丁方政,陈昊,许剑伟,杨功,谭俊龙,纪建敏,周章瑞

• 1:空装驻北京地区第六军事代表室
• 2:北京航空材料研究院先进高温结构材料重点实验室
• 3:沈阳工业大学材料科学与工程学院

摘要(Abstract)：

利用扫描电镜和透射电镜及拉伸试验机等研究了一种自行设计的低Re第二代镍基单晶高温合金在不同温度下的拉伸变形行为及微观机制。结果表明：合金的屈服强度和抗拉强度随试验温度的升高先增加后降低，并表现出明显的反常屈服现象，760℃时合金的屈服强度达到峰值1099 MPa;断口分析表明在室温和760℃下合金的断裂模式为纯剪切断裂，而在980℃下转变为微孔聚集型断裂；合金在室温下的主要变形机制为单根超位错和小宽度层错剪切γ′相，在760℃下的变形机制为大宽度层错剪切γ′相，而在980℃下变形机制转变为带有反相畴界(APB)的超位错对剪切γ′相。

关键词(KeyWords)： 镍基单晶高温合金;拉伸性能;断口形貌;位错组态;拉伸变形机制

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 丁方政,陈昊,许剑伟,杨功,谭俊龙,纪建敏,周章瑞

DOI: 10.13289/j.issn.1009-6264.2022-0115

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