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.

已尝试使用强塑性应变技术来细化金属材料的晶粒尺寸。本研究涵盖了细化过程中的微观结构演变和静态退火过程中的微观结构稳定性的检查。1．通过改变模具中通道弯曲的角度来控制。发现当通过一次压制而不是通过多次压制施加大应变时，相邻晶粒之间具有大的取向差的晶粒增加。2． Mg比Al对晶粒尺寸细化有效：对于Al为-1μm，对于Al-1%Mg为-0.5μm，对于Al-3%Mg为-0.2μm。3当0.12%时，对晶粒尺寸几乎没有影响。将Zr添加到Al中，但晶粒尺寸为-1μm的细晶结构在高达300°C的温度下仍保持稳定，这比Al高100°C。 Al_3Zr颗粒的细分散对于抑制显着的晶粒生长具有重要意义。4．Cu中晶粒尺寸达到-0.3μm，高分辨电子显微镜显示Cu中晶界结构呈现出更不规则的结构。结论是，由于 Cu 的熔点比 Al 的熔点高，因此 Cu 的恢复效果较小。6 得出的结论是，强塑性应变技术是一种有用的生产方法。超细晶粒材料对于合金材料或熔化温度较高的金属来说晶粒细化更为有效。