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Numéro
J. Phys. IV France
Volume 112, October 2003
Page(s) 929 - 934
DOI https://doi.org/10.1051/jp4:20031033


J. Phys. IV France 112 (2003) 929
DOI: 10.1051/jp4:20031033

Calorimetric evaluation of the Ga-Mn-Ni alloys

M. Friman and M. Hämäläinen

Helsinki University of Technology, Department of Materials Science and Rock Engineering, P. O. Box 6200, 02015 Hut, Finland


Abstract
Thermodynamic properties of the Ga 20.33-Mn 28.73-Ni 50.94 alloy were studied using thermodynamic calculations and differential scanning calorimetric (DSC) measurements. The Ga 20.33-Mn 28.73-Ni 50.94 alloy had two step martensite $\rightarrow$ austenite transformation at T = 343... 413 K. Measurements were carried out using two heating rates, 0.2 and 1.0 K/min. Calculated transformation temperatures with constant gallium amount, ${\rm Ga} = 20.33$ at%, were compared to experimental results at the same composition. Transformation energies and phase transformation temperatures obtained were -7.92 J/g at 0.2 K/min and -9.80 J/g at 1.0 K/min.



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