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The role of temperature in the strengthening of Cu-Al alloys processed by surface mechanical attrition treatment

机译：温度在表面机械磨损处理过程中强化Cu-Al合金的作用

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摘要

In the present work, Cu-Al alloys were processed by surface mechanical attrition treatment (SMAT) under both room and liquid nitrogen temperature (LNT) conditions. In contrast to room temperature (RT) SMAT, dynamic recovery and recrystallization were largely suppressed during the LNT process. A gradient microstructure was obtained due to the gradient strain and strain rate impacted onto the sample. Microhardness measurement showed that the hardness values gradually decreased from the top surface to the central region. The local hardness of the top surface layer of the LNT and RT SMAT Cu-4.5% Al samples reached maximum values of 1.52 and 1.28 GPa, respectively. The Cu-4.5% Al alloy exhibited an improved yield strength of ～496 MPa and a higher ductility (compared with literature data of Cu-Al alloys synthesized traditional severe plastic deformation methods) of 15.4% after the LNT SMAT process. A brittle-ductile failure pattern was easily distinguished after fracture. Moreover, the LNT SMAT is a low-cost process with high productivity and can be applied to various types of metallic production.
机译：在目前的工作中，通过在室温和液氮温度（LNT）条件下通过表面机械磨损处理（SMAT）处理Cu-Al合金。与室温（RT）SMAT相比，在LNT工艺过程中，动态恢复和重结晶受到很大抑制。由于梯度应变和应变率影响到样品，因此获得了梯度微结构。显微硬度测量表明，硬度值从顶表面到中心区域逐渐降低。 LNT和RT SMAT Cu-4.5％Al样品的上表面层的局部硬度分别达到1.52和1.28 GPa的最大值。经过LNT SMAT处理后，Cu-4.5％铝合金的屈服强度提高了约496 MPa，延展性更高（与传统的严重塑性变形方法合成的Cu-Al合金文献数据相比）为1​​5.4％。断裂后容易区分脆性-延性破坏模式。此外，LNT SMAT是一种低成本且高生产率的工艺，可应用于各种类型的金属生产。

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  • 来源
    《Journal of Materials Research》 |2015年第10期|1670-1677|共8页
  • 作者

    Lele Sun; Baozhuang Cai; Cuie Wen; Yanzhao Pang; Yu Shen; Xinkun Zhu;

  • 作者单位

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

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

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Bundoora, Victoria 3083, Australia;

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

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

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, 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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