Cu-Cr-Zr合金高温热变形行为研究
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摘要
在Gleeble-1500D热模拟试验机上,采用高温等温压缩试验,对Cu-Cr-Zr合金在变形温度为600~800℃、应变速率为0.01~5 s~(-1)和总压缩应变量约50%条件下的热变形行为进行了研究。利用光学显微镜观察Cu-Cr-Zr合金在不同变形温度、不同应变速率下的显微组织,分析其组织演变规律。结果表明:应变速率和变形温度的变化强烈地影响合金流变应力的大小;Cu-Cr-Zr合金在热变形过程中发生了动态再结晶,且流变应力随变形温度升高而降低,随应变速率提高而增大;在应变温度为800℃时,合金热压缩变形流变应力出现了明显的峰值应力,表现为连续动态再结晶特征。从流变应力、应变速率和温度的相关性,得出了该合金热压缩变形时的热变形激活能Q和流变应力方程。
The hot deformation behavior of Cu-Cr-Zr alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500 D thermal-mechanical simulator at the temperature from 600 ℃ to800 ℃ and at the strain rate from 0.01 s~(-1)to 5 s~(-1) under the maximum strain of 50%. The microstructure of Cu-Cr-Zr alloy was observed under different deformation temperatures and strain rates, the microstructure evolution of Cu-Cr-Zr alloy was studied. The results show that the flow stress is strongly influenced both by deformation temperature and stain sate. The dynamic recrystallization occurred during the test. The flow stress decreases with the increase of deforming temperature, while increases with the increase of strain rate. When the deformation temperature is 800 ℃, the flow stress decreased after a peak value, showing continuous dynamic recrystallization. Both the hot deformation activation energy Q and constitutive equation were derived from the correlativity of flow stress, strain rate and temperature.
The hot deformation behavior of Cu-Cr-Zr alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500 D thermal-mechanical simulator at the temperature from 600 ℃ to800 ℃ and at the strain rate from 0.01 s~(-1)to 5 s~(-1) under the maximum strain of 50%. The microstructure of Cu-Cr-Zr alloy was observed under different deformation temperatures and strain rates, the microstructure evolution of Cu-Cr-Zr alloy was studied. The results show that the flow stress is strongly influenced both by deformation temperature and stain sate. The dynamic recrystallization occurred during the test. The flow stress decreases with the increase of deforming temperature, while increases with the increase of strain rate. When the deformation temperature is 800 ℃, the flow stress decreased after a peak value, showing continuous dynamic recrystallization. Both the hot deformation activation energy Q and constitutive equation were derived from the correlativity of flow stress, strain rate and temperature.
引文
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[3]李宝增,张红军,韩丽娟,等.Cu-0.8Cr-0.2Zr触头材料的组织与性能[J].特种铸造及有色合金,2015,35(2):137-139.
[4]张筱雯,王庆娟.Cu-Cr-Zr合金的析出相及物理性能研究进展[J].热加工工艺,2015,44(4):8-11.
[5]陈舸,张修庆,刘秋月,等.Cu-Cr-Zr合金多次大塑性变形热处理工艺的研究[J].热加工工艺,2015,44(6):173-176.
[6]王静怡,王庆娟,杜忠泽,等.Cu-Cr-Zr合金疲劳、蠕变性能研究现状[J].热加工工艺,2012,35(2):40-47.
[7]帅歌旺,江炳进,潘昌燃,等.热处理对点焊电极用Cxu-Cr-Zr-Ni-Si合金性能的影响[J].特种铸造及有色合金,2016,36(3):334-336.
[8]李瑞卿,田保红,张毅,等.Cu-Cr-Zr-Ce合金高温热变形行为研、[9]Rajamuthamilselvan M,Ramanathan S.Hot deformation behaviour of 7075 alloys[J].Journal of Alloys and Compounds,2011,509:948-952.
[10]Olofinjanaa A O,Tan K S.Achieving combined high strength and high conductivity in reprocessed Cu-Cr alloy[J].Journal of Achievement in Materials and Manufacturering Engineering,2009,35(1):14-20.
[11]王宏伟,易丹青,王斌,等.Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd镁合金的高温塑性变形行为的热压缩模拟[J].中国有色金属学报,2010,20(3):378-384.
[12]王静怡,王庆娟,杜忠泽.加工工艺对Cu-Cr-Zr合金热变形行为的影响[J].特种铸造及有色合金,2015,35(6):666-669.