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Softening and hardening on a Zr-based bulk metallic glass induced by nanosecond laser surface melting

Jiao, Yang, Brousseau, Emmanuel, Kosai, Koji, Lunt, Alexander J.G., Yan, Jiwang, Han, Quanquan, Zhu, Hanxing, Bigot, Samuel and He, Weifeng 2020. Softening and hardening on a Zr-based bulk metallic glass induced by nanosecond laser surface melting. Materials Science and Engineering: A , 140497. 10.1016/j.msea.2020.140497
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Abstract

The study reported here confirms that laser surface melting (LSM) can be employed to modify the hardness and the shear banding behaviour of bulk metallic glasses (BMGs). More specifically, by conducting LSM operations on the Zr-based Vitreloy 105 BMG in ambient atmosphere using a nanosecond laser, it was found that surface hardening can be achieved, in addition to the well-known surface softening effect. Besides, it was found that the presence of compressive residual stress and an increased introduction of crystalline precipitates accompanied LSM-induced surface hardening. On the contrary, tensile residual stress and a reduced fraction of crystalline precipitates were observed for a softened surface post-LSM. Finally, differences in shear-banding mechanisms were detected near the surface of the laser irradiated regions. More specifically, overall reduced serrated flow but important surface shear bands events were observed following the LSM-based introduction of compressive residual stress. In contrast, more pronounced serrated flows and the likely distribution of shear banding activity well beneath the irradiated BMG surface was promoted when LSM resulted in the introduction of tensile residual stress.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Engineering
Publisher: Elsevier
ISSN: 0921-5093
Date of First Compliant Deposit: 9 November 2020
Date of Acceptance: 6 November 2020
Last Modified: 27 Nov 2020 06:01
URI: http://orca.cf.ac.uk/id/eprint/136221

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