Transmission electron microscopy observations of strain-induced martensitic formation in fatigued Fe21Mn2.5Al alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)125-130
Journal / PublicationMaterials Science and Engineering
Volume102
Issue number1
Publication statusPublished - Jun 1988
Externally publishedYes

Abstract

Austenitic Fe21Mn2.5Al0.04C alloy was cyclically deformed at various total strain amplitudes. The microstructural changes induced by fatigue at room temperature were examined by transmission electron microscopy. A considerable amount of faulting was evident in Fe21Mn2.5Al0.04C alloy (where the composition is in approximate weight per cent) cycled at a total strain amplitude of 0.3%, and the pile-up of stacking faults leads to the nucleation of ε-martensite. As the applied strain amplitude was increased to 0.6%, α′-martensite laths with a substructure consisting of dislocations were formed at the intersection of the ε-martensite bands. On further increase in the applied total strain amplitude to 2.5%, transmission electron microscopy observations revealed the presence of a cell structure in the faulted austenitic matrix. © 1988.