稀土影响高温合金GH907性能的显微机理研究  

Micro-mechanism Study on the Properties Affects in a Low Expansion Superalloy GH907 with Addition of RE Elements

作　　者：王荣明[1] 李春志[1] 颜鸣皋[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《材料工程》2001年第7期25-28,共4页Journal of Materials Engineering

基　　金：航空科学基金资助项目 (编号 :96G2 1 0 0 3)

摘　　要：研究了稀土对 GH90 7合金的力学和物理性能的影响规律 ,优选了可改善 GH90 7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 GH90 7合金和含稀土 GH90 7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 。WT5BZ]The affective rule of the mechanical and physical properties in Fe Ni Co Nb Ti Si low expansion superalloys with addition of RE elements has been studied The alloy system with good notch bar rupture strength and oxidation resistance at high temperatures has been selected and investigated The micro mechanism of the properties improvement has also been proposed by comparison of the microstructures and interface structures of the alloys with and without yttrium addition The results reveal that the rare earth element exists in the platelet phase and changes the content, morphology, distribution and crystal structure of the phase The crystal misfit and stress at the interface between the platelet phase and the matrix decrease significantly

关 键 词：低膨胀高温合金 稀土 显微组织 界面 GH907合金 微观机理 力学性能 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG113.2[金属学及工艺—金属学]