Open Access
Article Number 05028
Number of page(s) 7
Section Applied Research and Applications: Engineering Materials with MT
Published online 01 September 2009
ESOMAT 2009, 05028 (2009)
DOI: 10.1051/esomat/200905028

Influence of minor additions of boron and zirconium on shape memory properties and grain refinement of a Cu-Al-Mn shape memory alloy

V. Sampath1 and U.S. Mallik2

1  Department of Metallurgical and Materials Engineering, I.I.T. Madras, Chennai – 600036, India
2  Department of Mechanical Engineering, S.I.T, Tumkur-572103, India

Published online: 1 September 2009

Cu-base alloys with 12.5 wt. % Al and 5 wt. % Mn with different amounts (0.05-2.00 wt.%) of boron or zirconium were prepared by ingot metallurgy route. The alloy ingots were homogenized followed by step quenching so as to obtain a structure that is completely martensitic. They were subsequently characterized by optical emission spectrophotometry, differential scanning calorimetry and optical microscopy. The shape memory and superelastic properties of the alloys were studied by bend and tensile test. The present study brings to light that boron acts as a good grain refiner, resulting in a reduction of about 80% in grain size. While it also increases the transformation temperatures by ~ 10°C, it decreases the strain recovery by shape memory effect by 4%, and that by superelasticity by ~ 2%. A comparison of the results of the alloy with B addition with that with Zr addition reveals that B is a better grain refiner for Cu-Al-Mn SMAs.

© Owned by the authors, published by EDP Sciences 2009