(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 為細(xì)化鎢晶粒，采用粉末冶金方法通過(guò)添加加量TiC于鎢基體中制備W-TiC合金，研究了微量TiC的添加對(duì)鎢性能與顯微組織的影響。結(jié)果表明：當(dāng)TiC的添加量為1%(質(zhì)量分?jǐn)?shù))，燒結(jié)溫度為1890 ℃時(shí)，W-TiC合金具有最佳性能，其拉伸強(qiáng)度可達(dá)401 MPa，致密度為97.4%；添加的TiC粉末以球狀二次相粒子形式分布于晶界和晶內(nèi)，與純鎢相比，TiC的添加有效地抑制了晶粒長(zhǎng)大，對(duì)鎢基體起到細(xì)晶強(qiáng)化與彌散強(qiáng)化作用。
關(guān)鍵字: W-TiC合金；二次相粒子；細(xì)晶強(qiáng)化；彌散強(qiáng)化；燒結(jié)行為
（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
