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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 4    August 2002

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Synthesis of amorphous Ti-Al alloys by
mechanical alloying of elemental powders
ZHANG Jun-hong(张俊红),HUANG Bai-yun(黄伯云),HE Yue-hui(贺跃辉),
ZHOU Ke-chao(周科朝),LIU Yong(刘  咏)

State Key Laboratory for Powder Metallurgy, Central South University, 
Changsha 410083, China

Abstract:Blended elemental powders with the nominal compositions (mole fraction, %) of Ti54Al46, Ti52Al48 and Ti50Al50 were mechanically alloyed in a planetary ball milling system for up to 100h.The structure evolution in these powders was characterized by scanning electron microscope, X-ray diffraction and differential thermal analysis techniques. It was found that elemental powders were progressively trans formed into nanocrystalline Ti(Al) supersaturated solid solution, then into amorphous phase. With increasing Al content, the formation of a fully Ti(Al) supersaturated solid solution and amorphous phase were accelerated, which are attributed to the fine grain size. And the grain size condition for formation of amorphous phase in this system is ≤16nm.

 

Key words: Ti-Al alloy; mechanical alloying; amorphisation

ISSN 1672-7029
CN 43-1423/U

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