer. However, the plane strain textures belonged to β fiber including C{112}<111>, S{123}<634> and B{011}<211> dominated the center layer. It was generally accepted that the recrystallization grains in the transition layer were inclined to nucleate and grow taking along micro-scale particles due to precipitation simulate nucleation(PSN) effects during hot rolling process, which induced the strong radiation of orientation densities and the occurrence of random textures P{011}<122>. In addition, the formation ofcube textures in the center layer were attributed to the nearly 40°<111> misorientation between S components and cube oriented recrystallization grains. The micro-growth model(OG) predicted that such grain boundaries with this misorientation appeared to have high mobility, enabling them to gain a local size advantage as compared to any alternative non-cube nuclei and took possession of adjacent S texture components.
The textures and microstructure evolution along thickness direction in an Al-Mg-Si aluminum alloy thick sheet were studied through mechanical property tests, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD) measurements. The results revealed that the texture types were quite different from surface to center. The shear texture components r-cube {001}<110> mainly existed in the surface layer. However, the plane strain textures belonged to β fiber including C{112}<111>, S{123}<634> and B{011}<211> dominated the center layer. It was generally accepted that the recrystallization grains in the transition layer were inclined to nucleate and grow taking along micro-scale particles due to precipitation simulate nucleation(PSN) effects during hot rolling process, which induced the strong radiation of orientation densities and the occurrence of random textures P{011}<122>. In addition, the formation ofcube textures in the center layer were attributed to the nearly 40°<111> misorientation between S components and cube oriented recrystallization grains. The micro-growth model(OG) predicted that such grain boundaries with this misorientation appeared to have high mobility, enabling them to gain a local size advantage as compared to any alternative non-cube nuclei and took possession of adjacent S texture components.
引文
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[18] Samajdar I,Dohery R D.Role of S[{123}<634>] orientations in the preferred nucleation of cube grains in recrystallization of fcc metals [J].Scripta Metallurgica et Materialia,1995,36(2):845.
[19] Kamikawa N,Tsuji N,Huang X,Hansen N.Through-thickness characterization of microstructure and texture in high purity aluminum processed to high strain by accumulative roll-bonding [J].Materials Transactions,2007,48(8):1978.
[20] Engler O,Hirsch J.Texture control by thermomechanical processing of AA6xxx Al-Mg-Si sheet alloys for automotive applications-a review [J].Materials Science and Engineering:A,2002,336(-1-2):249.
[21] Chen J Z,Zhen L,Shao W Z,Dai L S,Cui Y X.Through-thickness texture gradient in AA 7055 aluminum alloy [J].Materials Letters,2008,62(1):88.
[22] Huh M Y,Cho Y S,Engler O.Effect of lubrication on the evolution of microstructure and texture during rolling and recrystallization of copper [J].Materials Science and Engineering:A,1998,247(1):152.
[23] Vandermeer R A,Bernal J B.Deformation zone geometry and texture gradients in cold-rolled niobium [J].Texture,Stress,and Microstructure,1977,2(3):183.
[24] Humphreys F J.The nucleation of recrystallization at second phase particles in deformed aluminium [J].Acta Metallurgica,1977,25(11):1323.
[25] Engler O.On the influence of dispersoids on the particle stimulated nucleation of recrystallization in an Al-Fe-Si model alloy [Z].Trans.Tech.Publications,1998.483.
[26] Davies R K,Randle V,Marshall G J.Continuous recrystallization-related phenomena in a commercial Al-Fe-Si alloy [J].Acta Materialia,1998,46(17):6021.
[27] Bennett T A,Petrov R H,Kestens L A I.Effect of particles on texture banding in an aluminium alloy [J].Scripta Materialia,2010,62(2):78.
[28] Oscarsson A.The effect of nucleation sites for recrystallization on annealing texture and earing in aluminum [J].Textures and Microstructures,1991,14-18:477.
[29] Li Q,Tang G B,Liu Z D,Tian Z L.Analysis of nonuniform strain in hot strip rolling deformation process [J].Journal of Iron and Steel Research,2007,19(6):52.(李权,唐广波,刘正东,田志凌.板带热轧变形过程中的非均匀应变问题分析 [J].钢铁研究学报,2007,19(6):52)
[30] Duggan B J,Lucke K,Kohlhoff G,Lee C S.On the origin of cube texture in copper [J].Acta Metallurgica et Materialia,1993,41(6):1921.
[2] Hansen N,Mehl R F.New discoveries in deformed metals [J].Metallurgical and Materials Transactions A,2001,32(12):2917.
[3] Engler O,Randle V.Introduction to Texture Analysis:Macrotexture,Microtexture,and Orientation Mapping [M].USA:CRC Press,2009.126.
[4] Lankford W T.New criteria for predicting the press performance of deep drawing sheets [J].Trans.ASM,1950,42:1197.
[5] Miszczyk M M,Paul H,Driver J H,Poplewska J.The influence of deformation texture on nucleation and growth of cube grains during primary recrystallization of AA1050 alloy [J].ActaMaterialia,2017,129:378.
[6] Vatne H E,Orsund R,Marthinsen K,Nes E.Modeling recrystallization kinetics,grain sizes,and textures during multipasshot rolling [J].Metallurgiacl and Materials Transactions A,1996,27A:4133.
