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A Compact Process for the Preparation of Micro-fine Spherical High Nb Containing TiAl Alloy Powders
TONG Jianbo 1,LU Xin 2 * #,LIU Chengcheng 1,WANG Luning 1,QU Xuanhui 2
1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
*Correspondence author
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Funding: Aeronautical Science Foundation of China （No.2013ZE74004）, National Natural Science Foundation of China （No.51204015）
Opened online: 6 January 2015
Accepted by: none
Citation: TONG Jianbo,LU Xin,LIU Chengcheng.A Compact Process for the Preparation of Micro-fine Spherical High Nb Containing TiAl Alloy Powders[OL]. [ 6 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4626115
 
 
High Nb containing TiAl alloys are a new generation of materials for high temperature structural applications because of their superior high temperature mechanical properties. The alloy powders can be widely used in additive manufacturing, thermal spraying, and powder metallurgy field. Because of the difficulty of making micro-fine spherical alloy powders in quantity by the conventional techniques, a compact method of two-step ball milling from elemental powders and subsequent radio frequency（RF）argon plasma spheroidization was proposed. In comparison with the conventional mechanical alloying (MA) , the two-step milling process can be used to prepare uniform alloy powders with a short milling time period and no process control agent (PCA) added, which makes the process effective and less contaminating. After RF argon plasma spheroidization, the powders obtained exhibit good sphericity, and the number-average diameter is about 8.8μm with a symmetric unimodal particle size distribution. The powders show high composition homogeneity with phase dominated by supersaturated α2-Ti3Al. The oxygen and carbon contents of the alloyed powder are 0.47% and 0.050%, respectively.
Keywords:high Nb containing TiAl alloys; powder preparation; reaction mechanism; RF plasma spheroidization; ball milling
 
 
 

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