合金成分对TiAl合金热变形加工影响的研究进展

Effects of Alloying Additions on Hot Deformation Processing of TiAl Alloys

TiAl合金的热加工(锻造、热挤压、板材轧制等)窗口窄、高温变形能力差、室温脆性大等成为限制其应用的关键因素,本文主要综述了合金成分对TiAl合金热变形加工以及超塑性成形影响等方面的研究现状,从TiAl合金的晶体结构、β相含量、显微组织细化、热变形激活能4个方面探讨了合金成分对TiAl合金热变形加工的影响,并指出合金化方式提高TiAl合金热变形加工能力应该遵循的几点原则,以及TiAl合金热变形加工的未来发展趋势。

The disadvantages of TiAl alloys such as narrow hot-working window（forging, hot extrusion, rolling, etc）, poor high temperature deformability and brittleness at room temperature restrict their applications in actual projects. The research state of effects of alloying additions on hot deformation processing and superplasticity of TiAl based alloys was reviewed. The effects of alloying additions on hot deformation processing of TiAl alloys were discussed from the aspects of the crystal structure of TiAl alloys, the fraction of β phase, microstructures and activation energy. The principles that the alloying method should follow to improve hot deformability of TiAl based alloys and the developing trend of hot deformation processing of TiAl alloys were finally proposed.