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The defect structures and mechanical properties of Cu and Cu-Al alloys processed by split Hopkinson pressure bar

机译：分流霍普金森压力棒加工Cu和Cu-Al合金的缺陷组织和力学性能

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摘要

Pure Cu, Cu-5 at%Al, Cu-10 at%Al and Cu-15 at%Al with different stacking fault energy (SFE) of 78, 37, 7 and 5 mKJ/m~2, respectively, were processed through split Hopkinson pressure bar (SHPB) with the strain rate of 10~3/sec. The influence of high strain rate on the evolution of microstructures and mechanical properties of Cu and Cu-Al alloys was investigated. X-ray diffraction measurements indicate that, the microstructures of Cu and Cu-Al alloys have been refined to the nano scale after deformed by SHPB, and with decreasing SFE, the average grain size decreases gradually from 72 to 40 nm, while the dislocation density increases from 0.55 × 10~(14) to 4.4 × 10~(14) m~(-2) and the twin density increases from 0.04% to 1.07%. The formation of deformation twins is an additional factor that contributes to the microhardness and strength of Cu and Cu-Al alloys except the solid solution strengthening effect. Cu-15 at%Al has the biggest strain hardening rate at larger strains due to its lowest SFE which results in the highest twin density. The results confirm that lower SFE improves both strength and strain hardening rate of materials.
机译：通过分别处理78、37、7和5 mKJ / m〜2的不同堆垛层错能（SFE）的纯Cu，Cu-5 at％Al，Cu-10 at％Al和Cu-15 at％Al将霍普金森压力棒（SHPB）分开，应变速率为10〜3 / sec。研究了高应变速率对Cu和Cu-Al合金组织演变和力学性能的影响。 X射线衍射测量表明，Cu和Cu-Al合金经SHPB变形后已细化到纳米级，并且随着SFE的降低，平均晶粒尺寸从72 nm逐渐减小到40 nm，而位错密度从0.55×10〜（14）增加到4.4×10〜（14）m〜（-2），孪晶密度从0.04％增加到1.07％。形变孪晶的形成是除了固溶强化作用之外还有助于Cu和Cu-Al合金的显微硬度和强度的另一个因素。 Cu-15 at％Al在较大应变下具有最大的应变硬化速率，这是因为其最低的SFE导致最高的孪晶密度。结果证实，较低的SFE可以提高材料的强度和应变硬化率。

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  • 来源
    《Materials Science and Engineering》 |2013年第15期|406-409|共4页
  • 作者

    Jingmei Tao; Kai Yang; Haiwu Xiong; Xiaoxiang Wu; Xinkun Zhu; Cuie Wen;

  • 作者单位

    Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;

    Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;

    Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;

    Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;

    Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;

    Faculty of Engineering and Industrial Science, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia;

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  • 正文语种 eng
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  • 关键词

    Cu and Cu-Al alloys; Split Hopkinson pressure bar; High strain rate; Stacking fault energy; Deformation twins;

    机译：铜和铜铝合金;分离式霍普金森压力杆;高应变率堆积故障能量;变形双胞胎;

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