Structure and morphology of Ti-Al composite powders treated by mechanical alloying

被引：15
|
作者：
Li Xue-wen [1 ]
Sun Hong-fei [1 ]
Fang Wen-bin [1 ]
Ding Yong-feng [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2011年 / 21卷
关键词：
TiAl; composite powder; mechanical milling; GAMMA-TITANIUM ALUMINIDES; SOLID-SOLUTIONS; MICROSTRUCTURE;
D O I：
10.1016/S1003-6326(11)61602-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The evolution in microstructure and composition of the milled Ti-Al composite powder with different milling time were investigated. It shows that with the milling time increasing, the initial powder underwent a successive change in its morphology from a flattened shape (2 h) to a fine, equiaxed and uniform one (above 6 h). The milled Ti-Al composite powder was nanocrystalline with the average crystallite size of about 17 nm after milling for 8 h. The evolution mechanism of Ti-Al composite powder was elucidated. The Ti(Al) solid solution is formed through a gradual and progressive solution of Al into Ti lattice. By differential thermal analysis on the ignition temperature of the reaction between Ti and Al as a function of milling time, it indicates that mechanical milling of the powders significantly lowered the ignition temperature of the reaction by refining its Ti-Al composite structure.
引用
收藏
页码：S338 / S341
页数：4
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