MA-SPS-HIP技术制备钒合金的工艺探索

MA-SPS-HIP Technique for Vanadium Alloys Preparation

探索了机械合金化．放电等离子体烧结．热等静压（MA—SPS—HIP）技术制备V-4Cr-4Ti-1．8YH2合金的工艺流程，并对其在1000～1200℃下真空退火后的性能进行了测试。XRD和SEM分析表明，球磨50h以上基本上可以达到机械合金化的目的。材料的拉伸测试表明V-4Cr-4Ti-1．8YH2合金有良好的力学性能，并且在退火温度为1100℃真空退火后综合力学性能达到最佳。合金材料微观组织分析表明，V合金的晶粒尺寸大多在0．5um以下，YH2在烧结过程中转变成了Y2O3，以小于50nm的粒子弥散分布在基相之中。

This paper discussed the technical process of mechanical alloying-spark plasma sintering-hot isostatic pressing （MA-SPS-HIP） to fabricate vanadium alloy V-4Cr-4Ti-1 .SYH2, and the properties of the alloy after annealing treatment at 1000-1200 ℃ were tested. The XRD and SEM analyses show that it can reach the purpose of mechanical alloying after 50 h milling. The tensile test shows that V-4Cr-4Ti-1.8YH2 alloy has a better mechanical property which can reach the optimum when the annealing temperature is 1100℃. Microstructure analysis shows that the grain size of the vanadium alloy is mostly below 0.5μm, and YH2 transforms into Y2O3 during sintering process which are less than 50 nm particles distributing in the matrix.