摘要
研究了第二相对Ti 2 5V 15Cr 2Al 0 .2C x (x=0 ,2 %Mo,2 %Nb ,0 .2 %Si)阻燃β钛合金拉伸断裂行为的影响。结果表明 ,β晶界上析出的α相增加了合金发生沿晶断裂的趋势 ,特别是热暴露后形成的连续晶界α膜是导致合金脆性沿晶断裂的主要原因。虽然粗大的碳化物颗粒是合金中的裂纹源之一 ,但细小、弥散分布的碳化物却能显著降低合金发生脆性沿晶断裂的趋势 。
The effects of the second phases on the tensile fracture behavior of Ti 25V 15Cr 2Al 0.2C x(x =0, 2%Mo, 2%Nb, 0.2%Si) burn resistant β titanium alloys were investigated. The results show that α precipitation on β grain boundaries promotes the trend of intergranular failure in the alloys. Especially, a continuous grain boundary α film formed after thermal exposure mainly results in the occurrence of brittle intergranular failure, thus greatly exacerbating the ductility of the alloys. Although coarse carbides were found to be possible crack initiation sites, carbides with small size and uniform distribution can significantly decrease the tendency of brittle intergranular failure in the alloys due to refining the microstructure and suppressing the formation of α precipitation on β grain boundaries.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2004年第1期47-49,共3页
Chinese Journal of Rare Metals
基金
英国Rolls Royce公司资助项目 ( 2 0 0 0~ 2 0 0 2 )
关键词
金属材料
阻燃钛合金
微观组织
第二相
拉伸断裂行为
burn resistant titanium alloy
microstructure
second phase
tensile fracture behavior
