Ｍｇ‐Ａｌ系合金のクリープ変形挙動のθ法による評価

• 内田 博幸

  (株)神戸製鋼所材料研究所

• 新谷 智彦

  (株)神戸製鋼所材料研究所

書誌事項

タイトル別名

• Estimation of creep deformation behavior in Mg-Al alloys by using .THETA. projection method.
• Mg Alケイ ゴウキン ノ クリープ ヘンケイ キョドウ ノ シータホウ ニ

抄録

The creep deformation behavior of magnesium and Mg-Al alloys was analyzed by using the θ projection concept based on the following equation:<br>ε=θ₁{1-exp(-θ₂t)}+θ₃{exp(θ₄t)^-1}<br>where ε is creep strain, t time and θ₁-θ₄ the parameters determined by curve fitting. The equation was able to reproduce the creep curves even in the tertiary creep stage. In solid solution hardened alloys containing up to 6 mass% Al parameters θ₁ and θ₃ were independent of temperature, but temperature dependent in the precipitation hardened alloy containing 9 mass%Al. The activation energy for θ₁ and θ₃ in Mg-9 mass%Al alloy was 30kJ/mol, and this value was equal to that of discontinuous grain boundary precipitation of Mg₁₇Al₁₂ during aging. The activation energy for θ₂ related to strain hardening rate was 100kJ/mol, and that for θ₄ related to recovery or weakening rate was 134kJ/mol. The activation energy of θ₄ was almost same as that of self-diffusion in pure Mg, indicating that the recovery or weakening rate is controlled by climbing of dislocations.

収録刊行物

• 軽金属

  軽金属 45 (10), 572-577, 1995

  一般社団法人 軽金属学会

キーワード

• Mg-Al alloys
• solid solution hardened alloy
• precipitation hardened alloy
• creep deformation
• θ projection concept

詳細情報

• CRID: 1390282681312677760
• NII論文ID: 10001725619
• NII論文ID: 10003904459
• NII書誌ID: AN00069773
• DOI: 10.2464/jilm.45.572
• ISSN: 18808018
• ISSN: 04515994
• NDL書誌ID: 3641750
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3641750
• 本文言語コード: ja
• データソース種別:
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