Effect of Plastic Strain Incompatibility on 0.1% Proof Stresses of Zinc Bicrystals

• Maruyama Kouichi

  Department of Materials Science, Faculty of Engineering, Tohoku University

• Akabori Mitsuo

  Graduate School, Tohoku University

• Karashima Seiichi

  Department of Materials Science, Faculty of Engineering, Tohoku University

抄録

Deformation behaviour of three kinds of isoaxial zinc bicrystals is described to make clear the effects of grain boundaries on plastic deformation. Secondary slip lines were observed near the grain boundary at an early stage of deformation in incompatible bicrystals, while they were not in compatible bicrystals. Most of secondary slip systems are activated to release the incompatibility developed in each crystal due to primary slips, and others are activated to cancel the bending moment which is caused by the shift of tensile axis due to primary slips.<BR>0.1% proof stress increased with an increase in the degree of incompatibility. Difference in the proof stress, (τ_B-τ_S), between bicrystal and single crystal was related to incompatibility strain, Δε, by (τ_B-τ_S)∝\sqrt|Δε|. This relationship is in quantitative agreement with the theoretical one derived from Ashby’s theory, if an appropriate value is used for a constant which relates the dislocation density to the flow stress. It is concluded that the increase in 0.1% proof stress is caused by multiple slips near the grain boundary induced to release the incompatibility.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 22 (10), 723-732, 1981

  社団法人 日本金属学会

キーワード

• General Engineering

詳細情報

• CRID: 1390282680095730304
• NII論文ID: 130003485867
• DOI: 10.2320/matertrans1960.22.723
• COI: 1:CAS:528:DyaL3MXmt12mtLY%3D
• ISSN: 24324701
• ISSN: 00214434
• ISSN: http://id.crossref.org/issn/00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/22/10/22_10_723/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
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