Journal
ACTA MATERIALIA
Volume 55, Issue 11, Pages 3883-3889Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2007.03.001
Keywords
ferromagnetic shape memory alloys; NiMnGa; atomic order; quenching
Ask authors/readers for more resources
The evolution of the degree of L2(1) long-range atomic order and its influence on the martensitic transformation and Curie temperatures of a near-stoiebiometric Ni2MnGa shape memory alloy were studied during several thermal treatments. Both temperatures depend on the quenching temperature and increase on subsequent heating treatments. This increase is concurrent with the presence of an exothermic peak in differential scanning calorimetry measurements. Neutron diffraction experiments were carried out in order to correlate the evolution of the transformation temperatures with the evolution of the L2(1) order degree, which was estimated through the intensity of the (111) and (200) reflections. The results confirm that the quenched-in degree of long-range atomic order depends on the quenching temperature and prove that the evolution of the transformation temperatures is due to the evolution of the atomic order. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available