论文信息 - Solidification and Microstructure Control of Mg-rich Alloys in the Mg-Zn-Y Ternary Systemya

Solidification and Microstructure Control of Mg-rich Alloys in the Mg-Zn-Y Ternary Systemya

Solidification microstructures of Mg rich Mg-Zn-Y alloys were studied by using optical microscopy, scanning electron microscopy and transmission electron microscopy. Pseudo eutectic reaction (Liquid→α-Mg + icosahedral phase) takes place during solidification. Alloys containing high Mg content solidifies by primary crystallization ofα-Mg followed by the eutectic reaction at interdendritic region. Mg 68 Zn 28 Y 4 alloy solidifies by primary crystallization of I-phase followed by theeutectic reaction into a mixture of α-Mg and I-phase. Occasionally D-phase and Mg 4 Zn 7 phases were observed to form with orientation relationships with previously formed I-phase and D-phase, respectively. Thestrength of the alloys increased with increasing the volume fraction of I-phase.

[1] A. Tsai,et al. The Zn-Mg-Y phase diagram involving quasicrystals , 2000 .

[2] D. Sordelet,et al. Mechanical properties of Al-Cu-Fe-based quasicrystalline coatings , 1997 .

[3] W. Assmus,et al. Determination of the primary solidification area of the icosahedral phase in the ternary phase diagram of Zn-Mg-Y , 1997 .

[4] Zhiping Luo,et al. On the stable Mg-Zn-Y quasicrystals , 1996 .

[5] B. Cantor,et al. Structure and decomposition behaviour of rapidly solidified Al-Fe alloys , 1994 .

[6] W. Liu,et al. Mechanical properties of quasicrystalline and crystalline phases in AlCuFe alloys , 1993 .

[7] W. Boettinger,et al. The Al-Cu-Fe phase diagram: 0 to 25 At. pct Fe and 50 , 1992, Metallurgical and Materials Transactions A.

[8] F. Spaepen,et al. Stable Ga–Mg–Zn quasi-periodic crystals with pentagonal dodecahedral solidification morphology , 1987, Nature.

[9] A. Inoue,et al. A Stable Quasicrystal in Al-Cu-Fe System , 1987 .