全片层高Nb含量TiAl合金长期热循环后的显微组织不稳定性(英文)

被引:9
作者
方璐 [1 ]
丁贤飞 [2 ]
何建平 [1 ]
张来启 [1 ]
林志 [1 ]
林均品 [1 ]
机构
[1] 北京科技大学 新金属材料国家重点实验室
[2] 北京科技大学 国家材料服役安全科学中心
关键词
TiAl合金; 热循环; 热稳定性; 不连续粗化;
D O I
暂无
中图分类号
TG146.23 [];
学科分类号
080502 ;
摘要
对全片层Ti-45Al-8.5Nb-(W,B,Y)合金在900℃下进行长期热循环(500次和1000次)实验,采用扫描电镜(SEM)及透射电镜(TEM)研究该合金长期热循环后的显微组织不稳定性。结果表明:合金经热循环后主要产生两种类型的组织不稳定性:1)长期热循环特别是1000次热循环后,在Al偏析处易产生因晶界迁移引起的不连续粗化,随着循环次数的增加,元素扩散致使Al偏析逐渐减少;2)1000次热循环后,α2片层变细且发生断裂,这是由α2→γ相变导致的α2片层溶解所致。同时,γ晶粒在α2片层或(α2+γ)片层内部以任意方向形核。
引用
收藏
页码:3095 / 3102
页数:8
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