温間強圧延された5182アルミニウム合金における超微細結晶粒の形成

• 辻 伸泰

  大阪大学大学院工学研究科マテリアル科学専攻

• 村上 武

  大阪大学大学院工学研究科マテリアル科学専攻

• 齋藤 好弘

  大阪大学大学院工学研究科マテリアル科学専攻

書誌事項

タイトル別名

• Formation of Ultra-Fine Grains in 5182 Aluminum Alloy Heavily Rolled at Warm Temperatures
• オン カン キョウアツ ノバサレタ 5182 アルミニウム ゴウキン ニ オケル チョウビサイ ケッショウリュウ ノ ケイセイ

抄録

In order to obtain the ultra-fine grained bulk materials whose grain size is less than 1 μm, 5182 aluminum alloy was heavily rolled up to 98.3% at elevated temperatures (R.T.-573 K). The strength of the rolled specimens increased with increasing strain and decreasing rolling temperature, and the tensile strength of the specimen 98.3% rolled at R.T. reached to 540 MPa. The elongation of the 98.3% rolled specimens was 6 to 8% independent of the rolling temperature. No ultra-fine grains were observed in the as-rolled specimens. The specimens 98.3% rolled below 473 K showed complicated deformation microstructures and large local misorientations, while the 573 K rolled specimen showed an ordinary cell structure with small misorientation. Although ultra-fine grains did not form in the as-rolled specimens, 473 K annealing produced the ultra-fine grained structure in the specimens 98.3% rolled below 473 K. The mean grain size of the ultra-fine grains was about 600 nm, independent of the rolling temperature. Ultra-fine grains were not formed in the specimen rolled at 573 K. Even after annealing at 473 K for 18 ks, the ultra-fine grains were not coarsened and the sub-micrometer grain size remained. The formation of the ultra-fine grains can be explained by growth-inhibited recrystallization-nucleation, owing to both the homogeneous introduction of a number of potential nuclei with large local misorientations by high straining and the limited diffusion during low temperature annealing. Ultra-fine grained materials annealed at 473 K showed a tensile strength of 380 MPa and an elongation of 20%. The large strength of the ultra-fine grained material is due to grain refinement, because the Hall-Petch relation between the Vickers hardness and the grain size of the materials was observed.

収録刊行物

• 日本金属学会誌

  日本金属学会誌 63 (2), 243-251, 1999

  公益社団法人 日本金属学会

キーワード

• high straining
• heavy warm-rolling
• low temperature annealing
• 5182 aluminum alloy
• ultra-fine grain
• high strength
• recrystallization
• deformation microstructure
• diffusion
• Hall-Petch relation

詳細情報

• CRID: 1390001206490685184
• NII論文ID: 130007341305
• NII論文ID: 10002548949
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet1952.63.2_243
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• ISSN: http://id.crossref.org/issn/00214876
• NDL書誌ID: 4659692
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4659692
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet1952/63/2/63_2_243/_pdf
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可