Characterization of Gas Atomized Ni-Mn-Ga powders

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Characterization of Gas Atomized Ni-Mn-Ga powders. / Nilsén, Frans; Aaltio, Ilkka; Ge, Yanling; Lindroos, Tomi; Hannula, Simo-Pekka.

In: Materials Today: Proceedings, Vol. 2, No. Supplement 3, 2015, p. 879-882.

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Nilsén, Frans ; Aaltio, Ilkka ; Ge, Yanling ; Lindroos, Tomi ; Hannula, Simo-Pekka. / Characterization of Gas Atomized Ni-Mn-Ga powders. In: Materials Today: Proceedings. 2015 ; Vol. 2, No. Supplement 3. pp. 879-882.

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@article{3af1d80c368a4ee892613d3b89b13df0,
title = "Characterization of Gas Atomized Ni-Mn-Ga powders",
abstract = "Gas atomization is a well-known process for obtaining high quality metallic powders. It produces spherical high-density particles with a controllable particle size distribution. We used gas atomization to obtain two different Ni-Mn-Ga powders and investigated their microstructure, transformation temperatures and magnetic properties as well as the effects of heat treatment on those. The phase and magnetic transformation temperatures of the powders were considerably lower as compared to similar conventionally prepared alloys. Nevertheless, heat treatment of the atomized powder was found to recover the magnetic properties of the materials, probably by releasing the residual strains generated by the rapid solidification during the gas atomization process. Sintering of powders seemed to start at a significantly lower temperature when compared to the powder prepared by ball milling of bulk Ni-Mn-Ga-alloys.",
keywords = "Ni-Mn-Ga, gas atomization, magnetic properties, microsturcture",
author = "Frans Nils{\'e}n and Ilkka Aaltio and Yanling Ge and Tomi Lindroos and Simo-Pekka Hannula",
year = "2015",
doi = "10.1016/j.matpr.2015.07.422",
language = "English",
volume = "2",
pages = "879--882",
journal = "Materials Today: Proceedings",
issn = "2214-7853",
publisher = "Elsevier",
number = "Supplement 3",

}

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TY - JOUR

T1 - Characterization of Gas Atomized Ni-Mn-Ga powders

AU - Nilsén, Frans

AU - Aaltio, Ilkka

AU - Ge, Yanling

AU - Lindroos, Tomi

AU - Hannula, Simo-Pekka

PY - 2015

Y1 - 2015

N2 - Gas atomization is a well-known process for obtaining high quality metallic powders. It produces spherical high-density particles with a controllable particle size distribution. We used gas atomization to obtain two different Ni-Mn-Ga powders and investigated their microstructure, transformation temperatures and magnetic properties as well as the effects of heat treatment on those. The phase and magnetic transformation temperatures of the powders were considerably lower as compared to similar conventionally prepared alloys. Nevertheless, heat treatment of the atomized powder was found to recover the magnetic properties of the materials, probably by releasing the residual strains generated by the rapid solidification during the gas atomization process. Sintering of powders seemed to start at a significantly lower temperature when compared to the powder prepared by ball milling of bulk Ni-Mn-Ga-alloys.

AB - Gas atomization is a well-known process for obtaining high quality metallic powders. It produces spherical high-density particles with a controllable particle size distribution. We used gas atomization to obtain two different Ni-Mn-Ga powders and investigated their microstructure, transformation temperatures and magnetic properties as well as the effects of heat treatment on those. The phase and magnetic transformation temperatures of the powders were considerably lower as compared to similar conventionally prepared alloys. Nevertheless, heat treatment of the atomized powder was found to recover the magnetic properties of the materials, probably by releasing the residual strains generated by the rapid solidification during the gas atomization process. Sintering of powders seemed to start at a significantly lower temperature when compared to the powder prepared by ball milling of bulk Ni-Mn-Ga-alloys.

KW - Ni-Mn-Ga

KW - gas atomization

KW - magnetic properties

KW - microsturcture

U2 - 10.1016/j.matpr.2015.07.422

DO - 10.1016/j.matpr.2015.07.422

M3 - Article

VL - 2

SP - 879

EP - 882

JO - Materials Today: Proceedings

JF - Materials Today: Proceedings

SN - 2214-7853

IS - Supplement 3

ER -

ID: 1475783