Investigation of critical processing parameters for laser surface processing of AZ31B-H24
| Autor: | James M. Fitz-Gerald, Michael A. Melia, David C. Florian, Bruce F. Briglia, Michael K. Purzycki, Fritz W. Steuer, John R. Scully |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy medicine.medical_treatment Alloy Intermetallic Analytical chemistry 02 engineering and technology engineering.material Fluence law.invention Corrosion law 0202 electrical engineering electronic engineering information engineering Materials Chemistry medicine Dissolution Excimer laser Metallurgy Surfaces and Interfaces General Chemistry Nanosecond 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Surfaces Coatings and Films engineering 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 325:157-165 |
| ISSN: | 0257-8972 |
| Popis: | The abundance of electrochemically noble secondary phases present in the heterogeneous microstructure of Mg alloys leads to accelerated corrosion of the surrounding Mg matrix by micro-galvanic coupling. The extent of disintegration of the large Al-Mn intermetallic particles (IMPs) present in the Mg alloy AZ31B was investigated with respect to laser processing parameters of a nanosecond pulsed Excimer laser. The parameters investigated were overall pulse per area, laser fluence (J/cm2), and background pressure of Ar gas. Observation of resulting IMP dissolution, morphology, and subsequent reduction in cathodic corrosion kinetics are reported. Laser fluence and pulse per area were observed to have the largest impact on the corrosion kinetics and overall dissolution of IMPs, with the highest fluence (1.5 J/cm2) and 100 or above pulse per area exhibiting an order of magnitude reduction in cathodic kinetics. |
| Databáze: | OpenAIRE |
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