高温与高应变率对TC21钛合金动态压缩性能及其绝热剪切敏感性的影响  

Effects of high temperature and high strain rate on dynamic compression performance and adiabatic shear sensitivity of TC21 titanium alloy

作　　者：张俊喜 易湘斌 沈建成 李宝栋 唐林虎 徐创文 ZHANG Junxi;YI Xiangbin;SHEN Jiancheng;LI Baodong;TANG Linhu;XU Chuangwen(School of Material Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;Gansu Provincial Key Lab of Green Cutting Technology and Application,Lanzhou 730050,China)

机构地区：[1]兰州工业学院材料工程学院,兰州730050 [2]绿色切削加工技术及应用甘肃省重点实验室,兰州730050

出　　处：《振动与冲击》2020年第19期135-140,155,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51865026);甘肃省高等学校科研项目创新团队项目(2018C-23);甘肃省自然基金(18JR3RA229);兰州工业学院青年科技基金(18K014,17K002)。

摘　　要：利用分离式霍普金森压杆技术,研究了高温及高应变率对网篮组织TC21钛合金动态压缩性能和绝热剪切敏感性的影响。结果表明:在相同温度(25~350℃)下,材料具有一定的应变率增强、增塑效应,但450℃表现出应变率软化现象;在相同应变率下,动态抗压强度随着环境温度升高而降低;当应变率为2000 s^-1、3000 s^-1时,试样均发生剪切失效,且随环境温度升高,试样的绝热剪切敏感性提高,剪切带宽度增加。Effects of high temperature and high strain rate on dynamic compression performance and adiabatic shear sensitivity of TC21 titanium alloy with basket-weave microstructure were studied using the split Hopkinson pressure bar(SHPB).Results showed that under the same temperature(25-350℃),the material has a certain strain rate strengthening and plasticizing effect;under 450℃,it has strain rate softening phenomenon;under the same strain rate,its dynamic compressive strength decreases with increase in temperature;when the strain rate is 2000 s^-1 and 3000 s^-1,all specimens have shear failure;with increase in temperature,specimens’adiabatic sensitivity grows and their shear band width increases.

关 键 词：TC21钛合金 动态压缩性能 绝热剪切敏感性 绝热剪切带 

分 类 号：TG146[一般工业技术—材料科学与工程]