J. Phys. IV France
Volume 05, Numéro C8, Décembre 1995
International Conference on Martensitic Transformations – ICOMAT 95
Page(s) C8-439 - C8-444
International Conference on Martensitic Transformations

J. Phys. IV France 05 (1995) C8-439-C8-444

DOI: 10.1051/jp4:1995866

Optical Microscope Study of the γ(FCC)←→ε Martensitic Transformation of a Fe-16%Mn-9%Cr-5%Si-4%Ni Shape Memory Alloy

N. Bergeon and G. Guenin

Laboratoire GEMPPM/INSA, Bât. 502, 69621 Villeurbanne cedex, France

The γ←(FCC)→ε(HC) transformation is studied by light optical microscopy and scanning electron microscopy in a polycrystalline Fe-Mn-Si-Cr-Ni shape memory alloy. Thermal and stress-induced martensites are both studied to point out differences. A color etching method permitted to clearly observe morphological evolutions during the transformation and its reversion. Deformations of a golden microgrid deposed on austenitic samples are observed by SEM during the transformation. This technic has led to point out microscopic differences concerning the two kinds of martensite. SEM results are used to explain light optical microscopy observations.

© EDP Sciences 1995