(中南工業(yè)大學(xué)粉末冶金研究所，長(zhǎng)沙410083)
摘 要: 通過(guò)復(fù)合熱機(jī)械處理新工藝，得到了細(xì)小均勻的TiAl基合金的顯微組織，并研究了這些顯微組織的斷裂韌性。結(jié)果表明：全層片組織的斷裂韌性最高，近層片組織的稍次，雙態(tài)組織的最低。最后分析了TiAl基合金的顯微組織被均勻細(xì)化的原因，并討論了各種顯微組織的斷裂機(jī)制。
關(guān)鍵字: TiAl基合金 顯微組織 斷裂韌性 復(fù)合熱機(jī)械處理
TOUGHNESS OF TiAl-BASED ALLOY
（Powder Metallurgy Research Institute,
Central South University of Technology, Changsha 410083）
Abstract:The microstructures of TiAl-based alloy were refined and homogenized by multi-step thermomechanical treatment (MSTMT) process, and the fracture toughness of the materials with these fine microstructures were investigated. The results showed that the lamellar microstructure yielded higher fracture toughness than the duplex microstructure did. The refining mechanism of the microstructures was analysed and the fracture mechanisms were discussed.
Key words: TiAl-based alloy microstructures fracture toughness
