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

页码：S338 / S341

页数：4

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