THE EARLY STAGES OF PHASE-FORMATION DURING MECHANICAL ALLOYING OF TI-AL

被引：64
|
作者：
KLASSEN, T
OEHRING, M
BORMANN, R
机构：
[1] Institute for Materials Research, GKSS-Research Center
来源：
JOURNAL OF MATERIALS RESEARCH | 1994年 / 9卷 / 01期
关键词：
D O I：
10.1557/JMR.1994.0047
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The early stages of phase formation during mechanical alloying of Ti/Al powder blends were investigated using x-ray diffraction and transmission electron microscopy. After the initial formation of an hcp solid solution by the diffusion of Al into Ti, the first phase nucleated at the Ti/Al interface is a (partially) L1(2)-ordered fcc phase with a crystallite size of about 10-30 nm. This observation is ascribed to the kinetics of phase formation and the energetic destabilization of the equilibrium intermetallic compounds during milling due to chemical and structural disordering. A mechanism of phase formation during mechanical alloying is proposed, and comparisons are made with the thermal annealing behavior of Ti/Al multilayered thin films.
引用
收藏
页码：47 / 52
页数：6
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