動的連続再結晶と超塑性発現に関する研究

动态连续再结晶与超塑性发展研究

• 批准号: 10122205
• 负责人: 酒井 拓
• 金额: $ 1.02万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas (A)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10122205/
• 关键词: 超塑性; 動的連続再結晶; 未再結晶組織; 粒界すべり; 結晶粒微細化; 7075アルミニウム合金; 冷間加工

適切な冷間-温間加工を施した7075AlI合金の高温変形中に微細粒組織の形成と超塑性が同時に起こる現象に関して,冷間圧延率を25,50,67%の3種類に変化させて高温変形特性に及ぼす圧延率の影響を系統的に調査した.動的連続再結晶に伴う細粒化過程と超塑性との関係並びに両者の発現機構について検討を加え,次の諸結果を得た.1. 冷間圧延率の増加は試験片内単位体積当たりの粒界密度を増加させること,偏平化した結晶粒の厚さ方向の粒径を減少させるために,高温変形に伴う微細粒の形成が促進されると共に超塑性特性を向上させた.2. 高温変形組織のTEM間によれば,引張方向に平行なパンケーキ状旧粒界での粒界すべりとそれに伴いサブグレンの回転が変形初期から頻繁に生じた.冷間圧延直後のほぼ直線状のなめらかな旧粒界は,高温加熱中に亜結晶粒の形成に伴い凹凸化した.3. この組織に高温変形を加えると,引張方向に対し傾斜した粒界部分で局部的に粒界すべりを起こして亜結晶粒間の方位差を増加させ,その周囲の亜晶粒界を高傾角化させる.その粒界上での粒界すべりとそれに伴い粒回転を起こす.それが隣接領域へ伝播し続け,その結果高ひずみで微細粒組織が生じると結論される.これが本合金における動的連続再結晶過程である.4. 冷間圧延で導入したパンケーキ状結晶粒界上での粒界すべりが活発な生起するため,微細粒の形成と動じに超塑性発現に対して粒界すべり大きな役割を果たすと結論される.

Suitable for cold-warm processing and high-temperature deformation of 7075AlI alloy to form and super-fine grain structure There are 3 types of plasticity and cold pressure elongation ratios of 25, 50, and 67%. Systematic investigation of the influence of high-temperature deformation characteristics and pressure elongation on dynamic continuous recrystallization accompanied by fine graining The process of superplasticity and the relationship between it and the existing mechanism are the same, and the results are obtained. 1. The increase of the cold pressure elongation rate and the unit volume in the test piece are the increase of the grain boundary density and the flattening direction of the thickness of the crystal grains. The particle size is reduced and the high-temperature deformation is accompanied by the formation of fine particles and the superplastic properties are improved. 2. The high-temperature deformation structure is between TEM and the tensile direction is parallel to the old grain boundary and the old grain boundary is in the same shape. In the early stage, the grains are frequently formed. After the cold pressure is straightened, the straight grain boundaries are formed, and the formation of crystal grains is accompanied by unevenness during high temperature heating. 3. The structure is high-temperature deformed, the tension direction is tilted, and the grain boundary part is partially raised. The azimuth difference between the crystal grains is increased, and the azimuth difference between the crystal grains is increased, and the grain boundary is increased to a high inclination angle.の片界すべりとそれに companion い草転を开こす.それがAdjacent area へ伝 Broadcast し続け, そのRESULT 高ひずみThe fine-grained structure is produced and the conclusion is drawn. The continuous recrystallization process of this alloy is carried out. 4. The cold pressure extension is introduced into the crystal grain boundary, and the grain boundary is generated. Fine grain formation and movement, superplasticity, grain boundary, large grain boundary, cutting, fruiting, and conclusion.

项目成果

X.Yang,H.Miura and T.Sakai: "Effect of Cold Pre-Rolling on Superplasticity of Nonre-crystallized 7075 Al Alloy" Mater.Sci.Forum. (印刷中). (1999)

X.Yang、H.Miura 和 T.Sakai：“冷预轧对未再结晶 7075 铝合金超塑性的影响”Mater.Sci.Forum（1999 年出版）。

W.-Y Kim,S.Hanada and T.Sakai: "Superplastic Deformation of Boron Doped Fe-18 at % Si" Materials Science and Engineering. A238. 78-86 (1998)

W.-Y％20Kim，S.Hanada％20和％20T.Sakai：％20“超塑性％20变形％20of％20硼％20掺杂％20Fe-18％20at％20％％20Si”％20材料％20科学％20和％20工程。

A.Belyakov,H.Miura and T.Sakai: "Dynamic Rycrystallization under Warm Deformation of Polyccrystalline Copper" ISIJ International. 38. 595-601 (1998)

A.Belyakov、H.Miura 和 T.Sakai：“多晶铜温变形下的动态晶化”ISIJ International。