Title: Microscopic observation of gamma-phase and epsilon-martensite and alpha'-martensite in fe-mn-si-based shape-memory alloys
Authors: Jang, W.Y. ×
Gu, Q.
Van Humbeeck, Jan
Delaey, Lucas #
Issue Date: Mar-1995
Publisher: Elsevier science publ co inc
Series Title: Materials characterization vol:34 issue:2 pages:67-72
Abstract: The martensitic transformation occurring in Fe-Mn-Si-based shape memory alloy has been studied by microstructural characterization and by a color etching method developed to reveal the martensite structure. With this technique, gamma-, epsilon-martensite and alpha'-martensite can be easily distinguished and quantified. Two types of transformations, gamma --> epsilon and gamma --> epsilon --> alpha', occur in the studied alloys. The gamma --> epsilon transformation is observed in the specimen after annealing at high temperatures followed by air cooling to room temperature. Increasing annealing temperature enhanced the gamma --> epsilon transformation during cooling. Both gamma --> epsilon and gamma --> epsilon --> alpha' transformations are found after applying a certain amount of deformation strain. Increasing the amount of applied strain induced the gamma --> epsilon --> alpha' transformation more abundantly. The growth and intersection of alpha'-martensite is enhanced when the applied strain is large, During reverse heating, alpha'-martensite directly transformed back to gamma without reverting through epsilon-martensite.
ISSN: 1044-5803
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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