On crystallization behavior and thermal stability of Cu64Zr36 metallic glass by controlling the melt temperature

Abstract

Change in melt structure of Cu64Zr36 binary metallic glass (MG) was studied using resistivity and differential thermal analysis in continuous heating process, abnormal structural changes were observed with temperature elevating. Cu64Zr36 MG ribbons with different melt temperatures were prepared using single roller spinning method, experimental results based on resistivity, DSC, and XRD indicate that the thermal stability and glass forming ability (GFA) of Cu64Zr36 MGs are greatly affected by the melt temperature. With the increasing of the melt temperature, the crystallization temperature (Tx) and supercooled liquid region (ΔTx) shift from 780.7K and 41.9K of the MG with the lowest melt temperature of 1353K towards to 800.3K and 48.1K of the MG with the highest melt temperature of 1653K. The relationship of the melt temperature and GFA was further studied by injecting the melt into a cone-shape copper mould. The critical diameter can reach Ф2.5mm of the Cu64Zr36 MG with the highest melt temperature of 1653K. However, the Ф2.5 cross section of Cu64Zr36 MGs prepared with the melt temperature lower than 1653K shows apparent Bragg peaks.