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
Issue number1
Publication statusPublished - Jun 1988
Externally publishedYes


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.