The influence of forging and extrusion on the microstructure and martensitic transformation in Ni-Mn-Ga alloys

The work presents the comparative analysis of the microstructure and character of martensitic transformation in Heusler Ni-Mn-Ga alloys subjected to plastic deformation by forging and complex treatment by forging with subsequent extrusion. It is shown that the treatment by forging leads to the forma...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 447; no. 1; pp. 12024 - 12027
Main Authors Musabirov, I I, Safarov, I M, Galeyev, R M, Abdullina, D R, Koledov, V V, Mulyukov, R R
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 21.11.2018
Subjects
Extrusion
Forging
Gallium
Heat treating
Low temperature
Manganese
Martensite
Martensitic transformations
Microstructural analysis
Microstructure
Nickel base alloys
Plastic deformation
Thermomechanical treatment
Transformation temperature
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Summary:The work presents the comparative analysis of the microstructure and character of martensitic transformation in Heusler Ni-Mn-Ga alloys subjected to plastic deformation by forging and complex treatment by forging with subsequent extrusion. It is shown that the treatment by forging leads to the formation of a bimodal structure with large grains of several micrometres surrounded by a fine-grained structure. After a complex treatment, a bimodal structure is also observed. But the volume fraction of the fine-grained structure is larger than in the previous case. Analysis of the martensite transformation temperature shows that thermomechanical treatment by both methods leads to a slight shift in the martensite transformation temperature to the low temperature region.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/447/1/012024