Si content dependence on shape memory and tensile properties in Fe-Mn-Si-C alloys

M. Koyama, T. Sawaguchi, K. Tsuzaki

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


Fe-17Mn-xSi-0.3C alloys (x= 0, 2, 4, 6. mass%) were used to investigate the influence of Si on the tensile properties and the shape recovery strain. We considered three kinds of tensile properties: critical stress for e{open}-martensitic transformation, critical stress for dislocation gliding, and work hardening rate. A significant increase in the shape recovery strain was obtained in the 6%Si added alloy, when the alloys were heated to 873. K after a pre-straining of 8% in tension. The critical stresses for both the e{open}-martensitic transformation and the dislocation gliding increased with an increase in Si content from 0 to 4% but were similar in the 4%Si and 6%Si added alloys. However, the work hardening rate between the 4%Si and 6%Si added alloys was significantly different and was much smaller in the 6%Si added alloy. Hence, a 6%Si addition suppresses the plastic deformation due to the dislocation gliding through the decrease in the work hardening rate along with the solution hardening. As a result, e{open}-martensitic transformation occurs as the predominant deformation mode at smaller strains and improves the shape recovery strain.

Original languageEnglish
Pages (from-to)2882-2888
Number of pages7
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Issue number6
Publication statusPublished - 2011 Mar 15


  • e{open}-Martensitic transformation
  • Shape memory effect
  • Solution hardening
  • Work hardening


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