Effect of Ca addition on selective oxidation of Al3Mg2 phase in Al-5 mass% Mg alloy

Bong Hwan Kim, Seong Ho Ha, Young Ok Yoon, Hyun Kyu Lim, Shae K. Kim, Do Hyang Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This study examined the effect of Ca addition on the selective oxidation of the Al3Mg2 phase in an Al-5 mass%Mg alloy during oxidation at 400 °C and 500 °C for 72 h. Ca addition led to the formation of the Al4Ca and Laves_C36 phases besides the primary Al solid solution and Al3Mg2. After the oxidation test, there was no significant oxidation in both the Ca-free and Ca-added alloy samples and no visible change in the surfaces between them at 400 °C, which is lower than the melting temperature of Al3Mg2 (451 °C). At 500 °C, the surface of the Ca-free alloy showed the formation of oxide blisters, which was not observed in the Ca-added alloy. The presence of an Al4Ca phase at the grain boundaries led to the formation of multi-element oxides containing Al, Mg, and Ca, which can contribute to the formation of a compact oxide layer.

Original languageEnglish
Pages (from-to)108-111
Number of pages4
JournalMaterials Letters
Volume228
DOIs
Publication statusPublished - 2018 Oct 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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