研究了稀土对GH907合金的力学和物理性能的影响规律,优选了可改善GH907合金缺口持久性能、高温抗氧化性能的合金体系。通过比较标准GH907合金和含稀土GH907合金的显微组织和界面结构,提出了稀土提高合金性能的微观机理:稀土主要存在于合金的片状相中,使其含量、形态、分布和晶体结构发生改变,与基体之间界面晶格失配和界面应力大大减小。
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