粉末冶金工艺制备Ir-Zr-W合金及其显微结构研究

Preparation and Microstructure of Ir-Zr-W Alloys by Powder Metallurgy Route

摘要:

采用粉末冶金工艺制备Ir-4Zr-0.3W (at%)合金，并对合金粉末和合金的相组成和显微结构分别进行了研究。发现，即使对合金粉末高能球磨24 h，也无法生成Ir3Zr相，不发生机械合金化现象。但是，当合金粉末经1300 oC煅烧后，完全转变为Ir3Zr相。采用粉末冶金工艺制备的铱合金晶粒尺寸细小，约4~5 μm，并且在铱合金中原位生成Ir3Zr相颗粒

Abstract:

Iridium alloys doped with approximate 4 at% Zr and 0.3 at% W alloying elements were fabricated for ultra-high temperature applications by powder metallurgy route. The phase compositions and microstructures of the composite powders and the alloy were investigated. It was found that Ir3Zr phase could not form and no mechanical alloying phenomenon occurred when the composite powder of Ir-ZrH2-W was prepared by high-energy ball milling even for 24 h, but it could be completely transmitted to Ir3Zr phase after calcinating at 1300 oC. The average grain size of the alloy prepared by the powder metallurgy route was 4-5 μm, and Ir3Zr phase was generated in-situ in Ir-based alloy during sintering process