Thermal evidence for the structural instability in Ni3 Al alloys

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Ramesh, R. and Pathiraj, B. and Kolster, B.H. and Maas, J.H. (1992) Thermal evidence for the structural instability in Ni3 Al alloys. Materials Science and Engineering A: Structural materials, 152 (1-2). pp. 60-66. ISSN 0025-5416

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Abstract:The thermal expansion coefficient (¿) and calorimetric data were obtained as a function of temperature in order to clarify some of the significant variations reported with regard to these values in the literature. Stoichiometric and off-stoichiometric compositions of Ni3Al alloys (with and without boron addition) were investigated. Dilatometric experiments were performed on all the alloys and the ¿ values were estimated over the temperature range from ambient to 1000°C. Two runs were made on each sample under different initial conditions and differences in ¿ values were noticed. The results were analysed based on our earlier X-ray diffraction results. Additional isothermal dilatometric tests were also carried out and a significant volume change was noticed (0.45% contraction) when the alloy quenched from 1000°C was heated to 600°C and held for a long duration. The calorimetric data were obtaindd over the same range of temperature and enthalpy changes, though less distinct, were noticed at around 360, 660 and 900°C. The variations seen further augment our earlier results on the instability of the L12 structure and the existence of a structural transformation
Item Type:Article
Copyright:© 1992 Elsevier Science
Faculty:
Engineering Technology (CTW)
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Link to this item:http://purl.utwente.nl/publications/32133
Official URL:http://dx.doi.org/10.1016/0921-5093(92)90047-5
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