Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 35, Issue 5, Pages 891-901Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.12.004
Keywords
Magnesium alloys; Electron beam treatment; Corrosion resistance; Microstructure; Rapid re-solidification; Wear resistance
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018R1A2B3007806, 2017R1A5A1015311]
- Development of High Power Density Electron Beam Micro-drilling Machine and Process for High Aspect-ratio Micro-hole Parts - Ministry of Trade, Industry and Energy [10063367]
- National Research Foundation of Korea [2017R1A5A1015311, 2018R1A2B3007806] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Large pulsed electron beam (LPEB) irradiation was employed as a surface treatment of magnesium (Mg) alloy AZ31B to enhance its corrosion and wear resistance. Selective evaporation of Mg induced by LPEB irradiation at an energy density of 5 J/cm(2) for 40 cycles has led to the formation of an Al-enriched resolidified layer with nano-grained structure consisting of Mg3.1Al0.9 metastable phase. The formation of such a re-solidified layer after LPEB irradiation has enabled a decrease in corrosion rate of Mg alloy AZ31B in 3.5% NaCl solution. Different equivalent electrical circuit models were proposed to account for the corrosion behavior of untreated Mg alloy AZ31B and those subjected to LPEB irradiation. A decrease in wear depth when compared to that of the untreated alloy suggests an increase in wear resistance of LPEB-irradiated Mg alloy AZ31B. Adhesive wear is the predominant mechanism of untreated Mg alloy AZ31B while abrasive wear mechanism dominates for LPEB-irradiated Mg alloy AZ31B. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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