Role of icosahedral phase in enhancing the strength of Mg-Sn-Zn-Al alloy

D. H. Kim; Y. K. Kim; S. W. Sohn; Do H. Kim; W. T. Kim

doi:10.1016/j.jallcom.2012.09.050

Role of icosahedral phase in enhancing the strength of Mg-Sn-Zn-Al alloy

D. H. Kim, Y. K. Kim, S. W. Sohn, Do H. Kim, W. T. Kim

Department of Materials Science and Engineering

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

48 Citations (Scopus)

Abstract

The effect of the selection of the secondary solidification phase on the mechanical properties of the Mg-Sn-Zn and Mg-Sn-Zn-Al alloy rolled sheets has been investigated in the present study. The as-cast microstructure of Mg-7Sn-2Zn (in wt.%) alloy consists of α-Mg dendrite and interdendritic Mg ₂Sn and MgZn₂ phases, while that of Mg-7Sn-5Zn-2Al alloy consists of α-Mg dendrite and interdendritic Mg₂Sn and icosahedral (I-) phases. The micron scale interdendritic I-phase in the as-cast Mg-7Sn-5Zn-2Al alloy dissolves into the matrix during homogenizing treatment, and appears again in the α-Mg matrix as 0.1-0.5 μm size fine spherical precipitates after rolling process. As a result, the Mg-7Sn-5Zn-2Al alloy exhibits high yield strength of 318 MPa in as-rolled state. The high level of strength is attributed to the presence of finely distributed Mg₂Sn and I-phase particles embedded in the α-Mg matrix.

Original language	English
Pages (from-to)	46-50
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	549
DOIs	https://doi.org/10.1016/j.jallcom.2012.09.050
Publication status	Published - 2013 Feb 5

Bibliographical note

Funding Information:
This study was supported by the World Premier Materials (WPM) project funded by the Korea Ministry of Knowledge and Economy, and the Global Research Laboratory Program of Korea Ministry of Education, Science and Technology. Y.K. Kim is grateful for the support from the Third Stage of Brain Korea 21 Project in 2012.

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2012.09.050

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abstract = "The effect of the selection of the secondary solidification phase on the mechanical properties of the Mg-Sn-Zn and Mg-Sn-Zn-Al alloy rolled sheets has been investigated in the present study. The as-cast microstructure of Mg-7Sn-2Zn (in wt.%) alloy consists of α-Mg dendrite and interdendritic Mg 2Sn and MgZn2 phases, while that of Mg-7Sn-5Zn-2Al alloy consists of α-Mg dendrite and interdendritic Mg2Sn and icosahedral (I-) phases. The micron scale interdendritic I-phase in the as-cast Mg-7Sn-5Zn-2Al alloy dissolves into the matrix during homogenizing treatment, and appears again in the α-Mg matrix as 0.1-0.5 μm size fine spherical precipitates after rolling process. As a result, the Mg-7Sn-5Zn-2Al alloy exhibits high yield strength of 318 MPa in as-rolled state. The high level of strength is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in the α-Mg matrix.",

author = "Kim, {D. H.} and Kim, {Y. K.} and Sohn, {S. W.} and Kim, {Do H.} and Kim, {W. T.}",

note = "Funding Information: This study was supported by the World Premier Materials (WPM) project funded by the Korea Ministry of Knowledge and Economy, and the Global Research Laboratory Program of Korea Ministry of Education, Science and Technology. Y.K. Kim is grateful for the support from the Third Stage of Brain Korea 21 Project in 2012.",

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AU - Sohn, S. W.

AU - Kim, Do H.

AU - Kim, W. T.

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PY - 2013/2/5

Y1 - 2013/2/5

N2 - The effect of the selection of the secondary solidification phase on the mechanical properties of the Mg-Sn-Zn and Mg-Sn-Zn-Al alloy rolled sheets has been investigated in the present study. The as-cast microstructure of Mg-7Sn-2Zn (in wt.%) alloy consists of α-Mg dendrite and interdendritic Mg 2Sn and MgZn2 phases, while that of Mg-7Sn-5Zn-2Al alloy consists of α-Mg dendrite and interdendritic Mg2Sn and icosahedral (I-) phases. The micron scale interdendritic I-phase in the as-cast Mg-7Sn-5Zn-2Al alloy dissolves into the matrix during homogenizing treatment, and appears again in the α-Mg matrix as 0.1-0.5 μm size fine spherical precipitates after rolling process. As a result, the Mg-7Sn-5Zn-2Al alloy exhibits high yield strength of 318 MPa in as-rolled state. The high level of strength is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in the α-Mg matrix.

AB - The effect of the selection of the secondary solidification phase on the mechanical properties of the Mg-Sn-Zn and Mg-Sn-Zn-Al alloy rolled sheets has been investigated in the present study. The as-cast microstructure of Mg-7Sn-2Zn (in wt.%) alloy consists of α-Mg dendrite and interdendritic Mg 2Sn and MgZn2 phases, while that of Mg-7Sn-5Zn-2Al alloy consists of α-Mg dendrite and interdendritic Mg2Sn and icosahedral (I-) phases. The micron scale interdendritic I-phase in the as-cast Mg-7Sn-5Zn-2Al alloy dissolves into the matrix during homogenizing treatment, and appears again in the α-Mg matrix as 0.1-0.5 μm size fine spherical precipitates after rolling process. As a result, the Mg-7Sn-5Zn-2Al alloy exhibits high yield strength of 318 MPa in as-rolled state. The high level of strength is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in the α-Mg matrix.

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Role of icosahedral phase in enhancing the strength of Mg-Sn-Zn-Al alloy

Abstract

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