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RESEARCH ON KINETICS OF MICROSTRUCTURAL EVOLUTION IN THE Ni_3Al ALLOY PREPARED BY COMBUSTION SYNTHESIS |
WANG Xuecheng; CHAI Huifen; WANG Xiaotian (Xi'an Jiaotong University; Xi'an710049)(Manuscript received 1994-09-23) |
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Cite this article:
WANG Xuecheng; CHAI Huifen; WANG Xiaotian (Xi'an Jiaotong University; Xi'an710049)(Manuscript received 1994-09-23). RESEARCH ON KINETICS OF MICROSTRUCTURAL EVOLUTION IN THE Ni_3Al ALLOY PREPARED BY COMBUSTION SYNTHESIS. Acta Metall Sin, 1995, 31(19): 300-304.
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Abstract The alloy of Ni-25at.-% Al was prepared by combustion synthesis with self-propagating way, and the evolution of microstructure in as-prepared specimen along with end-quenching was investigated. It was shown that the synthesizing process went from forming a rich-aluminium solution,then gradually transformed into Ni_3Al product through some transition-reactions, these transition-reactions can produce the more rich-nickel aluminides, and their reacting-rate has the dependence on state and mass-transfer way of reactants. Results also indicated that it is the key mechanism of reaction with higher reacting-rate that the reactants and some transition-phase melted and fast spreaded to the surface of Ni particles. (Correspondent: WANG Xuecheng, Lecture, School of Mat Sci Eng, Xi'an Jiaotong University, Xi'an 710049)
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