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首页> 外文期刊>Materials Science and Engineering >Microstructures and mechanical properties of body-centered-cubic (Al, Ti)_(0.7)(Ni,Co,Fe,Cr)_5 high entropy alloys with coherent B2/L2_1 nanoprecipitation
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Microstructures and mechanical properties of body-centered-cubic (Al, Ti)_(0.7)(Ni,Co,Fe,Cr)_5 high entropy alloys with coherent B2/L2_1 nanoprecipitation

机译：B2 / L2_1纳米相干的体心立方（Al，Ti）_（0.7）（Ni，Co，Fe，Cr）_5高熵合金的组织和力学性能

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摘要

Coherent precipitation of cuboidal B2/L21nanoparticles in body-centered-cubic (BCC) based high entropy alloys (HEAs) is crucial for the improvement of mechanical properties. The present work investigated the influence of Ti addition on the phase constitutions and particle morphology in (Al,Ti)0.7M5HEAs (M = Ni1Co1Fe1.5Cr1.5and Ni1Co1Fe1Cr2) with different Al/Ti ratios. Series of alloy rods were prepared by suction-cast processing, and their microstructures and mechanical properties were then characterized comprehensively. It was found that the substitution of Ti for Al can change the phase structures of ordered precipitates, from B2-NiAl to L21-Ni2AlTi. Furthermore, the particle morphology of L21/B2 precipitates is closely related to the lattice misfitεbetween L21/B2 phase and BCC matrix, in which a moderateε(ε = 0.4–0.5%) can contribute to the formation of cuboidal L21/B2 precipitates in BCC matrix, while a largeε(ε > 1.0%) will cause a lath-like microstructure. High compressive yield strengths (above 1500 MPa) of these Al/Ti-contained HEAs with cuboidal coherent microstructure are primarily attributed to the particle size in light of the precipitation strengthening mechanism. In addition, the excess addition of Ti will transform the matrix structure of alloys from the BCC to the σ phase, leading to a serious brittleness.
机译：在基于体心立方（BCC）的高熵合金（HEA）中长方体B2 / L21纳米粒子的连贯沉淀对于改善机械性能至关重要。本工作研究了不同Al / Ti比的Ti对（Al，Ti）0.7M5HEAs（M = Ni1Co1Fe1.5Cr1.5和Ni1Co1Fe1Cr2）的相组成和颗粒形态的影响。通过抽铸工艺制备了一系列合金棒，然后对它们的显微组织和力学性能进行了综合表征。发现用Ti代替Al可以改变有序析出物的相结构，从B2-NiAl到L21-Ni2AlTi。此外，L21 / B2析出物的颗粒形态与L21 / B2相和BCC基体之间的晶格失配密切相关，其中适度的ε（ε= 0.4–0.5％）有助于在BCC中形成长方体的L21 / B2析出物较大的ε（ε> 1.0％）会导致板条状的微观结构。这些具有长方体相干微观结构的含Al / Ti的HEA的高抗压屈服强度（高于1500 MPa）主要归因于沉淀增强机理的粒径。此外，过量添加Ti将使合金的基体结构从BCC转变为σ相，从而导致严重的脆性。

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  • 来源
    《Materials Science and Engineering》 |2018年第8期|286-296|共11页
  • 作者

    Chunling Li; Yue Ma; Jiamiao Hao; Yu Yan; Qing Wang; Chuang Dong; Peter K. Liaw;

  • 作者单位

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology;

    School of Materials Science and Engineering, Liaocheng University;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology;

    Department of Materials Science and Engineering, University of Tennessee;

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  • 正文语种 eng
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  • 关键词

    High entropy alloys; Coherent precipitation; Phase transformation; Lattice misfit; Precipitation strengthening;

    机译：高熵合金;相干析出;相变;晶格失配;析出强化;

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