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A thermal processing map of a ZrCuNiAlEr bulk metallic glass in the supercooled liquid region
- Li, Chunyan, Yin, Jinfeng, Ding, Juanqiang, Zhu, Fuping, Xu, Fei, Zhao, Yanchun, Kou, Shengzhong
- Journal of materials science 2019 v.54 no.9 pp. 7246-7255
- deformation, glass, heat treatment, liquids, temperature
- Thermal compression tests of (Zr₀.₆₃₃₆Cu₀.₁₄₅₂Ni₀.₁₀₁₂Al₀.₁₂)₉₇.₄Er₂.₆ bulk metallic glass (BMG) were performed at temperature of 410, 420, 430 and 440 °C and strain rates of 5 × 10⁻⁴, 10⁻³, 5 × 10⁻³ and 10⁻² s⁻¹, and a thermal processing map was constructed in the supercooled liquid region. The results indicate that in low strain rate regions (5 × 10⁻⁴–10⁻³ s⁻¹), the processing efficiency range is 70–85% and stress range is 70–120 MPa with temperatures of 410 and 420 °C, and the samples can be thermally processed under relatively small stress and show better fluidity, so temperatures of 410 and 420 °C and the strain rate range of 5 × 10⁻⁴–10⁻³ s⁻¹ are optional thermal processing parameters. When the temperature is 430 °C and the strain rate range is 5 × 10⁻⁴–10⁻² s⁻¹, the processing efficiency range is 75–85%, and the stress range is 16–106 MPa. The (Zr₀.₆₃₃₆Cu₀.₁₄₅₂Ni₀.₁₀₁₂Al₀.₁₂)₉₇.₄Er₂.₆ BMG can be thermoformed under smaller flow stress and shows excellent fluidity; therefore, 430 °C and 5 × 10⁻⁴–10⁻² s⁻¹ also are optional thermal processing parameters.