The influence of rare earth element on shape memory effect in Fe-Mn-Si alloys

Journal Article · Tue Oct 13 04:00:00 EDT 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00332-7· OSTI ID:20023133

Zhou, W; Jiang, B; Qi, X; Hsu, T Y

Recently Fe-Mn-Si based shape memory alloys have been studied intensely. Unlike Ni-Ti and Cu-based alloys, the shape memory effect(SME) in Fe-Mn-Si based alloys is often associated with the stress induced martensite by the movement of preferred partial dislocation and its reverse motion during heating. In general, there are two effective ways to improve SME in Fe-Mn-Si alloys: (1) increasing the strength of matrix to inhibit the permanent slip of perfect dislocations to austenite during a shape change and (2) reducing the stacking fault energy to enhance the movement of partial dislocations. For Fe-Mn-Si-Re (rare earth element), Hsu suggested that Re may diminish the stacking fault energy, increase the amount of thermal or stress-induced martensite, lower the T{sub N} temperature of austenite and strengthen austenite. Consequently, the addition of rare earth element in Fe-Mn-Si may significantly improve the SME. In the present study rare earth elements were added to the Fe-Mn-Si alloy in order to investigate their effect on the shape memory effect.

• Research Organization: Shanghai Jiao Tong Univ. Shanghai (CN)
• OSTI ID: 20023133
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DISLOCATIONS
IRON ALLOYS
MANGANESE ALLOYS
MARTENSITE
METALLURGICAL EFFECTS
RARE EARTH ADDITIONS
SHAPE MEMORY EFFECT
SILICON ALLOYS
STRAINS
STRESSES