Role of rare-earth elements in glass formation of Al-Ca-Ni amorphous alloys

► Effects of rare-earth elements on the glass forming-ability of Al-Ca-Ni system were investigated. ► The optimum doping content of all the four rare-earth elements was found to be 1%. ► Ytterbium is the most effective in improving the glass forming-ability of Al-Ca-Ni system. ► Atomic size difference between the rare-earth elements and Ca is the key factor in enhancing GFA.