Mechanical stability of Ca65Mg15Zn20 bulk metallic glass during deformation in the supercooled liquid region |
| |
Authors: | KJ Laws B Gun M Ferry |
| |
Affiliation: | aARC Centre of Excellence for Design in Light Metals & School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia |
| |
Abstract: | Ca65Mg15Zn20 bulk metallic glass (BMG) samples of dimensions 3.2 mm × 7 mm × 125 mm were prepared using a low-pressure die casting technique. These samples were ground to produce tensile test pieces in compliance with ASTM E8-04. This work is the first reported study of the tensile behaviour of Ca65Mg15Zn20 BMG in the supercooled liquid region (105–120 °C). Two deformation conditions were used for testing: (i) constant strain rate testing from 10?3 to 10?4 s?1 and (ii) constant load testing using loads of 20–50 N applied to a tensile sample during heating at a constant rate of 5 °C s?1. The maximum elongation to failure in the BMG was in excess of 850% for constant load testing although, under isothermal testing conditions, most samples failed after 200% elongation. It is concluded that large superplastic elongations (>500%) during isothermal tensile straining is difficult in this alloy due to the onset of crystallization. |
| |
Keywords: | Bulk metallic glass Mechanical behaviour Tensile testing Crystallization |
本文献已被 ScienceDirect 等数据库收录! |