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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Evolution of defect structures during cold rolling of ultrafine-grained Cu and Cu-Zn alloys: Influence of stacking fault energy
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Evolution of defect structures during cold rolling of ultrafine-grained Cu and Cu-Zn alloys: Influence of stacking fault energy

机译：超细晶粒铜和铜锌合金冷轧过程中缺陷组织的演变：堆垛层错能的影响

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摘要

Samples of pure Cu, bronze (Cu-10 wt.% Zn) and brass (Cu-30 wt.% Zn) with stacking fault energies (SFE) of 78,35, and 14 mJ/m~2, respectively, were processed by high-pressure torsion (HPT) and by a combination of HPT followed by cold-rolling (CR). X-ray diffraction measurements indicate that a decrease in SFE leads both to a decrease in crystallite size and to increases in microstrain, dislocation and twin densities for the HPT and HPT + CR processed ultrafine-grained (UFG) samples. Compared with processing by HPT, subsequent processing by CR refines the crystallite size of all samples, increases the twin densities of UFG bronze and brass, and increases the dislocation density in UFG bronze. It also decreases the dislocation density in UFG brass and leads to an unchanged dislocation density in UFG copper. The results suggest there may be an optimum stacking fault energy for dislocation accumulation in UFG Cu-Zn alloys and this has important implications in the production of materials having reasonable strain hardening and good tensile ductility.
机译：处理了分别具有78.35和14 mJ / m〜2的堆垛层错能（SFE）的纯Cu，青铜（Cu-10 wt。％Zn）和黄铜（Cu-30 wt。Zn）的样品通过高压扭转（HPT）和HPT的组合，然后进行冷轧（CR）。 X射线衍射测量表明，对于HPT和HPT + CR处理的超细颗粒（UFG）样品，SFE的降低不仅导致晶粒尺寸减小，而且导致微应变，位错和孪生密度增加。与HPT加工相比，CR的后续加工可细化所有样品的微晶尺寸，增加UFG青铜和黄铜的孪生密度，并增加UFG青铜的位错密度。它还降低了UFG黄铜中的位错密度，并导致UFG铜中的位错密度保持不变。结果表明，对于UFG Cu-Zn合金中的位错积累，可能存在最佳的堆垛层错能，这对于生产具有适当应变硬化和良好拉伸延展性的材料具有重要意义。

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