Sharpening of Cube Texture during Continuous Cyclic Bending Process in Aluminum-Magnesium base alloy

铝镁基合金连续循环弯曲过程中立方织构的锐化

• 批准号: 12650691
• 负责人: TAKAYAMA Yoshimasa
• 金额: $ 2.24万
• 依托单位: UTSUNOMIYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650691/
• 关键词: Aluminum alloy; Continuous cyclic bending; Cube texture; Crystallite texture; Crystallite orientation distribution

Continuous cyclic bending (CCB) has been recently proposed as a useful straining technique to produce the high strain on the surface and the lower strain in the central layer of the sheet. The CCB and the subsequent annealing make it possible to produce gradient microstructure with different grained layers intentionally. The aim of the present study is to clarify formation mechanism and optimum thermomechanical conditions of cube texture sharpened remarkably in the surface layer during the CCB and the annealing in an Al-Mg base alloy. The obtained results are summarized as follows :(1) The as-received sample shows a weak cube texture in surface, middle and center layers. The 50-pass CCB leads to the sharper textures in all of the layers, especially in the surface layer. After annealing in a salt bath for 3.6 ks, the CCBent sample exhibits a typical cube texture sharpened in the surface layer.(2) To give the CCB and the annealing once more to the CCBent and annealed sample with strong cube texture results in the increase in fraction of cube component. The increase reveals that the CCB/annealing cycles affects the cube sharpening positively.(3) For 20-pass CCBent samples, the cube texture appears after annealing in a salt bath, while the texture is randomized after annealing both in Ar and in air.Consequently, it is found that the cube texture is sharpened by the CCB/annealing process. The CCB/annealing process enables to control crystallite orientation distribution by means of selecting processing conditions such as number of CCB passes, annealing atmosphere, annealing time and direction of CCB, and number of the CCB/annealing cycles.

最近提出了连续循环弯曲（CCB）作为一种有用的应变技术，可在板材表面产生高应变，并在板材中心层产生较低应变。 CCB 和随后的退火使得可以有意地产生具有不同晶粒层的梯度微观结构。本研究的目的是阐明 Al-Mg 基合金在 CCB 和退火过程中表面层显着锐化的立方织构的形成机制和最佳热机械条件。得到的结果总结如下： (1) 收到的样品在表层、中层和中心层显示出弱的立方体织构。 50 遍 CCB 会导致所有层中的纹理更加清晰，尤其是表面层。在盐浴中退火3.6 ks后，CCBent样品在表层呈现出典型的立方​​体织构。(2)对CCBent再次进行CCB和退火，退火后的样品具有强烈的立方体织构，结果增加以立方体分量的分数表示。这种增加表明CCB/退火循环对立方体锐化产生积极影响。(3) 对于20次CCBent样品，在盐浴中退火后出现立方体织构，而在Ar和空气中退火后织构是随机的。结果，发现立方体织构通过CCB/退火工艺变得锐化。 CCB/退火工艺能够通过选择加工条件（例如CCB道次、退火气氛、退火时间和CCB方向以及CCB/退火循环次数）来控制微晶取向分布。

项目成果

Y. Takayama, J. A. Szpunar, H. T. Jeong, T. Fujita, H. Kato: "Texture and Microtexture Development in an Al-Mg-Mn Alloy Sheet Worked by Continuous Cyclic Bending"Proceeding of the First Joint International Conference on Recrystallization and Grain Growth.

Y. Takayama、J. A. Szpunar、H. T. Jeong、T. Fujita、H. Kato：“连续循环弯曲的 Al-Mg-Mn 合金板材中的织构和微观织构发展”第一届再结晶和晶粒生长联合国际会议论文集

M. Kobayashi, Y. Takayama, H. Kato, T. Shibayanagi: "Computer Simulation of Grain Growth Based on Orientation Data of Pure Aluminum"Proceeding of the First Joint International Conference on Recrystallization and Grain Growth. Vol.1. 233-238 (2001)

M. Kobayashi、Y. Takayama、H. Kato、T. Shibayanagi：“基于纯铝取向数据的晶粒生长计算机模拟”第一届再结晶和晶粒生长联合国际会议论文集。

Y.Takayama, J.A.Szpunar, H.T.Jeong: "Cube Texture Development in an Al-Mg-Mn Alloy Sheet Worked by Continuous Cyclic Bending"Materials Transactions. 42巻10号. 2050-2058 (2001)

Y.Takayama、J.A.Szpunar、H.T.Jeong：“通过连续循环弯曲加工的 Al-Mg-Mn 合金板材中的立方体织构开发”《材料交易》第 42 卷，第 10 期。2050-2058 年（2001 年）

Y. Takayama et. al.: "Low Temperature Superplasticity in a Severely Rolled Sheet of an Al-4.2 mass%Mg Alloy"Proceedings of Intern. Conf. on Superplasticity of Advanced Materials. 165-170 (2000)

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Y.Takayama, J.A.Szpunar, H.T.Jeong, T.Fujita, H.Kato: "Texture and Microtexture Development in an Al-Mg-Mn Alloy Sheet Worked by Continuous Cyclic Bending"Proceeding of the First Joint International Conference on Recrystallization and Grain Growth. Vol. 2

Y.Takayama、J.A.Szpunar、H.T.Jeong、T.Fujita、H.Kato：“连续循环弯曲的 Al-Mg-Mn 合金板材中的织构和微观织构发展”第一届再结晶和晶粒生长联合国际会议论文集