A quinary Ti–Zr–Hf–Be–Cu high entropy bulk metallic glass with a critical size of 12 mm

• Published in: Intermetallics Vol. 61; pp. 47 - 50
• Main Authors: Zhao, S.F., Yang, G.N., Ding, H.Y., Yao, K.F.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-06-2015
• Subjects: A. High–entropy alloys; A. Metallic glasses; Alloys; Amorphous materials; B. Glass forming ability; B. Mechanical properties; B. Thermal properties; C. Casting; Copper base alloys; Entropy; Glass formation; Liquids; Metallic glasses; Molds; A. High–entropy alloys; A. Metallic glasses; C. Casting; B. Mechanical properties; B. Glass forming ability; B. Thermal properties
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2015.02.011

A quinary Ti20Zr20Hf20Be20Cu20 high entropy bulk metallic glass (HE-BMG), with a critical diameter (Dc) of 12 mm—the largest size in the reported quinary high entropy alloys (HEAs), has been successfully prepared by copper mold casing. This novel HE-BMG possesses a supercooled liquid region ΔT (=Tx − Tg) of 78 K, indicating a better thermal stability than those of other HE-BMGs. In addition, the HE-BMG exhibits a relatively good compressive plasticity (2.2 ± 0.1%) among the HE-BMGs. The newly developed HE-BMG may offer insights for the indepth understanding of the fundamental issues associated with the glass formation and the unique structure-property relationship when combining the features of HEAs and BMGs together.
•A new quinary high entropy bulk metallic glasses (HE-BMG) has been developed.•This HE-BMG has the largest critical size of 12 mm in the reported quinary HE-BMGs.•This HE-BMG possesses a larger supercooled liquid region of 78 K than other HE-BMGs.•This HE-BMG exhibits a relatively good plasticity (2.2 ± 0.1%) among the HE-BMGs.