ＡＺ３１マグネシウム合金の高温変形中における組織変化と機械的特性

• 野田 雅史

  ジェイアール総研エンジニアリング

• 船見 国男

  千葉工業大学工学部

• 清水 秀治

  千葉工業大学工学部

• 森 久史

  鉄道総合技術研究所

• 辻村 太郎

  鉄道総合技術研究所

書誌事項

タイトル別名

• Mechanical Properties and Microstructure of AZ31 Magnesium Alloy during High Temperature Deformation
• AZ31 マグネシウム ゴウキン ノ コウオン ヘンケイチュウ ニ オケル ソシキ ヘンカ ト キカイテキ トクセイ

抄録

  In this study, uniaxial and biaxial deformations were applied to a magnesium alloy of AZ31 to reproduce the stresses that occur during product processing and to compare the mechanical properties and microstructure of the alloy after being deformed at each load stress.<br>    We conducted a high-temperature tensile test on uniaxial and biaxial deformations in the range of initial strain rate of 2.7×10^-4 to 2.7×10^-1 s^-1. The uniaxially deformed alloy achieved a fracture elongation of 230% at an initial strain rate of 2.7×10^-4 s^-1 and also about 100% at that of 2.7×10^-1 s^-1. On the other hands, the biaxially deformed alloy indicated higher values of yield stress and tensile strength, 45 MPa and 62 MPa at maximum, respectively, than the uniaxially deformed one, but a fracture elongation of only about 30%. The cross section of the uniaxially deformed alloy was significantly reduced due to the distortion of its sheet thickness and width, while the biaxial deformation was restricted due to the application of a vertical and bi-directional principal stress. For this reason, the biaxial deformed alloy received a higher average stress than the uniaxially deformed one, so it ruptured without huge elongation.<br>    Although the biaxially deformed alloy suffered less deformation under rupture than the uniaxially deformed alloy, microvoids with a length of about 1 μm that could not be observed after the uniaxial deformation were found in grain boundaries where a fibrous structure could be seen. The formation of this fibrous structure caused local stress and nonuniform strain during deformation, so the grains became corrugated and smaller at a strain rate of 2.7×10^-4 s^-1 and fine grain of about 2 μm were formed among coarse grains.<br>

収録刊行物

• 日本金属学会誌

  日本金属学会誌 71 (9), 678-683, 2007

  公益社団法人 日本金属学会

キーワード

• magnesium alloy
• biaxial tensile test
• duplex structures
• intragranular deformation
• mechanical properties

詳細情報

• CRID: 1390001206477252736
• NII論文ID: 10019854604
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet.71.678
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 8942086
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8942086
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/71/9/71_9_678/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可