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| Thickness effect on microstructural and mechanical properties of pulse-laser treated Ti/Ni multilayer thin films |
| Thickness effect on microstructural and mechanical properties of pulse-laser treated Ti/Ni multilayer thin films |
| Received:July 21, 2017 Revised:September 01, 2017 |
| DOI：10.7520/1001-4888-17-311 |
| 中文关键词: Ti/Ni multilayer laser treatment thickness effect hardness pulse-energy |
| 英文关键词:Ti/Ni multilayer laser treatment thickness effect hardness pulse-energy |
| 基金项目: |
| Author Name | Affiliation | | Zhou Yang | Department of Mechanical Engineering, University of Washington, Box 352600 Seattle, WA 98195, USA | | Melicent Stossel | Department of Mechanical Engineering, University of Washington, Box 352600 Seattle, WA 98195, USA | | Junlan Wang* | Department of Mechanical Engineering, University of Washington, Box 352600 Seattle, WA 98195, USA |
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| 中文摘要: |
| Previous work showed that pulse-laser irradiation can strengthen metal multilayer thin films through intermetallic formation and the degree of strengthening is a function of laser pulse energy. In this work, the effect of individual layer thickness (λ) and total multilayer thickness (h) on the resulting microstructure and mechanical strength of laser-treated Ti/Ni multilayers was further investigated. Experiments were carried out on four λ/h combinations using individual layer thickness of 20nm and 50nm, and total multilayer thickness of 500nm and 1μm, respectively. Obvious intermetallic strengthening was observed in the 500nm thick multilayers, especially with the 20nm layer thickness, but not in the 1μm thick multilayers. Further, the multilayer surface morphology after laser treatment was observed to be dominated by competition between laser-induced optical interference and thermal melting, with the former leading to ripple or cross-hatched patterns and the latter leading to melted surfaces with pores and cracks. |
| 英文摘要: |
| Previous work showed that pulse-laser irradiation can strengthen metal multilayer thin films through intermetallic formation and the degree of strengthening is a function of laser pulse energy. In this work, the effect of individual layer thickness (λ) and total multilayer thickness (h) on the resulting microstructure and mechanical strength of laser-treated Ti/Ni multilayers was further investigated. Experiments were carried out on four λ/h combinations using individual layer thickness of 20nm and 50nm, and total multilayer thickness of 500nm and 1μm, respectively. Obvious intermetallic strengthening was observed in the 500nm thick multilayers, especially with the 20nm layer thickness, but not in the 1μm thick multilayers. Further, the multilayer surface morphology after laser treatment was observed to be dominated by competition between laser-induced optical interference and thermal melting, with the former leading to ripple or cross-hatched patterns and the latter leading to melted surfaces with pores and cracks. |
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