Characterization of Gas Atomized Ni-Mn-Ga powders

Frans Nilsén; Ilkka Aaltio; Yanling Ge; Tomi Lindroos; Simo-Pekka Hannula

doi:10.1016/j.matpr.2015.07.422

Characterization of Gas Atomized Ni-Mn-Ga powders

Frans Nilsén, Ilkka Aaltio, Yanling Ge, Tomi Lindroos, Simo-Pekka Hannula

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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.

Original language	English
Pages (from-to)	879-882
Number of pages	4
Journal	Materials Today: Proceedings
Volume	2
Issue number	Supplement 3
DOIs	https://doi.org/10.1016/j.matpr.2015.07.422
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed
Event	International Conference on Martensitic Transformations - Bilbao, Spain Duration: 7 Jul 2014 → 11 Jul 2014

Keywords

Ni-Mn-Ga
gas atomization
magnetic properties
microsturcture

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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",

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note = "International Conference on Martensitic Transformations, ICOMAT ; Conference date: 07-07-2014 Through 11-07-2014",

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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

IS - Supplement 3

T2 - International Conference on Martensitic Transformations

Y2 - 7 July 2014 through 11 July 2014

ER -

Characterization of Gas Atomized Ni-Mn-Ga powders

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