Grain boundary sliding as a significant mechanism of low temperature plastic deformation in ECAP aluminum

Nguyen Q. Chinh, György Vörös, Péter Szommer, Zenji Horita, Terence G. Langdon

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    19 被引用数 (Scopus)

    抄録

    Recently, the stress-strain relationships of high purity Al and Cu were investigated over a wide range of strain by combining data obtained in conventional tensile and compression testing of annealed samples with data obtained after processing by equal-channel angular pressing (ECAP) to high imposed strains. It was shown that the nature of the macroscopic stress-strain relationship characteristically changes in different regions of the testing temperature. In the low temperature region the macroscopic stress-strain behavior shows a monotonously increasing tendency over the entire range of strain inherent in these experiments, while at high testing temperatures the flow stress increases only up to a certain strain. It was also shown that in the positive strain-hardening region the stress-strain relationship can be described by an exponential-power law constitutive equation which includes the main features of the conventional Hollomon power-law and the Voce exponential relationships. On the basis of this new equation, low and high temperature deformation regions can be defined. In the present work, additional results are reported on the mechanism of steady-state flow of pure Al deformed at low temperatures. Results obtained by compression and indentation tests on ECAP Al samples, in addition to atomic force microscopy (AFM), show that in the low temperature region grain boundary sliding (GBS) is a significant mechanism of plastic deformation at high strains.

    本文言語英語
    ホスト出版物のタイトルNanomaterials by Severe Plastic Deformation, NanoSPD3 - Proceedings of the 3rd International Conference on Nanomaterials by Severe Plastics Deformation
    出版社Trans Tech Publications Ltd
    ページ1001-1006
    ページ数6
    ISBN(印刷版)0878499857, 9780878499854
    DOI
    出版ステータス出版済み - 1月 1 2006
    イベント3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3 - Fukuoka, 日本
    継続期間: 9月 22 20059月 26 2005

    出版物シリーズ

    名前Materials Science Forum
    503-504
    ISSN(印刷版)0255-5476

    その他

    その他3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3
    国/地域日本
    CityFukuoka
    Period9/22/059/26/05

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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