材料工程2025，Vol.53Issue(10)：71-79,9.DOI:10.11868/j.issn.1001-4381.2023.000551
第三代镍基单晶高温合金760℃蠕变行为及其微观变形机制
Creep behavior and microscopic deformation mechanism of third-generation Ni-based single crystal superalloy at 760℃
许瑞达 1李影 1于慧臣1
作者信息
- 1. 中国航发北京航空材料研究院 先进高温结构材料重点实验室,北京 100095||航空材料检测与评价北京市重点实验室,北京 100095||中国航空发动机集团材料检测与评价重点实验室,北京 100095
- 折叠
摘要
Abstract
The creep deformation mechanism of the superalloy at 760℃is investigated by analyzing the creep deformation behavior of a third-generation nickel-based single crystal superalloy at 760℃and characterizing its microstructural evolution and dislocation configurations.The results show that the primary creep deformation mechanism at 760℃is the shearing of dislocations into the γ' phase.In the initial creep stage,the predominant form of dislocation dissociation within the γ' phase involves Shockley partial dislocations coupled with stacking faults.Stacking faults on different{111}planes can interact with each other,forming Lomer-Cottrell(L-C)dislocation locks.During the later creep stage,a large number of a<011>superdislocations shear into the γ' phase,and these superdislocations can cross-slip from{111}planes onto{001}planes,forming Kear-Wilsdorf(K-W)locks with non-planar structures.Throughout the creep process,the formation of both L-C locks and K-W locks impedes dislocation motion,thereby enhancing the creep resistance of the superalloy.关键词
镍基单晶高温合金/蠕变/变形机制/位错组态Key words
Ni-based single crystal superalloy/creep/deformation mechanism/dislocation configuration分类
通用工业技术引用本文复制引用
许瑞达,李影,于慧臣..第三代镍基单晶高温合金760℃蠕变行为及其微观变形机制[J].材料工程,2025,53(10):71-79,9.
