Evaluation of the Twinning Behavior of Polycrystalline Magnesium at Room Temperature by Acoustic Emission

• Li Yunping

  Department of Materials Engineering, School of Engineering, The University of Tokyo

• Enoki Manabu

  Department of Materials Engineering, School of Engineering, The University of Tokyo

抄録

In order to study the twinning behavior of polycrystalline magnesium at room temperature, acoustic emission (AE) was measured during the compression process at an intermediate strain rate along the extrusion direction. Microstructure evolution was quantitatively characterized by the twinning area fraction and the strain dependence of twinning size distribution from the observation by optical microscope. Deformation was mainly due to twinning nucleation in the initial stage, and twinning growth and dislocation motions gradually became dominant with the increase of strain. As AE count rate increased greatly in the initial stage of deformation and dropped quickly in the later stage, AE signals in the initial stage were thought to be mainly due to the twinning nucleation. Twinning strain and the fraction of twinning strain rate were calculated by considering the variation of Schmid factor in deformation. A quantitative relation between the twinning strain and the cumulative AE counts was obtained in the initial stage of deformation.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 48 (6), 1215-1220, 2007

  公益社団法人 日本金属学会

キーワード

• pure magnesium
• compression
• twinning size distribution
• twinning strain
• acoustic emission (AE)
• AE count rate

詳細情報

• CRID: 1390001204251171584
• NII論文ID: 10019486079
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.i-mra2007849
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 8742030
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8742030
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/48/6/48_I-MRA2007849/_pdf
• 本文言語コード: en
• データソース種別:
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