液体窒素温度および室温で引張変形した⟨111⟩アルミニウム単結晶の変形組織と再結晶

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書誌事項

タイトル別名
  • Deformation Structure and Recrystallization in ⟨111⟩ Aluminum Single Crystals Deformed in Tension at Liquid Nitrogen- and Room-Temperatures
  • 液体窒素温度および室温で引張変形した<111>アルミニウム単結晶の変形組織と再結晶
  • エキタイ チッソ オンド オヨビ シツオン デ ヒッパリ ヘンケイ シタ 111 アルミニウムタンケッショウ ノ ヘンケイ ソシキ ト サイケッショウ
  • Deformation Structure and Recrystallization in &lang;111&rang; Aluminum Single Crystals Deformed in Tension at Liquid Nitrogen- and Room-Temperatures

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99.99 mass% ⟨111⟩ aluminum single crystal specimens were deformed in tension to strains of about 20% at room- and liquid nitrogen(LN)-temperatures. Both specimens were annealed simultaneously at 773 K in an electric furnace until recrystallized grains were formed. At the same strain of 20% the flow stresses in the LN temperature and room temperature specimen were 238 MPa and 80 MPa, respectively. Its reason is due to the temperature dependence of cross slip. In neither specimen no deformation band was observed. The maximum misorientation among the cells measured by Electron Channelling Pattern(ECP) in the regions of the whole parallel-part of both specimens was only within 5°. The formation of recrystallized grains in ⟨111⟩ LN temperature specimen started earlier by 150 s at the same temperature of 773 K than that in ⟨111⟩ room temperature one. The rotation angles of the recrystallized grains to the orientation of the surrounding matrix about ⟨111⟩ axis normal to a common cross slip plane of the activated slip systems had approximately 15°∼50°. So these large rotation angles could not be explained from the “coalescence and rotation of cells” and “strain induced grain boundary migration” mechanisms. Probably the intersections of cell walls with very dense dislocation density (DDW), slip bands with heavy shear strain etc. would become nucleation sites of the recrystallized grains. Especially, the special intersections which have inverse rotation and large angle boundaries to the surrounding matrix should be chosen as the nucleation sites.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 65 (8), 672-679, 2001

    公益社団法人 日本金属学会

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