Title: Phenomenological approach to the coexistence of 2 types of martensites in cu-zn-al-mn alloys
Authors: Segui, C ×
Cesari, E
Van Humbeeck, Jan #
Issue Date: Oct-1991
Publisher: Japan inst metals
Series Title: Materials transactions jim vol:32 issue:10 pages:898-904
Abstract: Certain compositions of polycrystalline Cu-Zn-Al-Mn alloys have been found to transform, on stress-free cooling, to a mixture of two types of martensites, 18R (beta') and 2H (gamma'). Due to the different thermal hysteresis shown by the beta reversible beta' and beta reversible gamma' transformations, the corresponding reverse transformations take place separately. The coexistence of two types of martensites has been investigated by means of non-conventional differential scanning calorimetry. The relative amount of each phase existing in the martensite product depends on composition and thermal treatment, ageing promoting the beta' martensite at the expense of the gamma'. To get a better understanding of this phenomena, a phenomenological model, based on the Gibbs free energy balance currently accepted for thermoelastic transformations, has been applied. The model gives an insight on the influence of different physical effects, either chemical (changes in the relative stability of the related phases) and non-chemical (frictional and elastic energy contributions), on the final relative fraction of each martensite and on the transformation temperatures.
ISSN: 0916-1821
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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