摘要
用金相显微镜和扫描电镜对镍基定向高温合金铸态及热处理态的组织进行观察和分析，用透射电镜的EDS对合金元素在Υ和Υ’两相中的分配比进行测试和分析，研究了在AI＋Ti质量总和相同条件下，Ti／A1比对其微观组织及持久性能的影响。结果表明：随着Ti／A1比的增加，合金铸态组织中共晶含量显著增加，共晶周围有卵相生成；合金初熔温度降低；相同热处理条件下，Υ’相的尺寸增加，立方度降低；合金持久性能变化不大。
The microstructure and creep property of a directionally solidified nickel base superalloy with different Ti/AI ratio was observed and the as-cast and heat treated microstructure was analyzed by OM and SEM. Partition ratio of alloy element in Υ＇ and Υ＇ phase was measured by TEM equipped with EDS. The influences of Ti/AI ratio on the microstructure and the creep property were investigated. The results show that the amount of eutectics in the as-cast samples increased obviously and r/phase formed around the eutectic with the increasing of Ti/AI ratio; meantime, the incipient melting temperature decreased and the size of Υ＇ phase in the heated samples increased and the morphology turned irregular. No obvious effect of Ti/AI ratio was found on the creep properties of the present experiment alloy.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2012年第4期361-366,共6页
Chinese Journal of Materials Research
基金
国家重点基础研究发展计划2010CB631201
国家自然科学基金51171193资助项目~~
关键词
金属材料
镍基定向高温合金
Ti/Al比
微观组织
持久性能
metallic materials, directionally solidified Ni-base superalloy, Ti/AI ratio, microstructure,creep property
