A new composition zone of bulk metallic glass formation in the Cu-Zr-Ti ternary system and its correlation with the eutectic reaction |
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| Authors: | Chun-Li Dai Yi Li |
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| Institution: | a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
b Department of Materials Science and Engineering, National University of Singapore, Engineering Drive 1, Singapore 117675, Singapore |
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| Abstract: | A new composition region of bulk metallic glass formation, around Cu52Zr40Ti8, was discovered in the Cu-Zr-Ti ternary system, for which monolithic bulk metallic glass rods of 4 mm in diameter can be fabricated using copper mold casting. The solidification of the Cu52Zr40Ti8 deeply-undercooled liquid mainly undergoes a univariant eutectic reaction, (L → Cu10Zr7 + CuZr), even though this composition was predicted to be a ternary eutectic point (L → Cu10Zr7 + CuZr + Cu2ZrTi) by CALPHAD calculations. With respect to the deep-eutectic reaction of (L → Cu10Zr7 + CuZr) in the Cu-Zr binary alloys, alloying of Ti has a significant effect on further stabilizing the liquid, as indicated as a drop of the univariant eutectic groove, limiting the coupled growth of two crystalline phases, hence increasing the glass-forming ability. |
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| Keywords: | 61 43 Dq 61 25 Mv 64 70 pe |
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