[7] Vasudevan A K,Fricke W G,Malcolm R C,Bucci R J,Przystupa M A,Barlat F.On through thickness crystallographic texture gradient in Al-Li-Cu-Zr alloy [J].Metallurgical Transactions A,1988,19A:731.
[8] Chen J Z,Zhen L,Dai S L,Shao W Z,Zhang B Y.Effects of grain shape and texture on the through-thickness yield strength of AA 7055 aluminum alloy plate [J].Rare Metals Materials and Engineering,2008(11):1966.(陈军洲,甄良,戴圣龙,邵文柱,张宝友.晶粒形貌及织构对AA 7055铝合金板材不同厚度层屈服强度的影响 [J].稀有金属材料与工程,2008(11):1966.)
[9] Wang S M,Wang C Q,Du Z W,Sun Z M.Texture analysis for 7B04 Al alloy plate along thickness direction [J].Chinese Journal of Rare Metals,2012,(3):363.(王书明,王超群,杜志伟,孙泽明.7B04铝合金织构沿厚度变化的研究 [J].稀有金属,2012,(3):363.)
[10] Speich G R,Fisher R M.Recrystallization,Grain Growth and Textures [M].American:ASM International,1966.563.
[11] Vatne H E,Furu T,Nes E.Nucleation of recrystallised grains from cube bands in hot deformed commercial purity aluminium [J].Materials Science and Technology,1996,12(3):201.
[12] Dalland O,Nes E.Origin of cube texture during hot rolling of commercial Al-Mn-Mg alloys [J].Acta Materialia,1996,44(4):1389.
[13] Jin Q,Shim S,Lim S.Correlation of microstructural evolution and formation of basal texture in a coarse grained Mg-Al alloy during hot rolling [J].Scripta Materialia,2006,55(9):843.
[14] Li J C M.Possibility of subgrain rotation during recrystallization [J].Journal of Applied Physics,1962,33(10):2958.
[15] Hirsch J,L U Cke K.Overview no.76:Mechanism of deformation and development of rolling textures in polycrystalline fcc metals-I.Description of rolling texture development in homogeneous CuZn alloys [J].Acta Metallurgica,1988,36(11):2863.
[16] Ridha A A,Hutchinson W B.Recrystallisation mechanisms and the origin of cube texture in copper [J].Acta Metallurgica,1982,30(10):1929.
[17] Duggan B J,L U Cke K,Kohlhoff G,Lee C S.On the origin of cube texture in copper [J].Acta Metallurgica et Materialia,1993,41(6):1921.
[18] Samajdar I,Dohery R D.Role of S[{123}<634>] orientations in the preferred nucleation of cube grains in recrystallization of fcc metals [J].Scripta Metallurgica et Materialia,1995,36(2):845.
[19] Kamikawa N,Tsuji N,Huang X,Hansen N.Through-thickness characterization of microstructure and texture in high purity aluminum processed to high strain by accumulative roll-bonding [J].Materials Transactions,2007,48(8):1978.
[20] Engler O,Hirsch J.Texture control by thermomechanical processing of AA6xxx Al-Mg-Si sheet alloys for automotive applications-a review [J].Materials Science and Engineering:A,2002,336(-1-2):249.
[21] Chen J Z,Zhen L,Shao W Z,Dai L S,Cui Y X.Through-thickness texture gradient in AA 7055 aluminum alloy [J].Materials Letters,2008,62(1):88.
[22] Huh M Y,Cho Y S,Engler O.Effect of lubrication on the evolution of microstructure and texture during rolling and recrystallization of copper [J].Materials Science and Engineering:A,1998,247(1):152.
[23] Vandermeer R A,Bernal J B.Deformation zone geometry and texture gradients in cold-rolled niobium [J].Texture,Stress,and Microstructure,1977,2(3):183.
[24] Humphreys F J.The nucleation of recrystallization at second phase particles in deformed aluminium [J].Acta Metallurgica,1977,25(11):1323.
[25] Engler O.On the influence of dispersoids on the particle stimulated nucleation of recrystallization in an Al-Fe-Si model alloy [Z].Trans.Tech.Publications,1998.483.
[26] Davies R K,Randle V,Marshall G J.Continuous recrystallization-related phenomena in a commercial Al-Fe-Si alloy [J].Acta Materialia,1998,46(17):6021.
[27] Bennett T A,Petrov R H,Kestens L A I.Effect of particles on texture banding in an aluminium alloy [J].Scripta Materialia,2010,62(2):78.
[28] Oscarsson A.The effect of nucleation sites for recrystallization on annealing texture and earing in aluminum [J].Textures and Microstructures,1991,14-18:477.
[29] Li Q,Tang G B,Liu Z D,Tian Z L.Analysis of nonuniform strain in hot strip rolling deformation process [J].Journal of Iron and Steel Research,2007,19(6):52.(李权,唐广波,刘正东,田志凌.板带热轧变形过程中的非均匀应变问题分析 [J].钢铁研究学报,2007,19(6):52)
[30] Duggan B J,Lucke K,Kohlhoff G,Lee C S.On the origin of cube texture in copper [J].Acta Metallurgica et Materialia,1993,41(6):1921.
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