Shape memory effect associated with a deformation at a temperature just below A[sub S] in a Fe-Mn-Cr-Si-Ni shape memory alloy
- G.E.M.P.P.M., Villeurbanne (France)
The shape memory effect of Fe-Mn based shape memory alloys is due to the formation of stress-induced [var epsilon]-martensite by deformation and to its reversion by heating over A[sub f], which permit it to recover a part of the original shape. The shape memory effect is directly associated with the [gamma][yields][var epsilon] transformation. For this reason, the authors have established the best conditions to induce the [var epsilon]-martensite inside an austenitic matrix: the deformation must take place at a temperature close to the M[sub s]. It has been established that a deformation made at a higher temperature degrades the shape memory effect. The purpose of this paper is to evaluate the shape memory effect in the case of a deformation applied at a relatively high temperature (just below A[sub s]) on samples containing a high volume fraction of [var epsilon]-martensite before the deformation. It is shown that an other mechanism of shape memory effect occurs in these conditions and allows to reach an interesting shape memory effect ([approximately]2%).
- OSTI ID:
- 7108837
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 31:1; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM ALLOYS
DEFORMATION
SHAPE MEMORY EFFECT
IRON BASE ALLOYS
MANGANESE ALLOYS
NICKEL ALLOYS
SILICON ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
EXPERIMENTAL DATA
ALLOYS
DATA
INFORMATION
IRON ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties