Effect of High-Temperature Deformation in the Supercooled Liquid Region on the Service Performance of a Zr-Based Bulk Metallic Glass

The high-temperature deformation behavior of a Zr57Cu15.4Ni12.6Al10Nb5 bulk metallic glass (BMG) was studied by compression tests in the supercooled liquid region. Room temperature compression tests and microhardness tests were used to evaluate the effect of high-temperature deformation on room temperature service performance of the Zr-based BMG. The results show that the optimum processing parameters of the Zr-based BMG are 451 ±\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\pm$$\end{document} 5 °C and the strain rates range from 0.001 to 0.01 s−1. All the room temperature plastic deformation ratios of the Zr-based BMGs that have undergone high-temperature deformation at 451 °C increase with increasing strain rate and exceeds 5.5%, which is higher than that of ordinary as-cast Zr-based BMGs. Changes in the room-temperature service performance of the Zr-based BMG are attributed to the combined action of heat and force during high-temperature deformation in the supercooled liquid region. For Zr-based BMGs, a higher strain rate during high-temperature deformation is helpful to improve the room-temperature service performance under the premise of ensuring plastic formability.