Abstract: The effects of repetitive melting on the glass forming ability (GFA) of Zr60Al15Ni25 and Zr65Al7.5Ni10Cu17.5 were investigated. The results of DSC curves indicate that the glass transition temperature and the crystallization onset temperature of Zr60Al15Ni25 alloy increase as melting times increase. However, the characteristic temperatures of Zr65Al7.5Ni10Cu17.5 alloy scarcely change after repetitive melting. The reducing of fusion enthalpy of Zr60Al15Ni25 alloy after repetitive melting contributes to the suppressing of the nucleation of the primary phase. The improvement of the GFA of Zr60Al15Ni25 alloy is attributed to the smaller size of short-range orders, inheriting from the solidification structure of the ingot, after repetitive melting. Based on the fact that the attraction interaction of different species atoms controls the size of short-range orders in the liquid, the different sensitivity of the two alloys to repetitive melting was discussed.
Effect of repetitive melting on glass forming ability of Zr-based alloys
Abstract:
The effects of repetitive melting on the glass forming ability (GFA) of Zr 60Al 15Ni 25 and Zr 65Al 7.5Ni 10Cu 17.5 were investigated. The results of DSC curves indicate that the glass transition temperature and the crystallization onset temperature of Zr 60Al 15Ni 25 alloy increase as melting times increase. However, the characteristic temperatures of Zr 65Al 7.5Ni 10Cu 17.5 alloy scarcely change after repetitive melting. The reducing of fusion enthalpy of Zr 60Al 15Ni 25 alloy after repetitive melting contributes to the suppressing of the nucleation of the primary phase. The improvement of the GFA of Zr 60Al 15Ni 25 alloy is attributed to the smaller size of short-range orders, inheriting from the solidification structure of the ingot, after repetitive melting. Based on the fact that the attraction interaction of different species atoms controls the size of short-range orders in the liquid, the different sensitivity of the two alloys to repetitive melting was discussed.