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Strain induced hardening and softening behaviors of deformed Cu and Cu-Ge alloys

机译：变形Cu和Cu-Ge合金的应变诱导硬化和软化行为

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摘要

Herein, Cu and Cu-Ge alloys with different stacking fault energies (SFEs) are prepared via rolling at room temperature (RTR) and via a combination of high-pressure torsion (HPT) and RTR (HPT + RTR). The x-ray diffraction measurements reveal that the grain size, dislocation density, and twin density vary with the strain and SFEs. The tensile tests indicate that the strength of materials with medium SFEs increases initially and then slightly declines, while the ductility is enhanced by increasing the strain via HPT. In contrast, for low-SFE materials, enhanced strength and improved ductility may be achieved simultaneously through increasing the strain to a high level. The variation of strength with respect to strain is primarily dependent on the solute concentration and SFE. The underlying mechanisms governing the effect of strain and SFE on the microstructures and mechanical properties of the metals are also discussed.
机译：在此，通过在室温下轧制（RTR）并通过高压扭转（HPT）和RTR（HPT + RTR）的组合来制备具有不同堆垛层错能（SFE）的Cu和Cu-Ge合金。 X射线衍射测量表明，晶粒尺寸，位错密度和孪晶密度随应变和SFE的变化而变化。拉伸试验表明，具有中等SFE的材料的强度先增加，然后略有下降，而通过HPT增加应变可增强延展性。相反，对于低SFE材料，可以通过将应变增加到较高水平来同时获得增强的强度和改善的延展性。相对于应变的强度变化主要取决于溶质浓度和SFE。还讨论了控制应变和SFE对金属的微观结构和机械性能的影响的潜在机理。

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  • 来源
    《Journal of Materials Research》 |2016年第5期|599-608|共10页
  • 作者

    Y.L. Gong; H.S. Kim; S.Y. Ren; S.D. Zeng; X.K. Zhu;

  • 作者单位

    Faculty of Science, Kunming University of Science and Technology, Kunming 650093, Yunan Province, China;

    Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea;

    Ningbo Powerway Alloy Material Co., Ltd, Ningbo 315135, Zhejiang Province, China;

    Department of Thermal Engineering, Yunnan Institute of Measuring and Testing Technology, Kunming 650228, Yunan Province, China;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunan Province, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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