The Effect of Al on the Mechanical Properties and Microstructure of Copper-based Metallic Glass. Issue 4 (2nd October 2017) - Chen, Tao-Hsing
Abstract: An investigation was carried out into the effect of different amounts of Al on the mechanical properties, and glass-forming ability, of a three component alloy (Cu–Zr–Al). The mechanical properties were studied using a universal materials tester and a Split-Hopkinson bar tester. A series of amorphous alloys with different Al content were subjected to static compression and dynamic high-speed impact tests at 10 −1 s −1, 10 −2 s −1, and 10 −3 s −1 for the static condition and 2000 s −1, 3000 s −1, and 4000 s −1 for the dynamic condition. Experiment showed that the flow stress value and the strain rate sensitivity coefficient of the copper-based amorphous alloys varied with changes of strain and strain rate. An increase in the rate of strain caused the flow stress value and the sensitivity coefficient of the strain rate to rise. When the Al content in an amorphous alloy Cu47.5 Zr45.5 Al7 was 7%, both the flow stress value and the strain were improved and effectively upgraded the mechanical properties of the material. Abstract : Relationship of the static stress–strain curves at different strain rates for (a) Cu51.5Zr45.5Al3 and (b) Cu47.5Zr45.5Al7.