High-Temperature Rheological Behavior and Composition Design of Hf-Be-Ti-Zr-Cu-Ni High-Entropy Amorphous Alloy

The glass forming ability, thermal stability and high-temperature rheological behavior of the Hf-Be-Ti-Zr-Cu-Ni high-entropy alloy were studied. The results show that the appropriate Cu/Ni ratio significantly increases the glass forming ability and thermal stability of Hf based high-entropy alloy. When the Cu/Ni ratio is 0.21, the critical size increases from 10 to 18 mm, the supercooled liquid region is 61.15 K. The high-temperature rheological behavior of Hf30Be18Ti16Zr16Cu3.5Ni16.5 amorphous alloy is highly sensitive to strain rate and temperature. And with the decrease of strain rate, the structure of Hf-Be-Ti-Zr-Cu-Ni amorphous alloy changes more obviously at higher temperature, the thermal processing diagram is established, and the results show that the Hf30Be18Ti16Zr16Cu3.5Ni16.5 has good thermoplastic formability at 663-693 K, the strain rate: 5 x 10(-1) s(-1)-1 x 10(-3) s(-1).

Automated summary

The glass forming ability, thermal stability, and high-temperature rheological behavior of the Hf-Be-Ti-Zr-Cu-Ni high-entropy alloy were studied. The results showed that the appropriate Cu/Ni ratio significantly improved the glass forming ability and thermal stability of the alloy. Additionally, the alloy's high-temperature rheological behavior was highly sensitive to strain rate and temperature.