Increasing magnetoplasticity in polycrystalline Ni-Mn-Ga by reducing internal constraints through porosity

Yuttanant Boonyongmaneerat*, Markus Chmielus, David C Dunand, Peter Müllner

*Corresponding author for this work

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

Foams with 55% and 76% open porosity were produced from a Ni-Mn-Ga magnetic shape-memory alloy by replication casting. These polycrystalline martensitic foams display a fully reversible magnetic-field-induced strain of up to 0.115% without bias stress, which is about 50 times larger than nonporous, fine-grained Ni-Mn-Ga. This very large improvement is attributed to the bamboolike structure of grains in the foam struts which, due to reduced internal constraints, deform by magnetic-field-induced twinning more easily than equiaxed grains in nonporous Ni-Mn-Ga.

Original languageEnglish (US)
Article number247201
JournalPhysical Review Letters
Volume99
Issue number24
DOIs
StatePublished - Dec 10 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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