镍基单晶高温合金短时时效过程中取向变化的原位研究

镍基单晶高温合金短时时效过程中取向变化的原位研究

李 晴¹，龙海波¹，向思思¹，王晓冬^1，2，韦 华³，张洪宇³，毛圣成^1*, 张 泽^1，4，韩晓东^1*

(1.北京工业大学固体微结构与性能研究所 北京市重点实验室，北京100124；2.中国人民武装警察部队学院基础部，河北 廊坊065000；3.中国科学院金属研究所 金属腐蚀与防护国家重点实验室，辽宁 沈阳110016；4.浙江大学材料科学与工程学院，浙江 杭州310027）

摘要  利用TEM和XRD原位研究了一种镍基单晶高温合金在时效过程中的取向变化。研究发现固溶-时效热处理后的初始样品内部不同γ′相之间存在~4º的小角度晶界。对材料在950 ℃下进行10min短时时效处理，原位TEM和XRD结果表明γ′相的取向偏离初始取向~5º，且该取向变化在降温之后也不会完全恢复；该短时升、降温过程使γ′相的取向集中度增加。

关键词  镍基单晶高温合金；取向变化；原位TEM；原位XRD

中图分类号：TG132.3⁺2；TG115.21⁺5.3；O657.62  文献标识码：A        doi:10.3969/j.issn.1000-6281.2016.02.001

In situ study of the orientation evlution of a Ni-base single crystal superalloy during short-time aging treatment

LI Qing¹，LONG Hai-bo¹，XIANG Si-si¹，WANG Xiao-dong^1，2，WEI Hua³，ZHANG Hong-yu³，MAO Sheng-cheng^1*，ZHANG Ze^1，4，HAN Xiao-dong¹

(1. Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124；2. Fundament Department, Chinese People's Armed Police Force, Langfang Hebei 065000；3. Superalloys Division, Institute of Metal Research, CAS, Shenyang Liaoning 110016；4. State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou Zhejiang 310027，China)

Abstract  The orientation evolution in a Ni-base single crystal superalloy subjected to short-time aging treatment was studied by in-situ TEM and XRD. The γ′ precipitates are revealed to have ~ 4ºlow-angle misorientation among sample after solid solution and aging treatment. For sample aged at 950 ℃for 10 min, in situ TEM and XRD analyses show that the orientation of the γ′ phase deviates from its original orientation for ~5º. The orientation deviation can not be fully recovered after cooling down to room temperature. After this heating-cooling cycle, the sample shows a more intensive orientation concentration.

Keywords  Ni-based single crystal superalloys；orientation evolution；in situ TEM；in situ XRD

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