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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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3楼2009-09-22 20:45:34
xucz
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2楼2009-09-22 14:37:05
xucz
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4楼2009-09-22 22:06:58
goodtimega
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
xucz(金币+30,VIP+0):谢谢兄台，改的很好，除了pristine Cu（纯铜）意见相左之外，其他地方都挺好。 9-23 13:11
xucz(金币+30,VIP+0):谢谢兄台，改的很好，除了pristine Cu（纯铜）意见相左之外，其他地方都挺好。 9-23 13:11
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Abstract: Ultra-fine grained pristine Cu and Cu-Cr alloy were prepared by equal-channel angular pressing. The microstructure was tested in order to investigate the effect of Cr addition on structural evolution. The fine Cr precipitate particles were well dispersed in Cu-Cr alloy, which madefiner microstructure and less well-defined grain boundaries as compared that of pristine Cu. On the other hand, additional pressing paths were required to attain a reasonably stable microstructure owing to Cr precipitations reducing the dislocation mobility. Significant changescan be attributed to the trace addition of Cr. Conclusions Ultra-fine grain pristine Cu and Cu-Cr alloy were prepared by ECAP. The effect of Cr addition on the microstructure was investigated and discussed in the present work. The results indicate 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 less sharp than that of Mg addition in Al. However, the effect remains visible. The microstructures of Cu-Cr alloy are finer and the grain boundaries are less well-defined than those of pristine Cu. The mean grain size of pure Cu and Cu-Cr alloy under a stable structure are about ~305 and ~230 nm, respectively. In addition, more ECAP paths 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 pristine Cu. The overlap effects of grain refinement, cold deformation, and precipitation strengthening mechanisms, result in further hardness improvement in Cu-Cr alloy. All significant changes are attributed to the trace addition of Cr. |
5楼2009-09-23 09:29:02
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