第二相对Ti-25V-15Cr-2Al-0.2C-x(x=0,2%Mo,2%Nb,02%Si)合金拉伸断裂行为的影响  

Effects of Second Phases on Tensile Fracture Behavior of Ti-25V-15Cr-2Al-0.2C-x(x=0, 2%Mo, 2%Nb, 0.2%Si) Alloys

作　　者：雷力明[1] 黄旭[1] 吴学仁[1] 曹春晓[1] Rugg D Voice W 

机构地区：[1]北京航空材料研究院,北京100095 [2]Rolls-Royce Plc

出　　处：《稀有金属》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 )

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.

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 

分 类 号：TG146.23[一般工业技术—材料科学与工程]