Thermodynamic study of the Al-Sc-Y system
Thermodynamic study of the Al-Sc-Y system
复制标题
Al-Sc-Y体系的热力学研究
DOI：
10.1016/j.tca.2018.01.018
复制
发表时间：
2018-03-10
影响因子：
3.5
通讯作者：
Jin, Z. P.
中科院分区：
文献类型：
--
作者：
Hu, J. L.;Bo, H.;Jin, Z. P.
用扫描电子显微镜/能量色散X射线能谱和X射线衍射法测定了Al-Sc-Y系合金在873 K时的相平衡。用差示扫描量热法测定了部分退火样品的相变温度。在建立三元体系的热力学描述之前，对Al-Y体系的相图进行了重新优化，与以前的评估相比，化合物的生成焓计算值有所提高。在实验结果的基础上，结合第一性原理计算和CALPHAD方法，对Al-Sc-Y三元系进行了热力学描述。利用所获得的热力学参数，计算了873 K等温截面、9at.% Sc和16 at.% Y和液相线投影，这些数据较好地解释了实验信息。
The phase equilibria of the Al-Sc-Y system at 873 K have been determined by scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray diffraction using individual alloys. Phase transition temperatures for some of the annealed samples have been measured by differential scanning calorimetry. Before establishing the thermodynamic description of the ternary system, the phase diagram of the Al-Y system was re-optimized, showing an improvement in the calculated enthalpy of formation of the compounds compared with previous assessments. Based on the experimental results of this work and the re-assessed Al-Y binary phase diagram, the thermodynamic description of the Al-Sc-Y ternary system was developed combining the first-principles calculation and the CALPHAD method. With the obtained thermodynamic parameters, the isothermal section at 873 K, the vertical sections at 9 at.% Sc and 16 at.% Y, and the liquidus projection are all calculated, which account for most of the experimental information satisfactorily.