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.

压扭成形是由主要研究者发展起来的一种成形方法，它能在不改变金属形状的情况下使金属产生较大的塑性应变。该成形技术的优点已应用于轻金属的组织控制、金属间化合物的机械合金化合成和纯铝的晶粒细化。结果如下：&lt;< Synthesis of an intermetallic compound >&gt;1.纯铝和钛的混合粉末在成形过程中产生了机械合金化效应，并在成形过程中生成了金属间化合物Al_3Ti.虽然Al_3Ti的合成只发生在试样的加载侧，但随着成形温度、压力和循环次数的变化，合成区域会扩展.合成的金属间化合物可以与金属同时连接。&lt;< Grain refinement of a pure aluminum >&gt;1.压扭成形可使纯铝铸锭中100 μm的晶粒细化到10 μm以下.虽然晶粒细化仅限于加载侧，但通过控制一定的加载条件，细化区域可以扩展.低温和低试样高度是细化的有效方法。