首页|两种高代次镍基单晶高温合金热机械疲劳中的再结晶行为

两种高代次镍基单晶高温合金热机械疲劳中的再结晶行为

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通过SEM和TEM等手段研究了经热机械疲劳变形后的第三代和第四代单晶高温合金的显微组织,了解高温合金在近服役条件下的变形组织,分析单晶高温合金近服役条件下的变形机制.结果表明,第三代和第四代单晶高温合金样品中在不同{111}面上产生了大量的变形孪晶,且在平行的孪晶片层中或者孪晶片层交截周围发现大量再结晶晶粒.再结晶晶粒的界面主要由变形后的孪晶界、小角度晶界以及孪晶相交产生的大角度晶界组成.借助像差校正透射电镜解析了变形后的孪晶界结构以及孪晶诱发动态再结晶的过程,揭示了单晶高温合金热机械疲劳断裂机制.
Recrystallization During Thermo-Mechanical Fatigue of Two High-Generation Ni-Based Single Crystal Superalloys
Ni-based single crystal superalloys are widely used for turbine engine blades because of their excellent high-temperature mechanical properties.Thermo-mechanical fatigue(TMF)is a complex deformation process that combines strain and temperature effects.This process is also considered as a deformation method related to the working conditions of aviation turbine blades.Therefore,understand-ing the deformation mechanism of materials undergoing TMF is important for extending the service life of aviation turbine blades.Here,third-generation and fourth-generation single crystal superalloys that experi-enced TMF deformation are investigated by SEM and TEM,including aberration-corrected STEM.The re-sults show the formation of deformation twins on different{111}planes of the single crystal superalloys.In addition,a large number of recrystallized grains are found in parallel twin lamellae or around the intersec-tion of twin lamellae.The grain boundary of recrystallized grains is primarily composed of twin boundaries,low-angle grain boundaries,and large-angle grain boundaries generated by twin intersections.Further-more,the twinning boundaries after deformation are analyzed using aberration-corrected TEM.Conse-quently,the process of twinning-induced dynamic recrystallization is comprehensively understood,which improved the TMF fracture mechanism of single crystal high-temperature alloys.These results improve the understanding of the deformation mechanism of single crystal superalloys under service conditions.

Ni-based single crystal superalloythermo-mechanical fatigue(TMF)aberration-corrected transmission electron microscopetwinrecrystallization

赵鹏、谢光、段慧超、张健、杜奎

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中国科学院金属研究所 沈阳材料国家研究中心 沈阳 110016

中国科学技术大学 材料科学与工程学院 沈阳 110016

中国科学院金属研究所 师昌绪先进材料创新中心 沈阳 110016

镍基单晶高温合金 热机械疲劳 像差校正透射电镜 孪晶 再结晶

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家科技重大专项项目

919602025217102051901229519115301549186020152271042P2022-C-IV-001-001

2023

10.11900/0412.1961.2023.00173

金属学报
中国金属学会

金属学报

CSTPCDCSCD北大核心
影响因子：0.925
ISSN：0412-1961
年,卷(期)：2023.59(9)
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