Determination of α/β phase boundaries and mechanical characterization of Mg-Sc binary alloys

Yukiko Ogawa; Daisuke Ando; Yuji Sutou; Kyosuke Yoshimi; Junichi Koike

doi:10.1016/j.msea.2016.06.028

Determination of α/β phase boundaries and mechanical characterization of Mg-Sc binary alloys

Yukiko Ogawa, Daisuke Ando, Yuji Sutou, Kyosuke Yoshimi, Junichi Koike

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

14 Citations (Scopus)

Abstract

In this study, α(hcp)/β(bcc) phase boundaries of the Mg-Sc binary phase system were determined by Mg/Sc diffusion couple and conventional equilibrated alloy methods. It was confirmed that α/β phase boundaries exist in regions with a higher Mg content than those in reported diagram. The Mg-Sc alloy with a β single-phase showed tensile strength of 254 MPa and elongation of 25.4%. The tensile strength of the Mg-Sc alloy increased with increasing volume fraction of the α phase (f_α) and the alloy with a f_α of 34% showed high UTS of 310 MPa and elongation of 28.8%, properties which are better balanced than those of conventional Mg alloys. This improvement was suggested to be due to isotropic deformation of the β phase, small grain size and small c/a of the α phase.

Original language	English
Pages (from-to)	335-341
Number of pages	7
Journal	Materials Science and Engineering A
Volume	670
DOIs	https://doi.org/10.1016/j.msea.2016.06.028
Publication status	Published - 2016 Jul 18

Keywords

Magnesium alloys
Mechanical characterization
Phase diagram

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Determination of α/β phase boundaries and mechanical characterization of Mg-Sc binary alloys",

abstract = "In this study, α(hcp)/β(bcc) phase boundaries of the Mg-Sc binary phase system were determined by Mg/Sc diffusion couple and conventional equilibrated alloy methods. It was confirmed that α/β phase boundaries exist in regions with a higher Mg content than those in reported diagram. The Mg-Sc alloy with a β single-phase showed tensile strength of 254 MPa and elongation of 25.4%. The tensile strength of the Mg-Sc alloy increased with increasing volume fraction of the α phase (fα) and the alloy with a fα of 34% showed high UTS of 310 MPa and elongation of 28.8%, properties which are better balanced than those of conventional Mg alloys. This improvement was suggested to be due to isotropic deformation of the β phase, small grain size and small c/a of the α phase.",

keywords = "Magnesium alloys, Mechanical characterization, Phase diagram",

author = "Yukiko Ogawa and Daisuke Ando and Yuji Sutou and Kyosuke Yoshimi and Junichi Koike",

note = "Funding Information: This work was supported by KAKENHI ( 15H05549 ) and Tohoku University Division for International Advanced Research and Education ( DIARE ).",

year = "2016",

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doi = "10.1016/j.msea.2016.06.028",

language = "English",

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T1 - Determination of α/β phase boundaries and mechanical characterization of Mg-Sc binary alloys

AU - Ogawa, Yukiko

AU - Ando, Daisuke

AU - Sutou, Yuji

AU - Yoshimi, Kyosuke

AU - Koike, Junichi

N1 - Funding Information: This work was supported by KAKENHI ( 15H05549 ) and Tohoku University Division for International Advanced Research and Education ( DIARE ).

PY - 2016/7/18

Y1 - 2016/7/18

N2 - In this study, α(hcp)/β(bcc) phase boundaries of the Mg-Sc binary phase system were determined by Mg/Sc diffusion couple and conventional equilibrated alloy methods. It was confirmed that α/β phase boundaries exist in regions with a higher Mg content than those in reported diagram. The Mg-Sc alloy with a β single-phase showed tensile strength of 254 MPa and elongation of 25.4%. The tensile strength of the Mg-Sc alloy increased with increasing volume fraction of the α phase (fα) and the alloy with a fα of 34% showed high UTS of 310 MPa and elongation of 28.8%, properties which are better balanced than those of conventional Mg alloys. This improvement was suggested to be due to isotropic deformation of the β phase, small grain size and small c/a of the α phase.

AB - In this study, α(hcp)/β(bcc) phase boundaries of the Mg-Sc binary phase system were determined by Mg/Sc diffusion couple and conventional equilibrated alloy methods. It was confirmed that α/β phase boundaries exist in regions with a higher Mg content than those in reported diagram. The Mg-Sc alloy with a β single-phase showed tensile strength of 254 MPa and elongation of 25.4%. The tensile strength of the Mg-Sc alloy increased with increasing volume fraction of the α phase (fα) and the alloy with a fα of 34% showed high UTS of 310 MPa and elongation of 28.8%, properties which are better balanced than those of conventional Mg alloys. This improvement was suggested to be due to isotropic deformation of the β phase, small grain size and small c/a of the α phase.

KW - Magnesium alloys

KW - Mechanical characterization

KW - Phase diagram

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JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

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