2E12铝合金热变形过程中的动态软化机制
Dynamic Softening Mechanism of 2E12 Aluminum Alloy during Hot Deformation
摘 要
用Gleeble-1500型热模拟试验机对2E12铝合金进行了等温热压缩试验, 对热变形后的显微组织进行了透射电镜和场发射扫描电镜观察, 研究了2E12合金在不同条件下热变形过程中的动态软化机制及其显微组织演化规律。结果表明: 在变形温度不高于400 ℃时, 合金的主要动态软化机制为动态回复; 而当变形温度不低于450 ℃时, 其主要的动态软化机制为连续动态再结晶, 亚晶扭转合并为动态再结晶的主要形核机制, 且沿原始晶界优先形核。
显微组织
动态软化机制
热变形
2E12 aluminum alloy
microstructure
dynamic softening mechanism
hot deformation
Abstract
Isothermal hot compression test of 2E12 aluminum alloy was operated on Gleeble-1500 thermal simulation test machine. Microstructure after hot deformation of the alloy was observed by TEM and FE-SEM. Dynamic softening mechanism and microstructure evolution regular of the alloy during hot deformation under different conditions were studied. The results show that when deformation temperature was below 400 ℃, the main softening mechanism of the alloy was the dynamic recovery. When deformation temperature was above 450 ℃, the major softening mechanism was continuous dynamic recrystallization(CDRX). The major nucleation mechanism of the alloy dynamic recrystallization was subgrain turning merging and alloy nucleated preferentially along original grain boundary.
中图分类号 TG146.21
所属栏目
基金项目 国家重点基础研究发展规划项目(2005CB623705); 国家自然科学基金资助项目(50871123)
收稿日期 2010/9/22
修改稿日期 2011/6/2
网络出版日期
作者单位点击查看
备注黄裕金(1985-),男, 江西上饶人, 硕士研究生。
引用该论文: HUANG Yu-jin,CHEN Zhi-guo. Dynamic Softening Mechanism of 2E12 Aluminum Alloy during Hot Deformation[J]. Materials for mechancial engineering, 2011, 35(10): 22～27
黄裕金,陈志国. 2E12铝合金热变形过程中的动态软化机制[J]. 机械工程材料, 2011, 35(10): 22～27
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参考文献
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【4】MCQUEEN H J, POSCHMANN I. Subgrain development in hot working of Al and Al-5Mg[J].Materials Science and Engineering A,1997,234/236:830-833.
【5】BAXTER G J, FURU T, ZHU Q,et al. The influence of transient strain-rate deformation conditions on the deformed microstructure of aluminum alloy Al-1%Mg [J].Acta Mater,1999,47(8):2367-2376.
【6】FURU T, SHERCLIFF H R, BAXTER G J,et al. The influence of transient deformation conditions on recrystallization during thermomechanical processing of Al-1%Mg alloy[J].Acta Materialia,1999,47(8):2377-2389.
【7】BLUM W, ZHU Q, MERKEL R,et al. Geometric dynamic recrystallization in hot torsion of Al-5Mg-0.6Mn (AA5083)[J].Materials Science and Engineering A,1996,205:23-30.
【8】GOURDET S, MONTHEILLET F. A model of continuous dynamic recrystallization[J].Acta Materialia,2003,51:2685-2699.
【9】SAKAI T, MIURA H, GOLOBRODKO A,et al. Continuous dynamic recrystallization during the transient severe deformation of aluminum alloy 7475[J].Acta Materialia,2009,57(1):153-163.
【10】KAIBYSHEV R, SITDIKOV O, GOLOBORODKO A,et al. Grain refinement in as-cast 7475 aluminum alloy under hot deformation[J].Materials Science and Engineering A,2003,344:348-356.
【11】ZHOU Jian, ZHANG Ting-jie, ZHANG Xiao-ming,et al. The influence of strain rate and solution treatment on dyna-mic recrystallization for 7075 aluminum alloy[J].Rare Metal Materials and Engineering,2004,33(6):580-584.
【12】HU H E, ZHEN L, ZHANG B Y,et al. Microstructure characterization of 7050 aluminum alloy during dynamic recrystallization and dynamic recovery[J].Materials Characterization,2008,59:1185-1189.
【13】万菊林,孙新军,顾家琳,等.Al-Cu-Mg-Zn-Cr合金热扭转变形中连续动态再结晶机理[J].金属学报,1999,35(10):1031-1035.
【14】WOJCIECHOWSKI S. New trends in the development of mechanical engineering materials[J].Journal of Materials Processing Technology,2000,106:230-235.
【15】SRIVATSAN T S, KOLAR D, MAGNUSEN P. The cyclic fatigue and final fracture behavior of aluminum alloy 2524[J].Materials and Design,2002,23:129-139.
【16】陈文.先进铝合金在A380上的应用[J].航空维修与工程,2005(2):41-42.
【17】WARNER T. Recently-developed aluminum solutions for aerospace applications[J].Materials Science Forum,2006,519/521:1271-1278.
【18】SRIVATSAN T S, KOLAR D, MAGNUSEN P. Influence of temperature on cyclic stress response, strain resistance, and fracture behavior of aluminum alloy 2524[J].Materials Science and Engineering A,2001,314:118-130.
【19】杨胜,易丹青,姚素娟,等.温度对2E12铝合金疲劳性能与断裂机制的影响[J].航空材料学报,2007,27(6):9-13.
【20】杨胜,易丹青,姚素娟,等.腐蚀环境下2E12航空铝合金疲劳裂纹扩展行为研究[J].材料工程,2007(12):26-34.
【21】杨胜,易丹青,姚素娟,等.热处理对2E12铝合金耐腐蚀性及力学性能的影响[J].金属热处理,2007,32(9):9-13.
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【23】李海,郑子樵,魏修宇,等.时效析出对2E12铝合金疲劳断裂行为的影响[J].中国有色金属学报,2008,18(4):589-594.
【24】李海,王芝秀,魏修宇,等.固溶处理时间对2E12铝合金组织和疲劳性能的影响[J].航空学报,2009,30(1):148-152.
【25】李俊鹏, 沈健, 闫晓东, 等.温度对7075铝合金热变形显微组织演化的影响[J].中国有色金属学报,2008,18(11):1951-1957.
【26】GALIYEV A, KAIBYSHEV R, GOTTSTEIN G. Correlation of plastic deformation and dynamic recystallization in magnesium alloy ZK60[J].Acta Materialia,2001,49:1199-1207.
【27】HUMPHERYS H J, HATHERLY M. Recrystallization and related annealing phenomena[M].Oxford: Elsevier Press,2004.
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