Effect of LPSO Phase-Stimulated Texture Evolution on Creep Resistance of Extruded Mg–Zn–Gd Alloys

• Jono Yuri

  Department of Materials Science, Kumamoto University

• Yamasaki Michiaki

  Department of Materials Science, Kumamoto University Magnesium Research Center, Kumamoto University

• Kawamura Yoshihito

  Department of Materials Science, Kumamoto University Magnesium Research Center, Kumamoto University

書誌事項

タイトル別名

• Effect of LPSO Phase-Stimulated Texture Evolution on Creep Resistance of Extruded Mg–Zn–Gd Alloys

抄録

The creep behavior and microstructures of extruded Mg₉₇Zn₁Gd₂ alloys with long period stacking ordered (LPSO) phase have been investigated. Creep properties of extruded alloys depend on pre-extrusion aging temperature; the optimum aging temperature to obtain excellent creep resistance is between 623 and 723 K. In this temperature range, a multimodal microstructure develops during subsequent extrusion at 623 K. The α-Mg matrix are bimodally grained; that is, it consists of fine DRXed grains and <10\bar{1}0>//ED fiber-textured coarse grains. The LPSO phase grains also develop the <10\bar{1}0>//ED fiber texture. Coarse block-shaped LPSO phase promotes dynamic recrystallization in α-Mg matrix via particle stimulated nucleation, while both fine plate-shaped LPSO phase and solute-segregated stacking faults (SFs) stimulate <10\bar{1}0>//ED fiber texture evolution in the α-Mg matrix. The creep strength increases with increasing area fraction of the <10\bar{1}0>//ED fiber textured region (coarse α-Mg grains and LPSO phase grains). Formation of plate-shaped LPSO phase and/or solute-segregated SFs before extrusion is most desirable for enhancing the creep properties of extruded Mg₉₇Zn₁Gd₂ alloys, due to LPSO phase-stimulated texture evolution.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 54 (5), 703-712, 2013

  公益社団法人 日本金属学会

キーワード

• magnesium
• magnesium–zinc–gadolinium
• long period stacking ordered phase
• texture
• dynamic recrystallization
• creep

詳細情報

• CRID: 1390282679228086400
• NII論文ID: 10031168414
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mi201218
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 024456566
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024456566
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/54/5/54_MI201218/_pdf
• 本文言語コード: en
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