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.

首席研究员开发的压缩扭转成形能够在不改变金属形状的情况下向金属中引入大的塑性应变，该成形的优点被应用于控制一些轻金属的微观结构以及机械合金化合成。金属间化合物和纯铝的晶粒细化结果如下：<<金属间化合物的合成>>1．在形成的纯铝和钛粉末混合物中发现了机械合金化效应。成形过程中可以合成金属间化合物Al_3Ti。虽然仅在试样的加载面观察到了Al_3Ti的合成，但通过改变成形温度、压力和周期，合成区域可以扩展。3．可以与金属同时接合。<<纯铝的晶粒细化>>1.纯铝锭中100μm的晶粒可以通过压缩扭转细化到10μm以下。 2．虽然晶粒细化仅限于试样的加载面，但通过控制某些加载条件，细化区域可以扩展。3．低温和低试样高度对细化是有效的。