Effects of Sn addition on mechanical properties of Ti-based bulk metallic glass composites

• Published in: Materials & design Vol. 110; pp. 782 - 789
• Main Authors: Zhai, Haimin, Wang, Haifeng, Liu, Feng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15-11-2016
• Subjects: Amorphous materials; Bulk metallic glass composite; Matching; Mechanical properties; Metallic glasses; Minor addition of elements; Modulus of elasticity; Stress concentration; Stresses; Ti-based alloy; Tin (Sn); Titanium; Young's modulus; Ti-based alloy; Young's modulus; Tin (Sn); Minor addition of elements; Bulk metallic glass composite
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2016.08.051

Ti-based bulk metallic glass (BMG) composites were prepared by a minor addition of Sn to match the Young's modulus of dendrite-phase and glass-matrix, and prepared by suction casting into a water-cooled copper mold. The largest compressive fracture strain of 28.07% and the highest fracture strength of 1820MPa are obtained simultaneously in the Ti45Zr25Nb6Cu5Be17Sn2 BMG composite. The average stress concentration factor of dendrite-phase, which characterizes the concentrated stress in the dendrite-phase that is transferred to the glass-matrix through the interface, is found to be highly related to the mechanical properties and thus would be a guide for matching the Young's modulus. The microscopic deformation mechanism shows that the high average stress concentration factor of dendrite-phase promotes the transfer of concentrated stress from the dendrite-phase to the glass-matrix, thus leading to the formation of multiple shear bands. Matching the Young's modulus of dendrite-phase and glass-matrix is concluded to be a useful recipe to prepare the BMG composites with excellent mechanical properties.
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•Ti-based bulk metallic glass (BMG) composites were prepared by suction casting into a water-cooled copper mold.•BMG composite were prepared by a minor addition of Sn to match the Young's modulus of dendrite-phase and glass-matrix.•The average stress concentration factor of dendrite-phase is highly related to the mechanical properties.