(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 为细化钨晶粒，采用粉末冶金方法通过添加加量TiC于钨基体中制备W-TiC合金，研究了微量TiC的添加对钨性能与显微组织的影响。结果表明：当TiC的添加量为1%(质量分数)，烧结温度为1890 ℃时，W-TiC合金具有最佳性能，其拉伸强度可达401 MPa，致密度为97.4%；添加的TiC粉末以球状二次相粒子形式分布于晶界和晶内，与纯钨相比，TiC的添加有效地抑制了晶粒长大，对钨基体起到细晶强化与弥散强化作用。
关键字: W-TiC合金；二次相粒子；细晶强化；弥散强化；烧结行为
（State Key Laboratory of Power Metallurgy, Central South University, Changsha 410083, China）
Abstract:In order to refine the grain size of W, W-CTiC alloy was fabricated by powder metallurgy method through adding microscale TiC into W matrix. The effects of microscale TiC on performance and microstructure of W were investigated. The results show that W-1TiC (mass fraction, %) exhibits the best performance at the temperature of 1890 ℃, its relative density and tensile strength can reach to 97.4% and 401 MPa, respectively. The microscale TiC in the form of second phase particles disperses on the W transgranular and grain boundary uniformly. Comparing with pure W, the addition of microscale TiC can inhibit the grain growth, which plays the role of fine-grain strengthening and dispersed strengthening.
Key words: W-TiC alloy; second phase particle; fine-grain strengthening; dispersed strengthening; sintering behavior
