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金属学报  2012 

新型镍基粉末冶金高温合金中γ'相扇形组织形成以及演化行为研究

DOI: 10.3724/SP.J.1037.2012.00226, PP. 830-836

Keywords: 镍基粉末冶金高温合金,扇形组织,冷却速率,时效处理

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Abstract:

对新型镍基粉末冶金高温合金FGH98I进行不同工艺热处理,采用场发射扫描电镜和透射电镜等研究了合金中扇形组织的形成和演变.结果表明,FGH98I合金中扇形组织是由手指形二次γ'相枝晶和其间的γ基体组成,其形成具有择域特性,高度过饱和晶界的成分偏聚区可作为非均匀形核核心,通过自身浓度梯度扩散控制其长大、发展.标准时效处理使扇形组织长大和粗化,高温时效处理使扇形γ'相发生形态失稳,逐渐变成低能状态的稳定立方形状γ'相.

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