TiAl合金片层取向控制研究进展

TiAl合金因具有低密度、良好的高温强度以及抗氧化性,成为在航空航天及汽车行业具有重要应用价值的新型高温结构材料。对于全片层TiAl合金,通过控制α相沿非择优取向生长,获得平行于生长方向的片层组织,可显著提高其综合力学性能。TiAl合金的片层组织控制方法主要包括改变凝固路径法和籽晶法。综述了TiAl合金片层取向控制的现状及存在的主要问题,指出自引晶法和β相籽晶法是片层取向控制的新方法,将促进TiAl合金片层组织控制的工程化应用。最后,对TiAl合金片层取向控制的发展前景进行了展望。

Review of Lamellar Orientation Control of TiAl Alloys

TiAl based alloys are widely studied as a new generation of high temperature structural material for aerospace and automotive industries due to the low density,excellent high temperature strength and good oxidation re-sistance.For TiAl alloys with full-lamellar structures,the mechanical property can be improved by controlling the growth direction of primaryαphase and obtaining lamellar structures parallel to the growth direction.The main me-thods for the lamellar orientation control of TiAl alloy are adj usting solidification path and seeding technique.In this paper,the research status of this method is reviewed.It is worth noting that the self-seeding technology andβseeding technology are newly developed methods for the lamellar structure control of TiAl alloys which will promote the engi-neering applications of lamellar structure control technology for TiAl alloys.Finially,future research and development direction for the lamellar orientation control of TiAl alloys are pointed out.