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Surface Enrichment of Mg and Ca in Cu–Mg Alloy Containing a Trace Amount of Ca and Its Effects on Oxidation Resistance

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In this study, the surface segregation of Mg and Ca in Cu–Mg alloys containing a trace amount of Ca under an oxidative atmosphere and its effects on oxidation resistance were examined. The use of a Mg+Mg2Ca master alloy as an alloying element for Mg rendered significant surface protection during melting and casting. During solid-state oxidation, the oxidation resistance was increased by the addition of Mg. Ca containing alloys with the same Mg exhibited a relatively higher oxidation resistance. From the phase diagram with the oxygen partial pressure as a function of the Mg content, the Ca containing alloy led to the formation of CaO as the primary oxide. The improved oxidation resistance of Ca containing alloys can be attributed to a mixed surface layer of CaO and MgO.
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Keywords: Ca; CaO; Cu–Mg System; MgO; Oxidation

Document Type: Research Article

Affiliations: 1: Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea 2: Extreme Fabrication Technology Group, Korea Institute of Industrial Technology, 320 Techno Sunhwan-ro, Yuga-myeon, Dalseong-gun, Daegu 42994, Korea

Publication date: March 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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