Effects of B2 nanoprecipitates on the phase stability and pseudoelastic behavior of Fe-Mn-Al-Ni shape memory alloys

P. La Roca; J. Medina; C.E. Sobrero; M. Avalos; J.A. Malarria; A. Baruj; M. Sade

doi:10.1051/matecconf/20153304005

All issues

Volume 33 (2015)

MATEC Web of Conferences, 33 (2015) 04005

Abstract

Open Access

Issue		MATEC Web of Conferences Volume 33, 2015 ESOMAT 2015 – 10^th European Symposium on Martensitic Transformations


Article Number		04005
Number of page(s)		6
Section		Fe-based alloys
DOI		https://doi.org/10.1051/matecconf/20153304005
Published online		07 December 2015

MATEC Web of Conferences 33, 04005 (2015)

Effects of B2 nanoprecipitates on the phase stability and pseudoelastic behavior of Fe-Mn-Al-Ni shape memory alloys

P. La Roca¹^,2, J. Medina³, C.E. Sobrero⁴, M. Avalos⁴, J.A. Malarria⁴, A. Baruj¹^,2 and M. Sade¹^,2^a

¹ Centro Atómico Bariloche - CNEA and Instituto Balseiro (UNCuyo), 8400 S. C. de Bariloche, Río Negro, Argentina
² Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
³ Universidad Nacional del Nordeste, Corrientes, Argentina
⁴ Instituto de Física Rosario – CONICET-UNR, Rosario, Argentina

^a Corresponding author: sade@cab.cnea.gov.ar

Abstract

Samples of a Fe-Mn₃₆-Al₁₅-Ni_7.5 shape memory alloy were subjected to different thermal treatments at 200ºC (namely for 0 min, 10 min, 20 min and 3 h) in order to evaluate the evolution of the coherent precipitates related to the pseudoelastic behavior. After performing the thermal treatments, samples were studied by means of electrical resistivity in experiments aimed at evaluating the effect of precipitation on the martensitic transformation temperatures and at determining the possible effects of thermal cycling. Mechanical tests were performed to measure the degree of pseudoelastic recovery for each thermally treated sample. Evidences of pseudoelastic behavior were found even in samples subjected to a rather short treatment such as 20 min after three thermal cycles. Transmission electron microscopy (TEM) observations were performed in order to identify the distribution and size of B2 nano-precipitates after the various thermal treatments.

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