Abstract
The formation of quasicrystals and related approximant crystalline phases is studied in the Mg-Al-Zn alloy system by applying mechanical alloying technique. This technique is advantageous over the conventional melt-spinning because of the ease in sample preparation involving only the solid-state reaction. The quasicrystal is formed over a wide composition range. Those formed along the Bergman line corresponding to Mg 39.5 , (Al 1-x Zn x ) 60.5 are found to be metastable and to transform into stable (1/1-1/1-1/1) Frank-Kasper phase by evolving an exothermic peak in the DSC run. Its stability is found to increase with decreasing Al content
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