Stabilizing a fine twin structure in Ni–Mn–Ga samples by coatings and ion implantation

The surfaces of Ni–Mn–Ga samples were coated with hard TiN and soft elastomer and implanted Nb+ ions. All of these treatments stabilized a dense twin structure. After removing the treated surface layers, the original coarse twin structure reappeared. Compression tests of the ion-implanted sample wit...

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Bibliographic Details
Published inScripta materialia Vol. 94; no. C; pp. 40 - 43
Main Authors Ullakko, K., Chmielus, M., Müllner, P.
Format Journal Article
LanguageEnglish
Published United States Elsevier Ltd 01.01.2015
Elsevier
Subjects
Coatings
Ferromagnetic shape memory
Flats
Ion implantation
Nickel
Stress strain curves
Stress-strain relationships
Surface layer
Surface modifications
Twin boundaries
Twin stabilization
Twinning
Surface modifications
Ion implantation
Twinning
Twin stabilization
Ferromagnetic shape memory
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Summary:The surfaces of Ni–Mn–Ga samples were coated with hard TiN and soft elastomer and implanted Nb+ ions. All of these treatments stabilized a dense twin structure. After removing the treated surface layers, the original coarse twin structure reappeared. Compression tests of the ion-implanted sample with fine twins exhibited a continuously increasing, smooth stress–strain curve. Without the surface layer, the stress–strain curve was more rugged and flat, the twinning stress decreased, and one twin boundary moved throughout the entire sample.
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USDOE
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2014.09.013