铬含量对Ti5Mo5V3Al-XCr系合金α+β/β转变温度的影响  

Effects of Cr Content on α+β/β Transition Temperature of Ti5Mo5V3Al-XCr Alloys

作　　者：崔雪飞[1] 米绪军[1] 林晨光[1] 陶海明[1] 惠松骁[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《稀有金属材料与工程》2014年第9期2118-2123,共6页Rare Metal Materials and Engineering

摘　　要：通过计算法、连续升温金相法及差示扫描量热法对Ti5Mo5V3Al-XCr(X=1.0,3.0,5.0,7.0,9.0,质量分数,%)系列合金的α+β/β相转变温度进行了测定。金相法测定结果显示,随着Cr含量的增加,相转变温度呈线性下降趋势,每提高1%的Cr含量,相变点降低17.5℃左右。通过观察各合金不同温度下的显微组织,发现随着Cr含量的增加,合金稳定β相能力逐渐提高,合金逐渐由近β钛合金向稳定型β钛合金过渡。结合差示扫描量热法测量结果显示,随着Cr含量的增加,合金相转变过程中的热效应逐渐减弱,相转变效应减弱。对比3种测定方法,尽管各有优缺点,但就β钛合金而言,金相法仍是最为直观、精确及可靠的方法。A calculation method, a metallographic method and differential scanning calorimetry （DSC） were used to determine the a＋fl/fl phase transition temperature of Ti5Mo5V3Al-XCr （X = 1.0, 3.0, 5.0, 7.0, 9.0, mass fraction） alloys. The results show that there is a linear downward trend of the transition temperature with the increase of Cr content according to the metallograpbic method. The transition temperature is decreased by 17.5 ℃ with the 1% increase of Cr content. The microstructures of alloys at the different temperatures show the ability to stable β phase is improved with the increase of Cr content, and the alloys are transformed from near β titanium to stable β titanium alloy gradually. With the increase of Cr content, the thermal effects of the transition are weakened. By .comparing the three methods, in terms of β titanium alloys, the metallographic method is still the most intuitive, precise and reliable way.

关 键 词：Ti5Mo5V3Al-XCr钛合金 α+β/β转变温度 金相法 

分 类 号：TG146.23[一般工业技术—材料科学与工程]