采用两种不同模齿宽度的模具分别对纯铜进行室温模压变形,研究了模齿宽度对纯铜可承受的模压道次、晶粒尺寸和力学性能的影响以及晶粒尺寸和力学性能随模压道次的变化.结果表明:模压变形可以有效地细化纯铜的晶粒,且在模齿宽度小的模具中模压变形后的合金有更小的晶粒尺寸和更快的细化速率;纯铜在不同模具下进行变形,都能显著地提高其强度和硬度;模齿宽度对纯铜模压变形后的硬度和强度影响不大,但模齿宽度增大可提高纯铜可承受的模压道次,在模齿宽度较小的模具中变形后合金具有稍高的硬度和稍低的屈服强度及伸长率.
Pure copper sheets were subjected to groove pressing treat at two dies with different groove widths at room temperature. The effects of the dies with different groove widths on the groove pressing passes that the pure copper could bear, grain size and mechanical properties were examined, and the last two factors changing with the groove pressing passes was studied. The results show that the groove pressing was an effective way in refining the grains of the pure copper. When the specimen deformed at the die design with the smaller groove width, there were finer size of the grains and larger speed of the grain refinement. All the pure copper groove pressing treated at different dies had a remarkable impact on strength and hardness, but there was no significant effect in strength and hardness obtained under the die design conditions with different groove widths. The lager groove width could increase the groove pressing passes the pure copper bore. When the specimen deformed at the die design with the smaller groove width, the hardness was much higher and the yield strength and elongation were a little lower.
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