放电等离子体烧结制备钨-钒-铬合金及性能表征

Fabrication and Characterization of Tungsten-Vanadium-Chromium Alloy by Spark Plasma Sintering

利用机械球磨、放电等离子体烧结法制备了质量分数（％，下同）为W-（10~30）V-（10~30）Cr的三元合金，对烧结后的合金进行了显微结构和室温力学性能研究。结果表明，采用放电等离子体烧结可以制得相对密度为99．7％的W．30V-20Cr合金，其实际密度比烧结纯钨降低了49．74％；显微结构分析表明V、Cr可以很好地合金化，形成塑性连续相，包裹在钨分散相的周围，很好地改善了钨合金的力学性能，W-30V-20Cr的抗弯强度为437．13MPa，比烧结纯钨增加了25％，HV硬度为6154MPa；W-30V-20Cr合金具有较高的断裂韧性值，为15．51MPa·m1/2。

W-（10~30）V-（10~30）Cr ternary alloys were fabricated by ball milling and subsequent spark plasma sintering（SPS）, their microstructures and mechanical properties at ambient temperature were investigated. The results show that the nearly full dense billet of W-30V-20Cr alloy can be prepared by SPS, its relative density is 99.7%, its actual density is 49.74% lower than that of pure tungsten. The microscopic analysis shows that V and Cr can be alloyed excellently and the plastic continuous phase is formed, which continuously surrounds the tungsten dispersed phase and improves the mechanical properties of tungsten alloys. The W-30V-20Cr alloy has a bending strength of 437.13 MPa which increases by 25% compared to that of the sintered pure tungsten. The W-30V-20Cr alloy has a HV hardness of 6154 MPa, a high fracture toughness of 15.51 MPa.m1/2.