Ti-47Al-2W-0.5Si抗蠕变合金的高温力学行为和变形机制

金属学报, 2001, 37(8): 785-790. doi: 10.3321/j.issn:0412-1961.2001.08.001

Ti-47Al-2W-0.5Si抗蠕变合金的高温力学行为和变形机制

周兰章 ^1, , 郭建亭 ^2, , V.Lupinc ^3, , M.Maldini ^4,

1.中国科学院金属研究所,沈阳,110016;CNR-TEMPE,Via R.Cozzi 53,20125 Milano,Italy

2.中国科学院金属研究所,沈阳,110016

3.CNR-TEMPE,Via R.Cozzi 53,20125 Milano,Italy

4.CNR-TEMPE,Via R.Cozzi 53,20125 Milano,Italy

关键词：金属间化合物 , TiAl , 力学性能 , 蠕变

HIGH-TEMPERATURE MECHANICAL BEHAVIOR ANND DEFORMATION MECHANISM OF Ti-47Al-2W-0.5Si CREEP-RESISTANT ALLOY

研究了Ti-47Al-2W-0.5Si铸造合金的力学行为和变形机制.结果表明,合金的室温-高温屈服强度和650℃蠕变强度都超过IN713LC镍基高温合金的比屈服强度和比蠕变强度,表现出优异的中温力学性能.在蠕变过程中,随着载荷和温度的增加,合金的最小蠕变速率随之增大,可用蠕变方程εm=A(σ/E)10exp(-420/RT)来描述.位错在界面处繁殖,并在α2/γ层片中缠结和塞积,导致合金的初始蠕变应变速率降低.当位错运动受阻时,可以通过孪生方式使内应力得到缓解,在蠕变第一阶段就可以发生孪生和剪切现象.在高温应力作用下,α2片层发生粗化和相转变.此外,还对合金的实际应用效果进行了考核,并说明了该合金的发展方向.

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