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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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Site occupations and ordering behaviour of
O
phase in Ti2AlNb-based intermetallics
WU Bo(吴  波)1,SHEN Jian-yun(沈剑韵)1,ZHANG Zhu(张  翥)1
SUN Jun(孙  军)1,SHANG Shun-li(商顺利)1,  PENG De-lin(彭德林

1. General Research Institute for Non-ferrous Metals, Beijing 100088, China;
2. State Key Laboratory for Precision Hot Processing of Metals,
Harbin Institute of Technology, Harbin 150001, China

Abstract:The site occupations of the alloying elements of O phase in Ti2AlNb-based intermetallics are clarified. The ordering behaviours of the O phase in Ti-yAl-zNb(y≥25%, mole fraction) orthorhombic alloys are also investigated with a Bragg-Williams model. In the temperature range where the O phases exist, the order parameters change with the alloy composition and temperature continuously, and the first-order transition character is very “weak” .

 

Key words: Ti2AlNb-based intermetallics;orthorhombic phase;site occupation;ordering behaviour

ISSN 1672-7029
CN 43-1423/U

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