Cu-0.8Mg合金高温变形行为与机制
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摘要
利用Gleeble-1500D热模拟试验机对Cu-0.8Mg合金进行热变形试验,变形温度为500~850℃、应变速率为0.001~10 s-1,研究不同试验条件下合金流变应力的变化规律,分析合金的流变应力、应变速率和变形温度之间的关系,对合金的热加工图进行研究。结果表明:合金在热变形过程中,其流变应力曲线表现出典型的加工硬化、动态回复和再结晶特征,随着变形温度的升高和应变速率的降低,其流变应力和峰值应力也随之降低;合金热变形过程中的激活能为177.88 k J/mol,构建了合金的本构方程;合金在热变形过程中的最优加工参数为:变形温度为700~800℃、应变速率为0.01~0.1 s-1。
The isothermal compression test of Cu-0. 8 Mg alloy was carried out by using a Gleeble-1500 D thermal simulator in the temperature of 500-850 ℃ and strain rate of 0. 001-10 s-1. The variation rule of flow stress of the alloy under different experimental conditions was studied and the relationship among flow stress,strain rate and deformation temperature of the alloy was analyzed. The hot processing map of the alloy under different conditions was studied. The results show that the true stress-strain curves of the alloy show typical characteristics of work hardening,dynamic recovery and recrystallization during hot deformation,and with the increasing of deformation temperature and the decreasing of strain rate,the flow stress and peak stress decrease. The activation energy of hot deformation of the alloy is 177. 88 k J/mol,and the constitutive equation of the alloy is established. The optimum processing parameters of the alloy in the process of hot deformation are as follows: the deformation temperature is 700-800 ℃,and the strain rate is 0. 01-0. 1 s-1.
The isothermal compression test of Cu-0. 8 Mg alloy was carried out by using a Gleeble-1500 D thermal simulator in the temperature of 500-850 ℃ and strain rate of 0. 001-10 s-1. The variation rule of flow stress of the alloy under different experimental conditions was studied and the relationship among flow stress,strain rate and deformation temperature of the alloy was analyzed. The hot processing map of the alloy under different conditions was studied. The results show that the true stress-strain curves of the alloy show typical characteristics of work hardening,dynamic recovery and recrystallization during hot deformation,and with the increasing of deformation temperature and the decreasing of strain rate,the flow stress and peak stress decrease. The activation energy of hot deformation of the alloy is 177. 88 k J/mol,and the constitutive equation of the alloy is established. The optimum processing parameters of the alloy in the process of hot deformation are as follows: the deformation temperature is 700-800 ℃,and the strain rate is 0. 01-0. 1 s-1.
引文
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[2]雷静果,刘平,赵冬梅,等.用导电率研究Cu-Ni-Si-Cr合金时效早期相变动力学[J].材料热处理学报,2003,24(4):22-28.LEI Jing-guo,LIU Ping,ZHAO Dong-mei,et al.Study on the transformation kinetics of early stage aging of Cu-Ni-Si alloy by measuring the electric conductivity[J].Transactions of Materials and Heat Treatment,2003,24(4):22-28.
[3]Bi L M,Liu P,Chen X H,et al.Analysis of phase in Cu-15%Cr-0.24%Zr alloy[J].Transactions of Nonferrous Metals Society of China,2013,23(5):1342-1348.
[4]柴哲,张毅,李瑞卿,等.Cu-Cr-Zr-Y合金热压缩力学行为及热加工图[J].材料热处理学报,2015,36(6):226-231.CHAI Zhe,ZHANG Yi,LI Rui-qing,et al.Hot compression deformation behavior and processing map of Cu-Cr-Zr-Y alloy[J].Transactions of Materials and Heat Treatment,2015,36(6):226-231.
[5]胡勇,饶丽,黎秋萍.稀土Ce含量对AZ91D镁合金组织和性能的影响[J].材料热处理学报,2014,35(4):99-105.HU Yong,RAO Li,LI Qiu-ping.Effect of Ce content on microstructure and properties of AZ91D magnesium alloy[J].Transactions of Materials and Heat Treatment,2014,35(4):99-105.
