Microstructure Controlled Forming of High Performance Light Metals by Combined Loading under compression and Torsion

压缩和扭转联合加载高性能轻金属微观结构控制成形

• 批准号: 11555183
• 负责人: KANETAKE Naoyuki
• 金额: $ 8.7万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555183/
• 关键词: aluminum alloy; intermetallic compound; structural control; grain refinement; shear stress; mechanical alloying; compressive torsion forming; 粉末成形法; 軽金属材料; 圧縮ねじり成形法

The compressive -torsion forming, which had be developed by the head investigator, is enable to introduce large plastic strain into a metal without changing its shape. The advantage of the forming was applied to control microstructures of some light metals, and mechanical alloying synthesis of an intermetallic compound and grain refinement of a pure aluminum. The results were as follows ;<< Synthesis of an intermetallic compound >>1. A mechanical alloying effect was found in the forming powder mixture of pure aluminum and titanium, and an intermetallic compound Al_3Ti could be synthesized by the forming process.2. Although the synthesis of the Al_3Ti was observed only in loading side of a specimen, the synthesized region can spread by changing in forming temperature, pressure and cycle.3. The synthesized intermetallic compound can be joined simultaneously with metals.<< Grain refinement of a pure aluminum >>1. Grains of 100 μm in the pure aluminum ingot can be refined under 10 μm by the compressive -torsion forming.2. Although the grain refinement was limited only in loading side of a specimen, the refined region can spread by controlling some loading conditions.3. Low temperature and low specimen height are effective to the refinement.

由头部调查员开发的压缩 - 变形形成使得可以将大型塑性应变引入金属而不会改变其形状。形成的优势应用于控制某些光金属的微观结构，并将机械合金合成金属间的金属合成和纯铝的晶粒细化。结果如下； <<金属间化合物的合成>> 1。在纯铝和钛的形成粉末混合物中发现了机械合金效应，并且可以通过形成过程合成金属间化合物Al_3Ti。2。尽管仅在样品的加载侧观察到Al_3Ti的合成，但合成区域可以通过变化的温度，压力和周期来扩散。3。合成的金属间化合物可以与金属轻松连接。<<纯铝的谷物细化>> 1。在纯铝铸锭中的100μm晶粒可以通过抗压剂形成在10μm下进行完善。2。尽管谷物的细化仅在样品的加载侧受到限制，但精制区域可以通过控制某些负载条件来扩散。3。低温和低样本高度可有效地细化。