TiAl预合金粉末表征及后续热压烧结组织特点  

Characterization of pre-alloyed TiAl powder and its microstructure characteristics after hot-pressing

作　　者：康福伟[1] 王珊珊 孙剑飞[2] 刘娜[3] 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 Instituteof Technology, Harbin 150001, China; 3. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, Chin)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [3]北京航空材料研究院先进高温结构材料重点实验室,北京100095

出　　处：《粉末冶金工业》2018年第1期38-44,共7页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(51434007);国家自然科学基金联合基金资助项目(U1435203)

摘　　要：采用激光粒度分析仪、金相显微镜、扫描电子显微镜（SEM）等手段,对气雾化工艺制备的TiAl基预合金粉末及其真空热压烧结组织进行研究。结果表明：采用气雾化工艺制备的预合金粉末颗粒细小,具有良好的球形度,粉末粒径主要分布在20.0~40.0μm之间,不同尺寸的粉末,其表面和内部组织形貌不同。小粒径粉末内部及表面均呈现无组织特征形貌,随着粉末颗粒尺寸的进一步增大,粉末表面及内部形貌均逐渐由胞状晶向树枝晶转变;经真空热压烧结后,其微观组织致密均匀,表面形貌平整无孔洞,内部形貌呈双态组织。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.

关 键 词：TIAL基合金 气雾化粉末 热压 显微组织 形貌 

分 类 号：TF125[冶金工程—粉末冶金]