Abstract: In this work, a heat treatment in single β region was utilized to remove the peritectic α phase (αp) in a high Nb containing TiAl alloy and the relationships among treatment temperature, annealing time and peritectic α phase were analyzed from the aspect of thermodynamics and dynamics. The results showed that the as-cast high Nb containing TiAl alloys exhibited a significant solidification segregation, resulting in the formation of peritectic α phase, and the αp phase was eliminated by a heat treatment in single β region, i.e., 1 520 ℃ for 20 min. These phenomena were attributed to the instability of peritectic α phase and interdiffusion of Al and Nb elements in local regions. The thermodynamic instability led to the occurrence of αp→β transformation. The Al concentration in interdendritic regions decreased exponentially with annealing time. After the heat treatment at 1 520 ℃ for 20 min, the peritectic α phase was completely removed.The alloy undergoes a phase transition in the β solidification path, and a uniform and fine near-lamellar structure is obtained.
作者简介: 王义飞,2018年6月毕业于陕西科技大学,获得学士学位。现就读于陕西科技大学,机电工程学院研究生,主要从事TiAl合金相变行为研究。杨光,男,工学博士,副教授,硕士生导师。 2009年于四川大学金属材料工程获得学士学位, 2016年11月毕业于西北工业大学材料加工工程专业并获得工学博士学位。2016年在陕西科技大学机电工程学院材料加工工程系进行教学科研工作。主持和参与国家级和省部级等项目9项,其中主持国家自然科学基金青年项目1项和陕西省自然科学基础研究计划1项,陕西科技大学 “引进博士科研启动基金” 项目1项,参与国家自然科学基金、“973”子课题、航空基金等项目6项。在国际材料类期刊Acta Materialia, Journal of Alloys and Compounds,Intermetallics等高水平期刊发表论文30余篇。申请国家发明专利7项,已授权3项。研究领域主要包括轻金属的显微组织演化及控制、金属材料的变形行为及组织表征等。
引用本文:
王义飞, 高东强, 田普建, 任威, 刘延辉, 宋文杰, 杨艳玲, 杨光. 高铌TiAl合金中包晶α相消除的热力学及动力学分析[J]. 材料导报, 2019, 33(12): 2014-2018.
WANG Yifei, GAO Dongqiang, TIAN Pujian, REN Wei, LIU Yanhui, SONG Wenjie, YANG Yanling,YANG Guang. Thermodynamics and Dynamics Analysis on the Elimination of the Peritecticα Phase in a High Nb Containing TiAl Alloy. Materials Reports, 2019, 33(12): 2014-2018.
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2019, Vol. 33 
