2195铝锂合金平面应变热压缩行为
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摘要
2195铝锂合金被认为是航空航天领域的理想结构材料,但对其热变形行为的研究却相对较少。本工作通过平面应变热压缩试验,研究了2195铝锂合金的热变形行为,变形温度为400~500℃,应变速率为0.01~10 s~(-1)。研究表明,材料变形呈稳态流变特征,随变形温度增高和应变速率降低,流变应力逐渐减小,合金具有正应变速率敏感性。建立了2195铝锂合金材料本构方程,其激活能值为214.937 k J/mol。通过分析加工图,得到材料的适宜加工区为应变速率接近0.01 s~(-1),温度为475~500℃。最后通过分析动态软化过程中的应力规律,得到了材料软化机制判定方程。
2195 Al-Li alloy was identified as an ideal construction material for aerospace field, but researches on its hot deformation behavior were quiet rare. In this study, isothermal compression tests were conducted at Gleeble-3500 thermal mechanical simulator in the temperature range from 400 ℃ to 500 ℃ and strain rate range from 0.01 s~(-1) to 10 s~(-1). Results show that flow stress reaches its minimum under the condition of high temperature and low strain rate. Furthermore, constitutive equation was established to describe the flow stress and the hot deformation activation energy of 2195 Al-Li alloy is 214.937 k J/mol. By analyzing the processing map, the optimum processing parameters are obtained, i.e. temperature between 475 ℃ to 500 ℃, strain rate close to 0.01 s~(-1). It is quite convenient to estimate DRX behavior through a judgment equation of dynamic recrystallization.
2195 Al-Li alloy was identified as an ideal construction material for aerospace field, but researches on its hot deformation behavior were quiet rare. In this study, isothermal compression tests were conducted at Gleeble-3500 thermal mechanical simulator in the temperature range from 400 ℃ to 500 ℃ and strain rate range from 0.01 s~(-1) to 10 s~(-1). Results show that flow stress reaches its minimum under the condition of high temperature and low strain rate. Furthermore, constitutive equation was established to describe the flow stress and the hot deformation activation energy of 2195 Al-Li alloy is 214.937 k J/mol. By analyzing the processing map, the optimum processing parameters are obtained, i.e. temperature between 475 ℃ to 500 ℃, strain rate close to 0.01 s~(-1). It is quite convenient to estimate DRX behavior through a judgment equation of dynamic recrystallization.
引文
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[2]Huo Hongqing(霍红庆),Hao Weixin(郝维新),Gemg Guihong(耿桂宏)et al.Vacuum and Cryogenics(真空与低温)[J],2005(2):63
[3]Jiang Na(蒋呐),Li Jingfeng(李劲风),Zheng Ziqiao(郑子樵)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2007,36(6):949
[4]Han Dongfeng(韩冬峰),Zheng Ziqiao(郑子樵)Jiang Na(蒋呐)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2004,14(12):2090
[5]Mohebbi M S,Akbarzadeh A,Yoon Y O et al.Materials Science and Engineering A[J],2014,593:136
[6]Cheng L,Xue X,Tang B et al.Materials Science and Engineering A[J],2014,606:24
[7]Yabe S,Terano M,Yoshino M.Procedia Engineering[J],2014,81:1342
[8]Sah J P,Richardson G J,Sellars C M.Indian Journal of Technology[J],1973,11(10):445
[9]Puchi E S,Staia M H.Metallurgical and Materials Transactions A[J],1998,29(9):2345
[10]Airod A,Vandekinderen H,Barros J et al.Journal of Materials Processing Technology[J],2003,134(3):398
[11]Wright R N,Paulson M S.Journal of Materials Processing Technology[J],1998,80:556
[12]Masataka Tokuda,Tadashi Inaba,Hiroyuki Ohigashi et al.Int J Mechan Sci[J],2001,43(9):2035
[13]Liu Wenyi(刘文义).Thesis for Doctor(博士论文)[D].Chongqing:Chongqing University,2014
[14]Chakravartty J K,Prasad Y,Asundi M K.Metallurgical and Materials Transactions A[J],1991,22(4):829
[15]Prasad Y,Seshacharyulu T.International Materials Reviews[J],1998,43(6):243
[16]Liang Houquan(梁后权),Guo Hongzhen(郭鸿镇),Ning Yongquan(宁永权)et al.Acta Metallurgica Sinica(金属学报)[J],2014,50(7):871
[17]Liang H Q,Nan Y,Ning Y Q et al.Journal of Alloys and Compounds[J],2015,632:478
[18]Cao Jinrong(曹金荣),Liu Zhengdong(刘正东),Cheng Shichang(程世长).Acta Metallurgica Sinica(金属学报)[J],2007,43(1):35
[19]Stewart G R,Jonas J J,Montheillet F.ISIJ International[J],2004,44(9):1581
[20]Poliak E I,Jonas J J.Acta Material[J],1996,44(1):127
[21]Huang Guangsheng(黄光胜),Wang Lingyun(汪凌云),Huang Guangjie(黄光杰).Metal Forming Technology(金属成形工艺)[J],2004,24(2):41