Control of dilation anisotropy in the martensitic transformation region in the Ni-Mn-Ga-Si alloy
Musabirov I. I.
11Institute for Metal Superplasticity Problems, Russian Academy of Sciences, Ufa, Bashkortostan, Russia
Email: irekmusabirov@mail.ru
Martensitic transformation in Heusler alloys can be accompanied by various functional effects promising for practical application. However, this is hampered by high thermocycle brittleness in the as-cast state. This paper presents the results of a comparison of the dilation properties in the martensitic transformation region of a Ni-Mn-Ga-Si alloy in a coarse-grained state and with a bimodal structure possessing reduced thermocycle brittleness. It is shown that the formation of a bimodal structure by hot forging (700 oC, e = 3.2) results in the development of internal stresses (microstresses) of a preferred orientation, leading to the formation of martensite twins' transverse to the compression axis of the final forging stage. A rod-shaped specimen cut along this direction is abruptly compressed, while one cut across it, on the contrary, is elongated during the direct martensitic transformation. Thus, using hot forging it is possible to control the dilation anisotropy in the process of martensitic transformation of the Heusler Ni-Mn-Ga. Keywords: Ni-Mn-Ga alloy, Heusler alloy, martensitic transformation, dilation, microstresses.
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