测量了Ti-1100和Ti-1100/0.1%Y(质量分数)高温钛合金在600°C/100 h空气中暴露后的拉伸性能及在600°C/150MPa/100 h条件下的蠕变性能,利用透射电镜观察了合金室温及蠕变后的组织.结果表明, Ti-1100合金加入0.1%的Y后,由于原始β晶粒得到细化,明显改善了其热稳定性;固溶在基体中的硅原子阻碍位错滑移和攀移,使蠕变中的回复过程难于实现;稀土还抑制α2相的长大,所形成的氧化物也阻碍位错的运动.这些均有利于提高Ti-1100合金的抗蠕变性能.
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