FORMATION OF La-Al-Ni-Cu-Fe BULK METALLIC GLASSES WITH HIGH GLASS-FORMING ABILITY

作者：Ji Yunfei^*; Pang Shujie; Ma Chaoli; Zhang Tao

来源：International Journal of Modern Physics B, 2010, 24(15-16): 2314-2319.

DOI：10.1142/S021797921006485X

• Bulk metallic glass
• Glass-forming ability
• Rare-earth metal

The effect of alloy composition on improving glass-forming ability of La-based alloys is investigated in this work. Previous composition criteria demonstrated that the alloys with high glass-forming ability should have negative heats of mixing among the main constituent elements. In this study, the addition of Fe to a La-based La-Al-Ni-Cu alloy significantly improved the glass-forming ability, although the heat of mixing between Fe and the main element La is positive. La-Al-Ni-Cu-Fe bulk metallic glasses with diameters up to 15 mm were prepared by the method of pouring the molten alloys into a copper mold. These La-Al-Ni-Cu-Fe bulk metallic glasses exhibit relatively wide supercooled liquid region of about 50 k, and high T(rg)(T(g)/T(l)) and Y(T(x)/(T(g)+T(l))) values. It is found that the addition of Fe to the La-Al-Ni-Cu alloy lowers the Gibbs free energy difference between the liquid and crystalline phases in the supercooled liquid region and enhances the glass-forming ability of the alloy.

• 出版日期2010-6-30
• 单位北京航空航天大学