(重慶大學 材料科學與工程學院, 重慶 400044)
摘 要: 測出了厚度為2mm的Ti-Al-Zr單相α-Ti合金板材在350℃下的σb和σ0.2值。 據(jù)此結(jié)果， 確定了6個實驗應(yīng)力點。 在350℃下進行了高溫持久強度實驗， 用最小二乘法對實驗數(shù)據(jù)進行了處理， 得到該種鈦合金的lgσ—lgτ雙對數(shù)關(guān)系曲線。 對試樣的持久斷口進行SEM觀察后， 再用OM和TEM對該種鈦合金板材高溫持久實驗前的原始顯微組織和實驗后試樣的均勻塑性變形區(qū)與集中塑性變形區(qū)的顯微組織進行了觀察， 探討了Ti-Al-Zr合金在350℃和高應(yīng)力條件下的蠕變變形特征。
關(guān)鍵字: 鈦合金; 持久強度; 顯微組織; 蠕變
single phase α-titanium alloy
（College of Materials Science and Engineering,
Chongqing University, Chongqing 400044, China）
Abstract:The σb and σ0.2 at 350℃ of Ti-Al-Zr single phase α-Ti alloy plate with thickness of 2mm were got. High temperature lasting strength test was conducted at 350℃ according to the six experiment stresses determined by the results, and then the orginal microstructure, the microstructures in even plastic deformation zone and intensive plastic deformation zone were observed with optical microscope and transmission electron microscope(TEM). The creep mechanism of Ti-Al-Zr titanium alloy at 350℃ and high stress was discussed.
Key words: titanium alloy； lasting strength； microstructure； creep
