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

by: Yuttanant Boonyongmaneerat, Markus Chmielus, David C Dunand, Peter Müllner

Physical Review Letters, Vol. 99, No. 24. (2007)

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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.

@article{citeulike:2751747, 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.}, author = {Boonyongmaneerat, Yuttanant and Chmielus, Markus and Dunand, David C. and M\"ullner, Peter }, citeulike-article-id = {2751747}, doi = {10.1103/PhysRevLett.99.247201}, journal = {Physical Review Letters}, keywords = {2007, alloy, foam, focus, structure}, number = {24}, posted-at = {2008-05-04 01:06:40}, priority = {2}, publisher = {APS}, title = {Increasing Magnetoplasticity in Polycrystalline Ni-Mn-Ga by Reducing Internal Constraints through Porosity}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000099000024247201000001\&idtype=cvips\&gifs=yes}, volume = {99}, year = {2007} }

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TY - JOUR ID - citeulike:2751747 L3 - citeulike-article-id:2751747 TI - Increasing Magnetoplasticity in Polycrystalline Ni-Mn-Ga by Reducing Internal Constraints through Porosity JF - Physical Review Letters VL - 99 IS - 24 PB - APS N2 - 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. KW - 2007 KW - alloy KW - foam KW - focus KW - structure AU - Boonyongmaneerat, Yuttanant AU - Chmielus, Markus AU - Dunand, David AU - M\"ullner, Peter PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000099000024247201000001&idtype=cvips&gifs=yes ER -

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