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order-disorder Transformation for TiAl with L1_0 Structure at Stoichiometrical Composition

Rare Metals 2001年第3期20卷 147-151页

作者： Timothé e Nsongo, Xiaodong Ni,Guoliang Chen,Keh-Minn Chan 1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) Faculty of Science (Physics Department, P.O. Box 69 Brazzaville, 北京科技大学新金属材料国家重点实验室北京 100083 West-Virginia University 美国

The embedded atom method (EAM) was used to study the order-disorder transformation in gamma -TiAl alloy with L1(0). structure at stoichiometrical composition, and the effect of lattice constants was also investigated. It was found that the gamma -TiAl alloy at stoichiometrical composition exhibits a second-order transition, and the relations between lattice constants a, c and the long-range order sigma are not linear. The lattice constant a decreases whereas c increases with the increase of the long-range order parameter. In this case the ordering induces the transformation from cubic to tetragonal. The change of the lattice constant during the ordering processes can be interpreted in terms of bond length.

关键词： order-disorder transformation TiAl long-range order intermetallic

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Influence of Aluminum Content in γ-TiAl with L1_0 Structure during ordering Processes

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Rare Metals 2001年第4期20卷 230-235页

作者： Timothée Nsongot1,2 Xiaodong Ni1,3 Guoliang Chen1, Keh-Minn Chang4 1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) Faculty of Science, P. 0. Box 69, Brazzaville, Congo 北京科技大学新金属材料国家重点实验室北京 100083 West-Virginia University 美国

Based on EAM (embedded atom method) interatomic potential, the effect of aluminum content on the type of order-disorder transformation (ODT) and the structure properties (lattice constants, volume, c/a ratio and configu- ration energy) during ordering processes was investigated for γ-TiAI based alloys. Results show that for the alloys with lower than 50%Al (all composition is in atom number fraction), the ODT is the first order transition, and the second order transition for the alloys with equal or higher than 50% Al. The increase of aluminum content results in the critical temperature increasing. The aluminum content has a very little effect on the lattice constants, the volume and the c/a ratio, but has a significant effect on the configuration energy. A metastable disordered state was found for the alloys with less than 50%Al.

关键词： TiA1 order-disorder transformation long-range order

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ATOMIC orderING AND DISorderING OF INTERMETALLIC PHASES

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 261-272页

作者： RW Cahn(Department of Materials Science Metallurgy, University of Cambridge, UK)

All intermetallic phases have a tendency to atomic long-range ordering, according to the ordering energy, they may be permanently ordered (up to the melting-point) or reversibly ordered (up to a critical temperature). The paper considers ways of disordering intermetallic phases, in relation to the ordering energy and diffusivities, and some properties of partially ordered intermetallic phases (including mechanical properties) The kinetics of re-ordering of disordered starting material will be examined,including sluggishly ordering phases (which can be aided by concurrent irradiation). The circumstances under which a partially disordered intermetallic phase may transform into an amorphous form will be outlined.

关键词： long-range order ordering disorder trapping partial order

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