高温、高应变率下TB6钛合金的动态压缩性能
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摘要
利用高温Hopkinson压杆试验系统,对TB6钛合金分别进行应变率为3000 s~(-1),不同温度下(550～850℃)的动态压缩力学性能测试,得到材料在不同温度和应变率耦合作用下的真应力-应变曲线,考察材料流动应力的温度和应变率敏感性。结果表明,在高应变率条件下,材料具有一定的应变率增强、增塑效应,随着温度的升高,塑性变形产生的绝热升温热软化作用增强,剪切带长度增加;材料在750℃表现出反常的应变率软化现象,剪切带分叉可能是造成强度下降的原因。
The dynamic compression mechanical properties test was conducted on TB6 titanium alloy under the strain rate of 3000 s~(-1) and different temperatures(550～850 °C) using high temperature Hopkinson pressure bar test system, and the true stress-strain curves of the material under the coupled action of different temperatures and strain rates were obtained. The temperature and strain rate sensitivity of flow stress for the material were investigated. The results show that under the condition of high strain rate, the material has a certain strain rate strengthening and plasticizing effect. With the increase of temperature, the effects of the thermal softening by adiabatic heating increase, and the length of shear zone increases. The material in 750 °C shows abnormal strain rate softening, and the shear band bifurcation may be the cause of strength decreasing.
The dynamic compression mechanical properties test was conducted on TB6 titanium alloy under the strain rate of 3000 s~(-1) and different temperatures(550～850 °C) using high temperature Hopkinson pressure bar test system, and the true stress-strain curves of the material under the coupled action of different temperatures and strain rates were obtained. The temperature and strain rate sensitivity of flow stress for the material were investigated. The results show that under the condition of high strain rate, the material has a certain strain rate strengthening and plasticizing effect. With the increase of temperature, the effects of the thermal softening by adiabatic heating increase, and the length of shear zone increases. The material in 750 °C shows abnormal strain rate softening, and the shear band bifurcation may be the cause of strength decreasing.
引文
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[4]Wang Xuebin(王学滨).Rare Metal Materials&Engineering(稀有金属材料与工程)[J],2006,35(12):1854
[5]Xu Yuan(徐媛),Sun Kun(孙坤),Zhong Wei(钟卫)et al.Journal of Yunnan University:Natural Sciences(云南大学学报,自然科学版)[J],2012,34(3):320
[6]Yang J,Li H,Hu D et al.Intermetallics[J],2014,45:89
[7]Xiong Aiming(熊爱明),Huang Weichao(黄维超),Chen Shenghui(陈胜晖)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2002,12(S1):206
[8]Wang Lili(王礼立),Hu Shisheng(胡时胜).Explosion and Shock Waves(爆炸与冲击)[J],1985,5(1):9
[9]Yang Yang(杨扬),Cheng Xinlin(程信林),Li Zhenghua(李正华)et al.Rare Metal Materials&Engineerring(稀有金属材料与工程)[J],2003,32(4):261
[10]Li G A,Zhen L,Lin C et al.Materials Science&Engineering A[J],2005,395(1-2):98
[11]Yang Y,Wang B F.Materials Letters[J],2006,60(17-18):2198
[12]Guan Jie(官杰),Liu Jianrong(刘建荣),Lei Jiafeng(雷家峰)et al.Chinese Journal of Materials Research(材料研究学报)[J],2009,23(1):77
[13]Martinez F,Murr L E,Ramirez A et al.Materials Science&Engineering A[J],2007,454-455:581
[14]Zhang Changqing(张长清),Xie Lansheng(谢兰生),Chen Minghe(陈明和)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2015,25(2):323
[15]Shen Guiqin(沈桂琴),Zhang Hong(张虹),Wang Shihong(王世洪)et al.Journal of Aeronautical Materials(航空材料学报)[J],1997,17(2):26
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