TiAl合金粉末热等静压技术研究进展

Research Progress of Powder Hot Isostatic Pressing for Intermetallic Titanium Aluminide

摘要:

TiAl合金具有高熔点、低密度、高比强度，良好的高温抗氧化、抗蠕变等性能，在航空航天及汽车发动机等领域应用前景广阔。粉末热等静压技术能够实现复杂形状TiAl合金零件的一体化成形，并且获得的零件晶粒尺寸细小、成分均匀、力学性能优异。本文介绍了TiAl合金雾化粉末制备原理与粉末热等静压致密化技术，评述了TiAl合金雾化粉末及经过热等静压和热处理后组织性能的研究进展，分析了TiAl合金粉末热等静压技术当前存在的一些问题，并对该技术的未来发展提出展望。

Abstract:

TiAl alloys have broad application prospects in aerospace and automobile engines, which is due to its excellent properties, such as high melting point, low density, high specific strength, good high temperature oxidation resistance, and creep resistance. Powder hot isostatic pressing can realize the integral forming of TiAl alloy parts with complex shapes, and the obtained parts have small grain size, uniform composition and excellent mechanical properties. In this paper, the principle of powder preparation by atomizing and powder hot isostatic pressing of TiAl alloys are introduced. The research states of microstructures and properties in TiAl alloys after atomization process, powder hot isostatic pressing and heat treatments are summarized. It also analyzes some problems of TiAl alloys’ powder hot isostatic pressing technology in the current, and puts forward prospects for the future development.