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The influence of strain rate, deformation temperature and stacking fault energy on the mechanical properties of Cu alloys

机译：应变率，变形温度和堆垛层错能对铜合金力学性能的影响

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摘要

Cu-Ge alloys with different stacking fault energies (SFEs) were prepared by induction melting and processed by severe plastic deformation (SPD) using three different deformation techniques, including rolling at room temperature (RTR), rolling at the liquid nitrogen temperature (LNR), and Split Hopkinson Pressure Bar (SHPB) impact followed by room temperature rolling (HK+RTR). The effects of SFE, strain rate and deformation temperature on the microstructures and mechanical properties were systematically investigated by X-ray diffraction analyses and tensile tests. It was found that the dislocation density and twin density of all the Cu alloys after the SPD processing increased with decreasing SFE, increasing strain rate or reducing deformation temperature, which led to simultaneously enhanced strength and improved ductility due to effective grain refinement. The mechanical properties of the Cu alloys can be optimized to a combination of high strength and excellent ductility by lowering the SFE, the intrinsic property of metals, or manipulating the extrinsic deformation conditions, that is, increasing strain rate, and/or decreasing deformation temperature.
机译：通过感应熔化制备具有不同堆垛层错能（SFE）的Cu-Ge合金，并使用三种不同的变形技术，包括在室温下轧制（RTR），在液氮温度下轧制（LNR），通过严重塑性变形（SPD）进行处理。 ，以及斯普利特霍普金森压力杆（SHPB）的影响，然后进行室温滚动（HK + RTR）。通过X射线衍射分析和拉伸试验，系统地研究了SFE，应变速率和变形温度对组织和力学性能的影响。结果发现，SPD处理后所有Cu合金的位错密度和孪晶密度都随着SFE的降低，应变率的提高或变形温度的降低而增加，这归因于有效的晶粒细化，同时提高了强度和延展性。通过降低SFE，金属的固有特性或控制外部变形条件（即提高应变速率和/或降低变形温度），可以优化Cu合金的机械性能，使其兼具高强度和出色的延展性。

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  • 来源
    《Materials Science and Engineering》 |2013年第20期|199-204|共6页
  • 作者

    Y.L. Gong; C.E. Wen; X.X. Wu; S.Y. Ren; LP. Cheng; X.K. Zhu;

  • 作者单位

    Faculty of Science, Kunming University of Science and Technology, Kunming, Yunnan, China;

    Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, John Street, Hawthorn, Victoria 3122, Australia;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China;

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  • 正文语种 eng
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  • 关键词

    Copper alloys; Stacking fault energy (SFE); Strain rate; Temperature; Mechanical properties;

    机译：铜合金;堆放故障能量（SFE）;应变率;温度;机械性能;

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