Characterization of pre-alloyed TiAl powder and its microstructure characteristics after hot-pressing
KANG Fu-wei1，WANG Shan-shan1，SUN Jian-fei2，LIU Na3
（1. School of Materials Science and Engineering， Harbin University of Science and Technology， Harbin 150040， China 2. School of Materials Science and Engineering， Harbin Institute of Technology， Harbin 150001， China 3. Science and Technology on Advanced High Temperature Structural Materials Laboratory， Beijing Institute of Aeronautical Materials， Beijing 100095， China）
Abstract：The TiAl-based pre-alloy powder prepared by gas atomization process and its vacuum hot pressing microstructure were studied by laser particle size analyzer， metallographic microscope and scanning electron microscope （SEM）. The results show that the pre-alloyed powder particles prepared by gas atomization process are fine and have good sphericity. The particle size is mainly distributed in the range of 20.0-40.0 μm. The powder particles with different size have different surface and internal morphology. The interior and surface of the small size powder show no histological features. With the further increase of the powder particle size， the surface and internal structure of the powder gradually change from the cellular dendrite to the dendrites. After vacuum hot-pressing， the dense and uniform microstructure is obtained and the internal microstructure is duplex.
康福伟，王珊珊，孙剑飞，刘 娜. TiAl预合金粉末表征及后续热压烧结组织特点[J]. , 2018, 28(01): 38-44.
KANG Fu-wei，WANG Shan-shan，SUN Jian-fei，LIU Na. Characterization of pre-alloyed TiAl powder and its microstructure characteristics after hot-pressing. , 2018, 28(01): 38-44.
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2018, Vol. 28 
