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金属学报  2001 

镍基高温合金U720Li的组织稳定性及蠕变行为

, PP. 1159-1164

Keywords: 镍基高温合金,热稳定性,蠕变

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Abstract:

研究了新型镍基高温合金U720Li在650和700℃时组织稳定性、蠕变行为和变形机制.结果表明,在长期时效过程中,初生γ'相、二次γ'相以及晶界析出相的形态几乎不发生变化,三次γ'相经历一个粗化长大和溶解消失的过程.在650℃蠕变过程中,蠕变第一阶段的形变量随着施加应力的增加单调增大,而在700℃蠕变时,蠕变第一阶段的形变量随着施加应力的增加先降后升.合金650和700℃蠕变断裂寿命和最小蠕变速率在低应力区和高应力区服从于不同斜率的双对数线性规律在高温低应力下,合金的蠕变机制为位错攀移机制,而在低温高应力下,蠕变过程由位错切割机制控制.

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