万志鹏,王涛,李钊,韦康,张勇,孙宇,胡连喜

• 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
• 2:哈尔滨工业大学金属精密热加工国家级重点实验室

摘要(Abstract)：

对锻态GH4720Li合金进行了不同温度与时间的等温热处理,定量分析了其晶粒尺寸、强化相体积分数与尺寸,研究了1050～1160℃加热时锻态GH4720Li合金晶界一次γ′相的溶解与晶粒长大规律,分析了晶界一次γ′相对合金晶粒长大行为的影响。结果表明:当晶界一次γ′相的尺寸小于3.5μm时,其对晶界的钉扎作用减弱,合金的晶粒尺寸发生明显的长大。而当加热温度高于1150℃时,由于强化相的大量溶解,晶粒发生异常长大。从动力学角度分析了晶界处不同尺寸一次γ′相的合金的晶粒长大规律,随后采用Arrhenius型方程建立了表征GH4720Li合金晶粒长大行为的动力学模型,并对模型的预测精度进行了评价。

关键词(KeyWords)： GH4720Li合金;晶粒长大;一次γ′相;激活能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 万志鹏,王涛,李钊,韦康,张勇,孙宇,胡连喜

DOI: 10.13289/j.issn.1009-6264.2020-0069

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