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首页> 外文期刊>Materials Science and Engineering >Effect of coherent Ll_2 nanoprecipitates on the tensile behavior of a fcc-based high-entropy alloy
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Effect of coherent Ll_2 nanoprecipitates on the tensile behavior of a fcc-based high-entropy alloy

机译：相干Ll_2纳米沉淀对fcc基高熵合金拉伸行为的影响

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摘要

Effect of coherent Ll_2 nanoprecipitates on the tensile behavior of a novel-designed Al_(0.2)CrFeCoNi_2Cu_(0.2) high-entropy alloy is investigated in this study. Different heat treatments after cold rolling were used to achieve the alloys with two different microstructures. One is composed of a fee matrix and coherent Ll_2 (Ni,Cu)_3Al nanoprecipitates after annealing at 700℃ for 20 h; the other owns a fee single-phase structure after annealing at 800 ℃ for 1 h as reference. Furthermore, the two alloys have nearly identical average grain sizes (-4.5 nm), and thus the exclusive effect of Ll_2 nanoprecipitates could be identified by directly comparing their tensile behaviors. It is shown that the presence of Ll_2 nanoprecipitates results in increases of 259 MPa and 316 MPa in the yield strength and ultimate tensile strength, respectively, accompanied by the maintenance of a high elongation (30.4%). This excellent strengthening effect is explained by the interaction between dislocations and Ll_2 nanoprecipitates during the tensile straining process. Dislocation shearing of the Ll_2 nanoprecipitates, which is evidently observed and also verified by the yield strength increment calculation, leads to predominant planar dislocation glide and the formation of crystallographically aligned slip bands as the main deformation mechanism, eventually resulting in a considerable work-hardening capacity enhancement with almost none harm to the elongation.
机译：研究了相干的Ll_2纳米沉淀对新型设计的Al_（0.2）CrFeCoNi_2Cu_（0.2）高熵合金的拉伸行为的影响。冷轧后的不同热处理用于获得具有两种不同显微组织的合金。一个由电荷矩阵组成，并且在700℃退火20 h后，相干的Ll_2（Ni，Cu）_3Al纳米沉淀形成。另一种在800℃退火1 h后具有单相结构。此外，这两种合金具有几乎相同的平均晶粒尺寸（-4.5 nm），因此可以通过直接比较它们的拉伸行为来确定Ll_2纳米沉淀的排他作用。结果表明，Ll_2纳米沉淀的存在导致屈服强度和极限抗拉强度分别增加259 MPa和316 MPa，同时保持了较高的伸长率（30.4％）。这种出色的强化效果是由拉伸应变过程中位错与Ll_2纳米沉淀之间的相互作用所解释的。 Ll_2纳米析出物的位错剪切被明显观察到，并且也通过屈服强度增加计算得到了证实，导致主要的平面位错滑移和晶体取向滑移带的形成是主要的变形机制，最终导致相当大的加工硬化能力增强，几乎不损害伸长率。

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  • 来源
    《Materials Science and Engineering》 |2017年第1期|503-510|共8页
  • 作者

    Z.G. Wang; W. Zhou; L.M. Fu; J.F. Wang; R.C. Luo; X.C. Han; B. Chen; X.D. Wang;

  • 作者单位

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

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  • 正文语种 eng
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  • 关键词

    High-entropy alloy; Precipitation-hardening; Work-hardening; Slip band;

    机译：高熵合金;沉淀硬化;工作硬化;滑带;

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