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摘要：
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在Gleeble-1500热模拟机上对01570铝合金进行等温热压缩实验,变形温度为300~450℃,应变速率为0.001~1 s-1,研究其热压缩变形的流变应力行为。结果表明:01570铝合金真应力-应变曲线在变形温度为300℃,应变速率为0.01~1 s-1的条件下,流变应力开始随应变增加而增大,达到峰值后趋于平稳,表现出动态回复特征;而在其他条件下,应力达到峰值后随应变的增加而逐渐下降,表现出动态再结晶特征。在用Arrhenius方程描述01570铝合金热变形行为时,其变形激活能Q为152.33 kJ.mol-1。
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The flow stress behavior of 01570 aluminum alloy during hot compression deformation conditions was studied by isothermal hot compression on Gleeble-1500 hot simulation machine.The deformation temperature range was 300~450 ℃ and the strain rate range was 0.001~1 s-1.The experimental results indicate that the flow stress of 01570 aluminum alloy increases with increasing strain and tends to be constant after a peak value at temperature 300 ℃ and strain rates of 0.01~1 s-1,showing dynamic recover.The flow stress falls down after a peak value with the increasing strain at the other conditions,showing dynamic recrystallization.The deformation activation energy of 01570 aluminum alloy during hot deformation is 152.33 kJ·mol-1 from Arrhenius equation.
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基金项目：
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国家863计划项目(2006AA03Z523)
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作者简介：
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参考文献：
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[1]Filatov Y A,Yelagin V I,Zakharov V V.New Al-Mg-Scalloys[J].Materials Science and Engineering,2000,A280:97-101.
[2]潘清林,尹志民,邹景霞,等.微量Sc在Al-Mg合金中的作用[J].金属学报,2001,(07):749-753.
[3]Chen Xianming,Luo Chengping,Pan Qinglin.Effects ofmicro-alloying with Sc and Mn on microstructure and mechan-ical properties of Al-Mg based alloy[J].Trans.NonferrousMet.Soc.China,2005,15(5):1108-1112.
[4]魏华凯,胡芳友,管仁国.Al-Mg-Sc合金的组织和性能[J].特种铸造及有色合金,2006,26(11):739-742.
[5]Kaibyshev R,Avtokratova E,Apollonova A.High strainrate superplasticity in an Al-Mg-Sc-Zr alloy subjected to sim-ple thermomechanical processing[J].Scripta Materialia,2006,(54):2119-2124.
[6]Kendig K L,Miracle D B.Strengthening mechanisms of anAl-Mg-Sc-Zr alloy[J].Acta Materialia 2002,(50):4165-4175.
[7]赵卫涛,闰德胜,戎利建.变形Al-Mg-Sc-Zr合金退火组织的TEM观察[J].金属学报,2005,41(11):1150-1154.
[8]Poirier J P.晶体的高温塑性变形[M].关德林,译.大连:大连理工大学出版社,1989.
[9]沈健.2091铝合金高温塑性变形的研究[D].长沙:中南工业大学,1996.
[10]Jonas J,Sellars C M,Tegart W J.Strength and structureunder hot working condition[J].Int.Metal Reviews,1969,14(130):1-24.
[11]Sheppard T,Parson N C,Zaidi M A.Dynamic recrystalliza-tion in Al-7Mg[J].Met.Sci.,1983,17(10):481-490.
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