MICROSTRUCTURE OF Mg-Zn-Zr-Y ALLOYS

Abstract

Abstract: In the as-cast Mg-Zn-Zr-Y alloys, the quasicrystal phases show massive and eutectoid plate morphologies. The selected area dijfraction(SAD) revealed that a large pan of the quasicrystals are face-centered icosahedral (FCI), while a small amout of the quasicrystals belong to the simple icosahedral (SI) phase. It was found that in homogenized alloys, a part of the grain boundry phases was dissolved,and small massive W-phase and lath-shape MgZn_(2) phase dispersedly precipitate in the grains. The transformation of the quasicrystals relates to the temperature. After homogenizing at 360 ℃ , the quasicrystals still present, while after homogenizing at 400 ℃ , the quasicrystals transformed into a new C-type orthorhombic phase witha = 0.975 nm, b = 1.137nm and=0.935 nm.

Key words: Mg-Zn-Zr-Y alloy, quasicrystal, phase structure

LUO Zhiping, ZHANG Shaoqing, SONG DeyuBeijing Institute of Aeronoutical Materials, Beijing, 100095, ChinaTANG Yali, ZHAO DongshanZhengzhou Institute of Technology, Zhengzhou, 450002, China Manuscript received, 27 April 1994. MICROSTRUCTURE OF Mg-Zn-Zr-Y ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1994, 7(2): 133-138.

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MICROSTRUCTURE OF Mg-Zn-Zr-Y ALLOYS

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