Highly porous spark plasma sintered Ni-Mn-Ga structures

Frans Nilsén; Joonas Lehtonen; Yanling Ge; Ilkka Aaltio; Simo Pekka Hannula

doi:10.1016/j.scriptamat.2017.06.040

Highly porous spark plasma sintered Ni-Mn-Ga structures

Frans Nilsén^*, Joonas Lehtonen, Yanling Ge, Ilkka Aaltio, Simo Pekka Hannula

^*Tämän työn vastaava kirjoittaja

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Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

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A new approach for the processing of porous crystalline Ni-Mn-Ga compacts by spark plasma sintering (SPS) from a mixture of gas atomized Ni-Mn-Ga and NaCl powders (25/75 vol%) is reported. The NaCl was removed to reveal a highly porous skeleton of Ni-Mn-Ga. Solid skeletons were heat-treated in vacuum to grow the grains to a size of 22–23 μm, from the 1.7 μm found in the powder. The sample with the highest porosity showed a magnetic-field-induced strain of 1.24%. The MFIS is attributed to magnetically induced twinning due to the reduction of grain boundary constraints and the formation of preferred orientation.

Alkuperäiskieli	Englanti
Sivut	148-151
Sivumäärä	4
Julkaisu	Scripta Materialia
Vuosikerta	139
DOI - pysyväislinkit	https://doi.org/10.1016/j.scriptamat.2017.06.040
Tila	Julkaistu - 1 lokak. 2017
OKM-julkaisutyyppi	A1 Julkaistu artikkeli, soviteltu

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10.1016/j.scriptamat.2017.06.040

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@article{7a215c992f144782836ceea0fb212588,

title = "Highly porous spark plasma sintered Ni-Mn-Ga structures",

abstract = "A new approach for the processing of porous crystalline Ni-Mn-Ga compacts by spark plasma sintering (SPS) from a mixture of gas atomized Ni-Mn-Ga and NaCl powders (25/75 vol%) is reported. The NaCl was removed to reveal a highly porous skeleton of Ni-Mn-Ga. Solid skeletons were heat-treated in vacuum to grow the grains to a size of 22–23 μm, from the 1.7 μm found in the powder. The sample with the highest porosity showed a magnetic-field-induced strain of 1.24%. The MFIS is attributed to magnetically induced twinning due to the reduction of grain boundary constraints and the formation of preferred orientation.",

keywords = "Ferromagnetic shape memory alloy, Magnetic-field-induced strain, Porous material, Spark plasma sintering",

author = "Frans Nils{\'e}n and Joonas Lehtonen and Yanling Ge and Ilkka Aaltio and Hannula, {Simo Pekka}",

year = "2017",

month = oct,

day = "1",

doi = "10.1016/j.scriptamat.2017.06.040",

language = "English",

volume = "139",

pages = "148--151",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Highly porous spark plasma sintered Ni-Mn-Ga structures

AU - Nilsén, Frans

AU - Lehtonen, Joonas

AU - Ge, Yanling

AU - Aaltio, Ilkka

AU - Hannula, Simo Pekka

PY - 2017/10/1

Y1 - 2017/10/1

N2 - A new approach for the processing of porous crystalline Ni-Mn-Ga compacts by spark plasma sintering (SPS) from a mixture of gas atomized Ni-Mn-Ga and NaCl powders (25/75 vol%) is reported. The NaCl was removed to reveal a highly porous skeleton of Ni-Mn-Ga. Solid skeletons were heat-treated in vacuum to grow the grains to a size of 22–23 μm, from the 1.7 μm found in the powder. The sample with the highest porosity showed a magnetic-field-induced strain of 1.24%. The MFIS is attributed to magnetically induced twinning due to the reduction of grain boundary constraints and the formation of preferred orientation.

AB - A new approach for the processing of porous crystalline Ni-Mn-Ga compacts by spark plasma sintering (SPS) from a mixture of gas atomized Ni-Mn-Ga and NaCl powders (25/75 vol%) is reported. The NaCl was removed to reveal a highly porous skeleton of Ni-Mn-Ga. Solid skeletons were heat-treated in vacuum to grow the grains to a size of 22–23 μm, from the 1.7 μm found in the powder. The sample with the highest porosity showed a magnetic-field-induced strain of 1.24%. The MFIS is attributed to magnetically induced twinning due to the reduction of grain boundary constraints and the formation of preferred orientation.

KW - Ferromagnetic shape memory alloy

KW - Magnetic-field-induced strain

KW - Porous material

KW - Spark plasma sintering

UR - http://www.scopus.com/inward/record.url?scp=85021455591&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2017.06.040

DO - 10.1016/j.scriptamat.2017.06.040

M3 - Article

AN - SCOPUS:85021455591

SN - 1359-6462

VL - 139

SP - 148

EP - 151

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Highly porous spark plasma sintered Ni-Mn-Ga structures

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