【摘要】 变形TiAl合金以其低密度、高强度和优异抗氧化性等优点,成为最有潜力替代航空航天动力系统中较重镍基合金的高温结构材料。经过多年的研究,变形TiAl合金的发展已经取得了很大进步。本工作主要综述了近年来变形TiAl合金在合金化、熔炼、热加工(锻造、挤压和轧制)、粉末冶金和后续热处理等方面的研究进展。探讨变形TiAl合金存在的问题,并认为进一步提高合金的热加工性和室温塑性,开展合金化、热加工工艺优化、数值模拟等方面的研究,实现TiAl合金的工程化应用是未来TiAl合金领域的发展方向。更多还原

【Abstract】 Deformed TiAl alloys,the most promising high temperature structure materials due to their low density,high strength and good oxidation resistance,can be used to replace heavier Ni-based alloys applied in power system of aerospace industries. Great improvement was made after years of research. Progresses in alloying,smelting,hot deformation( forging,hot extrusion and rolling),powder metallurgy and heat treatment of TiAl alloys were reviewed. The problems existed in researches were also discussed. Finally,the prospective future development of deformed TiAl alloys was summarized. The hot workability and room temperature ductility of TiAl alloy need to be further improved. Alloying,hot deformation and numerical simulation are future research directions. The ultimate goal is engineering applications.更多还原