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Development of Ultrafine-Grained Metallic Materials Using Intense Plastic Straining Technique

利用强塑性应变技术开发超细晶金属材料

基本信息

批准号：
07555660
负责人：
HORITA Zenji
金额：
$ 0.7万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555660/
关键词：
Intense plastic straing Grain Size refinement Al Cu Al-Mg alloys Al-Zr alloys Microstructural stability Grain boundary structure 微細結晶粒組織硬度測定結晶粒界 ECAP法

项目摘要

Grain size refinement of metallic materials has been attempted using an intense plastic straining technique. This study has covered examinations of microstructural evolution during refining process and of microstructural stability during static annealing. The results are summarized as follows.1. The strain introduced in the material was controlled by changing the angle where a channel was bent in a die. It was found that the grains with large misorientations between neighboring grains increased when a large strain was imposed by one pressing rather than by many pressings.2. Addition of Mg to Al was effective to grain size refinement : -1 mum for Al but -0.5 mum for Al-1%Mg and -0.2 mum for Al-3%Mg.3. There was almost no effect on the grain size when 0.12%Zr was added to Al, but the fine grain structure with a grain size of -1 mum remained stable up to a temperature of 300ﾟC which is higher by 100ﾟ than for Al. It was found that the presence of a fine dispersion of Al_3Zr particles was important for the inhibitation of significant grain growth.4. A grain size of -0.3 mum was attained in Cu.5. High-resolution electron microscopy revealed that the grain boundary structure exhibits more irregular configuration in Cu than in Al. It was concluded that the effect of recovery is less in Cu as the melting point of Cu is fairly higher than that of Al.6. It was concluded that the intense plastic straining technique is a useful method for the production of ultrafine grained materials. The grain size refinement is more effective for alloyed materials or for metals with higher melting temperatures.

金属材料的晶粒尺寸细化已经尝试使用强塑性应变技术。这项研究包括在精炼过程中的显微组织演变和静态退火过程中的显微组织稳定性的检查。研究结果如下：1.引入材料中的应变通过改变通道在模具中弯曲的角度来控制。研究发现，当施加一次大应变时，相邻晶粒间存在较大取向差的晶粒数量增加.向Al中添加Mg对晶粒尺寸细化是有效的：对于Al为-1 μ m，但对于Al-1%Mg为-0.5 μ m，对于Al-3%Mg为-0.2 μ m。当添加0.12%Zr到Al中时，对晶粒尺寸几乎没有影响，但晶粒尺寸为-1 μ m的细晶粒结构在300 ℃（比Al高100 ℃）下仍保持稳定。研究发现，Al_3Zr颗粒的细分散对于阻止显著的晶粒生长是重要的。在Cu中获得了~ 0.3 μ m的晶粒尺寸。高分辨电子显微镜显示，晶界结构表现出更多的不规则配置在Cu比在Al.它的结论是恢复的影响是在Cu的熔点比Al的相当高.结果表明，强塑性变形技术是制备超细晶材料的一种有效方法。晶粒尺寸细化对于合金材料或具有较高熔化温度的金属更有效。