第三代镍基单晶高温合金原位加温-拉伸的研究

第三代镍基单晶高温合金原位加温-拉伸的研究

陈宇杰¹，党 理¹，张 泽^1，2*，李吉学^1*

(浙江大学 1.电子显微镜中心，2.硅材料国家重点实验室，浙江 杭州310027)

摘  要  本文通过环境扫描电子显微镜（ESEM）原位观察研究一种第三代镍基单晶高温合金以恒定速率在加温条件下的拉伸实验。在设定温度750℃下的实验结果表明：拉伸过程中由密排面{111}和密排方向<110>所组成的滑移系统最先启动，其它的滑移系统随着塑性变形的增加相继启动，并且该温度下拉伸样品在拉伸过程中产生位错运动，位错滑移以切过机制通过γ′强化相，从而合金出现中温硬化行为。

关键词  镍基单晶高温合金；加温-拉伸；表面形貌；断口形貌；韧性断裂

中图分类号：TG132.3⁺2；TG14；TG115.21⁺5.3   文献标识码：A    doi:10.3969/j.issn.1000-6281.2020.03.001

Research on in-situ heating and stretching of the third generation nickel-based single crystalline superalloy

CHEN Yu-jie¹，DANG Li¹，ZHANG Ze^1，2，LI Ji-xue^1*

(1. Center of Electron Microscopy, Zhejiang University，HangzhouZhejiang 310027；2. State Key Laboratory of Silicon Materials，HangzhouZhejiang 310027，China)

Abstract  In this paper, a third generation nickel-based single crystalline superalloy was researched by means of environmental scanning electron microscopy (ESEM). At the preset temperature of 750℃，the experimental results indicate that the sliding system which consists of close-packed plane of atoms of {111} and strong direction of < 110 > is started first in the tensile process. In addition, other sliding systems have been started with the increase of plastic deformation. Moreover, tensile samples produce dislocation movements in the process of stretching, and dislocation glide mechanism is cutting through the γ′ strengthening phase at that temperature, which contribute to the intermediate-temperature hardening behavior in the alloy.

Keywords  Ni-based single crystalline superalloy；heating-stretching; surface topography；fractography；ductile fracture 

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