Open AccessАнизотропия термического расширения поликристаллического сплава системы Ni-Mn-Ga, подвергнутого пластической деформации ковкой
Author(s) -
I. I. Musabirov,
И. М. Сафаров,
Р. М. Галеев,
Ramil Gaisin,
В. В. Коледов,
Р.Р. Мулюков
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.06.45975.28m
Subject(s) - alloy , materials science , forging , isothermal process , metallurgy , phase (matter) , diffusionless transformation , texture (cosmology) , transformation (genetics) , martensite , anisotropy , thermal stability , crystallography , microstructure , thermodynamics , chemical engineering , chemistry , computer science , biochemistry , physics , organic chemistry , quantum mechanics , artificial intelligence , gene , engineering , image (mathematics)
The formation of a sharp crystallographic texture in a Ni–Mn–Ga Heusler alloy by the multiple isothermal forging has been studied. An analysis of the thermal expansion near the martensitic transformation temperatures in the as-cast and forged states of the alloy shows that the thermomechanical treatment leads to an increase in the anisotropy of the sample geometric size changing during the phase transformation, which favors an increase in the functional characteristics of the alloy. The structural studies show that the alloy structure after multiple isothermal forging has the bimodal distribution of grain sizes. The formation of the bimodal structure by forging is assumed to make it possible to enhance the stability of the functional properties of the alloy during repeated cycles of the phase transformation.