Characterization of Gas Atomized Ni-Mn-Ga Powders

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

Research output: Contribution to journalArticleScientificpeer-review

6 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 languageEnglish
Pages (from-to)S879-S882
JournalMaterials Today: Proceedings
Volume2
Issue numberSupplement 3
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed
EventInternational Conference on Martensitic Transformations, ICOMAT 2014 - Bilbao, Spain
Duration: 6 Jul 201411 Jul 2014

Fingerprint

Powders
Gases
Atomization
Magnetic properties
Heat treatment
Rapid solidification
Ball milling
Particle size analysis
Temperature
Particles (particulate matter)
Sintering
Microstructure

Keywords

  • Ni-Mn-Ga
  • gas atomization
  • magnetic properties
  • microsturcture
  • ProperPart

Cite this

Nilsén, F., Aaltio, I., Ge, Y., Lindroos, T., & Hannula, S. P. (2015). Characterization of Gas Atomized Ni-Mn-Ga Powders. Materials Today: Proceedings, 2(Supplement 3), S879-S882. https://doi.org/10.1016/j.matpr.2015.07.422
Nilsén, F. ; Aaltio, I. ; Ge, Y. ; Lindroos, Tomi ; Hannula, S.P. / Characterization of Gas Atomized Ni-Mn-Ga Powders. In: Materials Today: Proceedings. 2015 ; Vol. 2, No. Supplement 3. pp. S879-S882.
@article{02eee57deeab458fa2d760d0d83d9496,
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, ProperPart",
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",
volume = "2",
pages = "S879--S882",
journal = "Materials Today: Proceedings",
issn = "2214-7853",
publisher = "Elsevier",
number = "Supplement 3",

}

Nilsén, F, Aaltio, I, Ge, Y, Lindroos, T & Hannula, SP 2015, 'Characterization of Gas Atomized Ni-Mn-Ga Powders', Materials Today: Proceedings, vol. 2, no. Supplement 3, pp. S879-S882. https://doi.org/10.1016/j.matpr.2015.07.422

Characterization of Gas Atomized Ni-Mn-Ga Powders. / Nilsén, F. (Corresponding Author); Aaltio, I.; Ge, Y.; Lindroos, Tomi; Hannula, S.P.

In: Materials Today: Proceedings, Vol. 2, No. Supplement 3, 2015, p. S879-S882.

Research output: Contribution to journalArticleScientificpeer-review

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

VL - 2

SP - S879-S882

JO - Materials Today: Proceedings

JF - Materials Today: Proceedings

SN - 2214-7853

IS - Supplement 3

ER -