An Analysis of High Temperature Creep in Alpha Iron Based on the Super Jog Mechanism

• Watanabe Tadao

  Department of Materials Science, Faculty of Engineering, Tohoku University

• Karashima Seiichi

  Department of Materials Science, Faculty of Engineering, Tohoku University

抄録

Activation energies for high temperature creep determined under constant normalized stress, σ_c⁄E_T, agreed with activation energies for self-diffusion both in paramagnetic and ferromagnetic temperature regions of alpha iron. Activation volumes for creep deformation determined by stress relaxation tests during creep ranged from 5×10² b³ to 1.4×10³ b³. An analysis of the obtained results suggests that creep deformation of alpha iron is determined by the diffusion-controlled motion of screw dislocations which contain super-jogs. The height of the jogs was estimated at about 10b to 20b under different creep conditions. The super-jogs are supposed to be formed by the accumulation of elementary jogs produced on dislocations when the dislocations are pulled out from sub-boundaries. The dislocation densities and their stress dependence obtained on the basis of the motion of super-jogs were in good agreement with the results reported so far.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 11 (3), 159-165, 1970

  社団法人 日本金属学会

キーワード

• General Engineering

詳細情報

• CRID: 1390282680094154112
• NII論文ID: 130003485026
• DOI: 10.2320/matertrans1960.11.159
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/11/3/11_3_159/_pdf
• 本文言語コード: en
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