[6]王永鹏,宋克兴,国秀花,等.高速电气化铁路接触导线的应用现状及研究进展[J].热加工工艺,2009,38(14):32-35.WANG Yong-peng,SONG Ke-xing,GUO Xiu-hua,et al.Application actuality and research progress of contact wire for high-speed electric railway[J].Hot Working Technology,2009,38(14):32-35.
[7]Zhang Y,Sun H L,Volinsky A A,et al.Small Y addition effects on hot deformation behavior of copper-matrix alloys[J].Advanced Engineering Materials,2017,19(12):1700197-1-10.
[8]邱正晓.铜镁合金接触线的工艺创新及技术优势分析[J].铁道建筑技术,2015(9):99-104.QIU Zheng-xiao.Technological innovation and analysis of technological advantages of Cu-Mg alloy contact wire[J].Railway Construction Technology,2015(9):99-104.
[9]蒋月月,王昭东,邓想涛.微量稀土Ce对中碳微合金钢连续冷却转变行为的影响[J].金属热处理,2017,42(12):57-60.JIANG Yue-yue,WANG Zhao-dong,DENG Xiang-tao.Effect of trace rare earth Ce on continuous cooling transformation behavior of microalloyed medium carbon steel[J].Heat Treatment of Metals,2016,41(9):57-60.
[10]朱承程,马爱斌,江静华,等.ECAP及后续退火对Cu-Mg合金组织与性能的影响[J].中国有色金属学报,2013,23(5):1331-1337.ZHU Cheng-cheng,MA Ai-bin,JIANG Jing-hua,et al.Microstructure and properties of Cu-Mg alloys processed by ECAP and subsequent annealing[J].The Chinese Journal of Nonferrous Metals,2013,23(5):1331-1337.
[11]Correia J B,Davies H A,Sellars C M.Strengthening in rapidly solidified age hardened Cu-Cr and Cu-Cr-Zr alloys[J].Acta Materialia,1997,45(1):177-185.
[12]李艳,刘勇,张毅,等.Cu-0.4Zr-0.15Ce合金热压缩力学行为及热加工图[J].中国稀土学报,2016,34(2):221-227.LI Yan,LIU Yong,ZHANG Yi,et al.Hot compression deformation behavior and processing map of Cu-0.4Zr-0.15Ce alloy[J].Journal of the Chinese Society of Rare Earths,2016,34(2):221-227.
[13]刘文,王梦寒,冉云兰.超高强度钢热成形冷却过程数值模拟[J].热加工工艺,2012,41(3):78-84.LIU Wen,WANG Meng-han,RAN Yun-lan.Numerical simulation of cooling process for hot forming ultrahigh strength steel[J].Hot Working Technology,2012,41(3):78-84.
[14]Sellars C M,Mc Tegart W J.On the mechanism of hot deformation[J].Acta Metallurgica,1966,14(9):1136-1142.
[15]Zener C,Hollomon J H.Effect of strain rate upon plastic flow of steel[J].Journal of Applied physics,1944,15(1):22-28.
[16]Sellars C M,Whiteman J A.Recrystallization and grain growth in hot rolling[J].Metal Science,1979,13(3/4):22-28.
[17]田卡,田保红,刘勇,等.铈对Cu-Zr合金热变形激活能和性能的影响[J].中国稀土学报,2016,34(4):432-438.TIAN Ka,TIAN Bao-hong,LIU Yong,et al.Effects of cerium on hot deformation activation energy and properties of Cu-Zr alloy[J].Journal of the Chinese Society of Rare Earths,2016,34(4):432-438.
[18]王志蒙,王玉辉,曹文全,等.GCr15轴承钢热变形行为及热加工图[J].材料热处理学报,2017,38(1):191-197.WANG Zhi-meng,WANG Yu-hui,CAO Wen-quan,et al.Hot deformation behavior and processing maps of GCr15 bearing steel[J].Transactions of Materials and Heat Treatment,2017,38(1):191-197.
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