Abstract The effects of Al content on microstructure, phase transformation and activation energy of Ti–12V-xAl (x = 2, 4 and 6 wt %) alloys produced by using the arc-melting technique have been investigated in the present study. These features of the alloys were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The XRD and SEM measurements showed that the alloys had simple of single orthorhombic α martensitic phase. In the DSC analysis, it was observed that the martensitic transformation temperature decreased depending on the heating rate in the alloys. The highest transformation temperature occured in the Ti–12V–4Al alloy. In TEM images, it was noteworthy that there were martensite structures arranged side by side in the structure of the alloys. The activation energies of the alloys were estimated using the Kissenger and Osawa method using the data obtained from DSC. Activation energies determined by these two methods were similar.

中文翻译：

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Al含量对Ti-V-Al高温形状记忆合金相变温度和活化能的影响

摘要 本研究研究了 Al 含量对采用电弧熔炼技术生产的 Ti-12V-xAl（x = 2、4 和 6 wt%）合金的微观结构、相变和活化能的影响。使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、差示扫描量热法 (DSC) 和透射电子显微镜 (TEM) 对合金的这些特征进行了表征。XRD 和 SEM 测量表明该合金具有简单的单一正交α马氏体相。在 DSC 分析中，观察到马氏体转变温度随合金中的加热速率而降低。最高转变温度出现在 Ti-12V-4Al 合金中。在 TEM 图像中，值得注意的是，在合金的组织中存在并排排列的马氏体组织。使用从 DSC 获得的数据，使用 Kissenger 和 Osawa 方法估计合金的活化能。这两种方法测定的活化能相似。