Calculation on the solid solution forming enthalpies of Re-Mo-Ti gradient alloy in thermodynamics |
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Authors: | Shang-lei Yang Song-nian Lou |
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Institution: | (1) School of Natural Sciences, The University of Western Sydney, Penrith South DC, NSW, 1797, Australia;(2) Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia |
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Abstract: | The idea about preparation of Re-Mo-Ti alloy is put forward because of applications of Re and Mo-Re alloys in aerospace. Basing
on the thermodynamics theory, the feasibility of developing a new high temperature alloy Re-Mo-Ti is investigated. The solid
solution forming enthalpies of binary alloys Re-Ti, Mo-Ti and Mo-Re are calculated with the Miedema thermodynamics theory.
The Miedema theory of binary alloy can be used in ternary alloy through Kohler model or Toop model. The calculated results
show that the forming enthalpies of binary alloys Re-Ti, Ti-Mo and Re-Mo are negative, which indicates that binary alloys
Re-Ti, Ti-Mo and Re-Mo can form solid solution in wider component area. The forming enthalpies of Re-Mo-Ti ternary alloy are
still negative and smaller than those of binary alloys Re-Ti, Ti-Mo or Re-Mo, which indicates it is possible to form large
solid solution graph area among ternary alloys of Ti, Mo, Re elements. It is feasible to develop a new high temperature material
in thermodynamics, in this material Re-Mo-Ti solid solution as base phase, and the Ti5Re24 intermetallic compounds or interphase ω (Ti4Mo3) as strengthening phase. |
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