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Microstructure and Mechanical Properties of Heat-resistant Mg-Zn-Y Cast Alloys with Addition of Fourth Elements

Article of Honda R&D Technical Review Vol.22 No.2


Extruded Mg-Zn-Y alloys with long-period stacking ordered (LPSO) structures are known to display increased strength at high temperatures, and are therefore useful in achieving weight savings in automotive components. Seeking to realize these attractive properties in cast components, the project discussed in this paper focused on controlling the microstructure of Mg96Zn2Y2 (at.%) cast alloy by the addition of a fourth element. First, the effects of refining the crystal grains through the addition of zirconium and modification of the cooling rate on microstructure and mechanical properties were investigated. With the addition of Zr and the achievement of a high rate of cooling, the resulting Mg95.8Zn2Y2Zr0.2 cast alloy displayed fine equiaxed grains (approx.10 mm in diameter) and excellent tensile and fatigue properties, equivalent to or greater than those of commercial aluminum alloys at high temperatures above 200 deg C. At 250 deg C, this alloy exhibited a tensile strength of 223 MPa, approximately twice that of the A4032-T6 alloy used for automotive pistons. The project also focused on strengthening LPSO structures by means of stacking fault energy (SFE), and used a first principle calculation to select a further element for addition to the alloy. The addition of Ag increased yield strength by 60 percent.


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The first half of this paper is modified from the earlier paper published in the Journal of Japan Institute of Light Metals, Vol. 60, No. 6 (2010).

Author (organization or company)

Yuichi IENAGA(Fundamental Technology Research Center)、Kenshi INOUE(Fundamental Technology Research Center)、Mitsumoto KAWAI(Fundamental Technology Research Center)

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