• Featured in Physics

Increasing Magnetoplasticity in Polycrystalline Ni-Mn-Ga by Reducing Internal Constraints through Porosity

Yuttanant Boonyongmaneerat, Markus Chmielus, David C. Dunand, and Peter Müllner
Phys. Rev. Lett. 99, 247201 – Published 10 December 2007
Physics logo

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 2 October 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.247201

©2007 American Physical Society

Authors & Affiliations

Yuttanant Boonyongmaneerat1,*, Markus Chmielus2,†, David C. Dunand1, and Peter Müllner2

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
  • 2Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA

  • *Present address: Metallurgy and Materials Science Research Institute, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand.
  • Also at Hahn-Meitner-Institut, Smart Magnetic Materials Group, SF1, 14109, Berlin, Germany.

See Also

Stretching More with Pores

Michael Schirber
Phys. Rev. Focus 20, 20 (2007)

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 99, Iss. 24 — 14 December 2007

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×