Ce-rich misch metal-based bulk metallic glasses with high glass-forming ability

作者：Li R; Pang SJ; Men H; Zhang T^*

来源：Materials Transactions, 2005, 46(10): 2291-2294.

DOI：10.2320/matertrans.46.2291

• bulk metallic glass
• misch metal
• rare earth metal
• glass-forming ability
• supercooled liquid region

Ce-rich misch metal (Mm)-based bulk metallic glasses (Mm consists of Ce, La, Pr and Nd) with high glass-forming ability are developed in Mm-Co-Al alloy system. The critical diameter for glass-formation is 10, 5 and 3 mm and the supercooled liquid region Delta(x)(T) (Delta T-x = T-x-T-g, T-x is crystallization temperature and T. is glass transition temperature) are 27, 90 and 79 K for Mm(65)Co(25)Al(10) (Mm(65)), Mm(60)Co(20)Al(20) (Mm60) and Mm(55)Co(25)Al(20) (Mm55) alloys, respectively. Reduced glass transition temperature T-rg (T-rg = T-g/T-m, where T-m is melting temperature) is 0.62, 0.65 and 0.69 for Mm65 Mm60 and Mm55 respectively. The employment of the misch metal, which comprises multi-rare earth elements, instead of pure Cc in the Ce-Al-Co system can improve the glass-forming ability in spite of the tiny atomic size difference of the rare earth metals. The present alloy system is an exception to the criteria of Delta T-x, T-g/T-m and different atomic size distribution as well as negative heat of mixing used for evaluating the relative GFA.

• 出版日期2005-10
• 单位北京航空航天大学