TC11钛合金相变点的测定与分析  

Measurement and Analysis of Phase Transformation Temperature of TC1l Titanium Alloy

作　　者：李玉涛[1] 耿林[1] 徐斌[1] 李爱滨[1] 王桂松[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《稀有金属》2006年第2期231-235,共5页Chinese Journal of Rare Metals

基　　金：国家重大基础研究"973"项目资助(51319)

摘　　要：采用计算法、差示扫描量热法和连续升温金相法3种手段计算和测定了TC1l两相钛合金(α+β)/β相变点。计算法由于各元素及杂质元素含量对相变点的影响值是在一个含量范围内的计算值,因此计算的相变点与实测值是接近的;差示扫描量热法由于钛合金和坩埚的化学反应,产生相变滞后现象,导致所测相变温度过高;而连续升温金相法由于淬火温度间隔选择较小,测量的准确性较高,因此更能准确测量TC11钛合金相变温度。通过连续升温金相法,观察不同淬火温度的试样在光学显微镜下的显微组织变化,发现升温过程中初生α相完全消失的温度,从而确定了TC11钛合金的相变点为1035℃。并分析了不同钛合金之间相变点差异的原因。Three methods including the calculation method, differential scanning calorimetry and metallographic techniques were employed to calculate and measure the phase transformation temperature of TC 11 titanium alloy. The comparison between the three methods indicates that the theory value obtained by the calculation method approaches the true value, because this method requires that the content of each element in the TC 11 alloy is in a certain range. The value obtained by the differential scanning calorimetry method is a little exorbitant, because continuous heating delays the phase transformation. The phase transformation temperature can be measured accurately by the metallographic technique if more quenching temperatures are chosen. In the metallographic method, the microstructure of the samples quenched from different temperatures was observed and the temperature at which the primary phase disappear was determined, so that the α＋β/β transformation temperature of the TC 11 titanium alloy is determined to be 1035 ℃. The reason of the difference of phase transformation temperature between different titanium alloys was discussed.

关 键 词：TC11钛合金 相变点 连续升温金相法 

分 类 号：TG146.1[一般工业技术—材料科学与工程]