Characterization of Gas Atomized Ni-Mn-Ga Powders

F. Nilsén; I. Aaltio; Y. Ge; Tomi Lindroos; S.P. Hannula

doi:10.1016/j.matpr.2015.07.422

Characterization of Gas Atomized Ni-Mn-Ga Powders

F. Nilsén (Corresponding Author), I. Aaltio, Y. Ge, Tomi Lindroos, S.P. Hannula

Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

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)	S879-S882
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, ICOMAT 2014 - Bilbao, Spain Duration: 6 Jul 2014 → 11 Jul 2014

Keywords

Ni-Mn-Ga
gas atomization
magnetic properties
microsturcture
ProperPart

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10.1016/j.matpr.2015.07.422

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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.",

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author = "F. Nils{\'e}n and I. Aaltio and Y. Ge and Tomi Lindroos and S.P. Hannula",

year = "2015",

doi = "10.1016/j.matpr.2015.07.422",

language = "English",

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TY - JOUR

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

AU - Nilsén, F.

AU - Aaltio, I.

AU - Ge, Y.

AU - Lindroos, Tomi

AU - Hannula, S.P.

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

KW - ProperPart

UR - https://www.sciencedirect.com/journal/materials-today-proceedings/vol/2/suppl/S3

U2 - 10.1016/j.matpr.2015.07.422

DO - 10.1016/j.matpr.2015.07.422

M3 - Article

SN - 2214-7853

VL - 2

SP - S879-S882

JO - Materials Today: Proceedings

JF - Materials Today: Proceedings

IS - Supplement 3

T2 - International Conference on Martensitic Transformations, ICOMAT 2014

Y2 - 6 July 2014 through 11 July 2014

ER -

Characterization of Gas Atomized Ni-Mn-Ga Powders

Abstract

Keywords

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