多向压缩对超细晶多组元铜合金组织和硬度的影响

Effect of Multi-directional Compression on Microstructure and Hardness of Ultrafine Grained Multi-component Copper alloy

利用多向压缩技术对多组元铜合金进行了大塑性变形,通过OM、SEM研究了合金组织演变,利用显微硬度仪分析了合金的硬度变化。结果表明：经过室温多向压缩,多组元铜合金晶粒内部出现大量的滑移带,相互交割,晶粒明显细化,200次压缩后,形成了平均晶粒尺寸处于亚微米级的超细晶组织;合金的硬度随着压缩道次增加而增加,初期增加明显,50道次后变得缓慢,200次压缩后硬度值达到初始状态的2倍。

The multi-component copper alloy was subjected to large plastic deformation by multi-directional compression technology. The microstructure evolution of the alloy was studied by OM and SEM. The hardness change of the alloy was analyzed by micro-hardness tester. The results show that after multidirectional compression at room temperature, a large number of slip bands appear in the grains of multi-component copper alloy, which are delivered to each other and the grains are obviously refined. After 200 passes of compression, the ultrafine grain microstructure with an average grain size of sub-micron is formed.The hardness of the alloy increases with the increase of compression passes. At initial stage the increase is obvious. After 50 passes, it becomes slow. The hardness value of the alloy reaches twice that of the initial state after 200 compression passes.