EPJ Special Topics

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Eur. Phys. J. Special Topics 158, 93-98 (2008)
DOI: 10.1140/epjst/e2008-00659-1

Effect of deformation on structure and mechanical behavior of polycrystalline Ni-Mn-Ga alloys

H. Morawiec, T. Goryczka, J. Lelatko, K. Prusik and A. Drdzen

University of Silesia, Institute of Materials Science, Bankowa 12, 40-007 Katowice, Poland

(Published online: 1 May 2008)

Abstract
Deformation of polycrystalline Ni-Mn-Ga alloys was studied for both the ${\rm L2}_{1}$ parent phase and 10 M martensitic state. The effect of deformation by compression up to the fracture on mechanical behavior and structure change was studied for the inhomogeneous as-cast state and after annealing at $900\,^\circ{\rm C}$ for 50 hours. The structure, after deformation of the parent phase, observed by TEM reveals the presence of 10 M and 14 M martensite in the matrix, whereas the deformation of 10 M martensite does not show the change of the structure type. The stress-strain curves were analyzed and compared with the earlier published results.