A novel surface technique, ultrasonic nano-crystal surface modification (UNSM), was used to process BMGs (Bulk Metallic Glasses) to improve the fracture strength and strain. It has been found that the fracture strength and strain are increased by 14.6% and 15.3% respectively after UNSM. In addition, micro-defects (voids and cracks) are found at the surface layer of UNSM-treated specimen after fracture, while there are fewer micro-defects observed in the untreated sample. We attribute the improvement of fracture stress and strain to two mechanisms. First, the excess free volume generated in BMGs by UNSM helps the nucleation of shear bands and the redistribution of the localized deformation. Second, the compressive residual stress generate by UNSM can slow down crack propagation. Both mechanisms lead to the improvement of BMGs fracture strength and strain.
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ASME 2016 11th International Manufacturing Science and Engineering Conference
June 27–July 1, 2016
Blacksburg, Virginia, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-4990-3
PROCEEDINGS PAPER
Increasing the Fracture Strength and Strain of Bulk Metallic Glasses by Ultrasonic Nano-Crystal Surface Modification Available to Purchase
Chang Ye
Chang Ye
The University of Akron, Akron, OH
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Chi Ma
The University of Akron, Akron, OH
Yalin Dong
The University of Akron, Akron, OH
Chang Ye
The University of Akron, Akron, OH
Paper No:
MSEC2016-8703, V002T01A007; 6 pages
Published Online:
September 27, 2016
Citation
Ma, C, Dong, Y, & Ye, C. "Increasing the Fracture Strength and Strain of Bulk Metallic Glasses by Ultrasonic Nano-Crystal Surface Modification." Proceedings of the ASME 2016 11th International Manufacturing Science and Engineering Conference. Volume 2: Materials; Biomanufacturing; Properties, Applications and Systems; Sustainable Manufacturing. Blacksburg, Virginia, USA. June 27–July 1, 2016. V002T01A007. ASME. https://doi.org/10.1115/MSEC2016-8703
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