Creep and Corrosion Properties of the Extruded Magnesium Alloy Containing Rare Earth

• Jain Chao-Chi

  Department of Materials Science and Engineering, National Taiwan University

• Koo Chun-Hao

  Department of Materials Science and Engineering, National Taiwan University

Abstract

Effects of microstructures on the creep and corrosion properties were investigated in the Mg-8Al alloys with addition of the rare earth elements (La-rich Mischmetal, RE). The addition of RE to Mg-8Al alloy may form a stable intermetallic phase, Al₁₁RE₃ at elevated temperature, and suppress the β phase (Mg₁₇Al₁₂) with poor stability at high temperature. The corrosion rate of the alloy slightly decreases with increasing the added RE contents. The constant-load creep behavior was examined at 423, 448 and 473 K under stresses between 40 and 100 MPa. The RE-containing alloy showed a prolonged period of stead-state creep compared to the Mg-8Al base alloy and slightly reduced minimum creep rates. A stress exponent of 2 estimated suggests that the creep behavior can be controlled by the grain boundary sliding. The apparent activation energy for creep of Mg-8Al and Mg-8Al-2RE alloys are 114 and 104 kJ mol⁻¹, respectively.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 48 (2), 265-272, 2007

  The Japan Institute of Metals and Materials

Keywords

• magnesium-aluminum alloy
• microstructure
• creep property
• corrosion property

Details

• CRID: 1390282679227364608
• NII Article ID: 10018508983
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.48.265
• COI: 1:CAS:528:DC%2BD2sXjtlSru74%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 8623912
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8623912
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/48/2/48_MER2006199/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed