摘要
在THERMECMASTER-Z型热模拟机上,对TC11钛合金在变形温度为780～1080℃、应变速率为10s-1和70s-1条件下的流动应力变化规律进行了研究,并分析了变形温度对组织的影响。结果表明,在高应变速率条件下,温度为990～1080℃时,变形呈稳态流动特征;温度为780～960℃时,变形呈流变软化特征。通过对不同温度下TC11钛合金的微观组织观察可知,在(α+β)两相区变形,当变形温度低于900℃、应变速率为10s-1和70s-1时,易发生绝热剪切或局部流动等塑性失稳现象。在β单相区变形,应变速率为10s-1和70s-1时,组织主要为拉长的β晶粒和少量的动态再结晶晶粒,以晶界变形为主,易造成β组织机械失稳。
Effects of temperature in range of 780 ℃ to 1 080 ℃ on the flow stress of the TC11 alloy have been tested by the Thermecmaster-Z thermo-analogue machine with strain rates of 10 s-1 and 70 s-1and on the microstructure have been observed.The results reveal that the steady flow characteristics can be observed during hot compressive deformation of TC11 alloy with the temperature in range of 990 ℃ to1 080 ℃,while the flow softening characteristics can be exhibited with the temperature in range of 780 ℃ to 960 ℃ at strain rates of 10 s-1 and 70 s-1.The microstructure observation shows that the TC11 alloy deformed in α+β phase zone exhibits adiabatic shearing or partial flow with temperature less than 900 ℃ at strain rates of 10 s-1 and 70 s-1.The microstructure of the alloy deformed in β phase zone consists of elongated β grain and minor dynamic recrystallization grain and show boundary deformation,which results in the mechanical instability of β phase.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第3期165-167,共3页
Special Casting & Nonferrous Alloys
基金
江西省材料科学与工程中心基金资助项目(ZX200601002)
作者简介
王克鲁，男，1968年出生，副教授，南昌航空大学材料科学与工程学院,南昌（330063），电话：133301111980,0791-3863039,E-mail：wangkdu@126．com
