Ti_(2)AlNb基合金及其增材制造技术研究进展

Research Progress of Ti_(2)AlNb Based Alloy and Its Additive Manufacturing Technology

Ti_(2)AlNb基合金具有高比强度、低弹性模量和热膨胀系数、优异的抗蠕变性能和高温抗氧化性能,在航空航天领域具有非常广阔的应用前景,有望部分替代镍基高温合金用于制备航空发动机高温结构件,实现发动机的大幅度减重,显著提升发动机的推重比。Ti_(2)AlNb基合金加工性能差,利用传统成形工艺制备钛铝合金材料零部件面临低效率、高成本等一系列问题,严重制约其工程应用。近年来,增材制造技术因其高效率、低成本、净成形等优点,在制备钛铝合金方面极具优势和潜力,有望克服钛铝合金的加工难点并显著提升其力学性能。综述了Ti_(2)AlNb基合金的基本特性及其增材制造技术的研究进展,指出了增材制造Ti_(2)AlNb基合金现存的问题与不足,展望了增材制造Ti_(2)AlNb基合金的未来发展趋势和应用前景。

Ti_(2)AlNb based alloy has a combination of advantages,including high specific strength,low elastic modulus and coefficient of thermal expansion,excellent creep resistance and high temperature oxidation resistance,which has a very broad application prospect in the aerospace field and is expected to partially replace nickel based superalloy in the preparation of aeroengine high temperature structural parts,in order to greatly reduce the engine weight and significantly improve the thrust weight ratio of the engine.However,Ti_(2)AlNb based alloy has poor processing performance and the traditional forming processes for preparing Ti_(2)AlNb based alloy parts face a series of problems such as low efficiency and high cost,which significantly limits their engineering applications.In recent years,additive manufacturing technology has great advantages and potential in the preparation of titanium aluminum alloys owning to its high efficiency,low cost,net-shape forming and other merits,which is expected to overcome the processing difficulties and significantly improve the mechanical properties of Ti_(2)AlNb based alloy.In this paper,the basic characteristics of Ti_(2)AlNb based alloy and the research progress of parts fabricated by additive manufacturing technology are reviewed.The existing problems and shortcomings of Ti_(2)AlNb based alloy additive manufacturing are pointed out.Finally,the future development trend and application prospect of Ti_(2)AlNb based alloy additive manufacturing are prospected.