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Abstract: Ultra-fine grained pure Cu and Cu-Cr alloy were prepared by Equal-channel angular pressing. Their microstructure was tested to investigate the effect of Cr addition on structure evolution. The fine Cr precipitate particles are well dispersed in Cu-Cr alloy, which made its microstructure finer and grain boundaries more poorly-defined than that of pure Cu. But more pressing passes are required to attain a reasonably stable microstructure owing to the Cr precipitations reducing the dislocation mobility. All of those significant changes are due to the trace addition of Cr. Conclusions Ultra-fine grain pure Cu and Cu-Cr alloy were prepared by ECAP, the effect of Cr addition on their microstructure was investigated and discussed in the present work. The results have shown that the trace addition of Cr has an apparent effect on the materials’ microstructure. Due to the low SFE and precipitate strengthening of the metal, the effect of Cr addition in Cu on the microstructure is not as sharp as that of Mg addition in Al; however the effect is still visible. The microstructures of Cu-Cr alloy are finer and the grain boundaries are less defined than those of pure Cu. The mean grain size of pure Cu and Cu-Cr alloy under a stable structure were about ~305 nm and ~230 nm respectively; In addition, more ECAP passes are required in order to attain a reasonably stable microstructure in Cu-Cr alloy. Hardness of Cu-Cr alloy is significantly higher than those of pure Cu. The overlap effects of grain refinement, cold deformation and precipitation strengthening mechanisms, result in further hardness improvement in Cu-Cr alloy. All of those significant changes are due to the trace addition of Cr. [ Last edited by qingshaojun0823 on 2009-9-24 at 09:23 ] |
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fangbj
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xucz(金币+5,VIP+0):谢谢，辛苦了 9-23 13:13
xucz(金币+5,VIP+0):谢谢，辛苦了 9-23 13:13
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Abstract Ultra-fine grained pure Cu and Cu-Cr alloy were prepared by Equal-channel angular pressing method. The effect of Cr addition on microstructure of the alloy was investigated. As compared to the pure Cu, the Cu-Cr alloy exhibits finer microstructure, where the grain boundaries become blurry, due the homogenous dispersion of Cr precursors可以把前驱体的制法加上. However, higher pressing stress/压力？ is needed to obtain rather stable microstructure due to the decrease of dislocation mobility induced by Cr doping/固溶. 最后一句用不着. 先看看摘要，如果认可的话，再帮你看看结论。  |
7楼2009-09-23 10:07:06
xucz
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3楼2009-09-22 20:45:34
xucz
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4楼2009-09-22 22:06:58
