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首页> 外文期刊>Materials Science and Engineering >The microstructure and mechanical properties of novel Al-Cr-Fe-Mn-Ni high- entropy alloys with trimodal distributions of coherent B2 precipitates
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The microstructure and mechanical properties of novel Al-Cr-Fe-Mn-Ni high- entropy alloys with trimodal distributions of coherent B2 precipitates

机译：新型Al-Cr-Fe-Mn-Ni高熵合金的微观结构和力学性能，具有连贯B2沉淀的三峰分布

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摘要

A series of novel Co-free AlxCrFeMnNi (x = 0.5-0.8) high-entropy alloys (HEM) with trimodal distributions of coherent B2 precipitates was fabricated. A fundamental investigation on the microstructural evolution and mechanical properties of these trimodal alloys was conducted. Structural characterization shows that these HEM possess complex microstructures consisting of a disordered body-centered-cubic (BCC) matrix and trimodal-size distributions of the ordered coherent B2 precipitates, (1) the primary B2 (p-B2) precipitates with a mean length of similar to 2 mu m located in the interdendritic region, (2) the secondary B2 (s-B2) precipitates with a mean diameter of similar to 450 nm, and (3) the tertiary B2 (t-B2) precipitates with a mean diameter of similar to 20 nm located in the dendritic region. The trimodal HEM exhibit a good combination of high compressive yield strengths of 1091-1200 MPa and the large plasticity ( 45%). The increments of the yield strengths caused by different strengthening mechanisms have been quantitatively and respectively estimated and compared with the experimental measurements. The study of the present trimodal BCC-B2 HEAs can provide a useful guidance for the future development of multimodal BCC-based HEM with excellent properties.
机译：制造了一系列新型的共有共有的Alxcrfemni（x = 0.5-0.8）高熵合金（下摆），具有连贯的B2沉淀物的三码分布。对这些三极合作合金微观结构演化和力学性能进行了根本研究。结构表征表明，这些下摆具有复杂的微结构，其由无序的身体中心 - 立方（BCC）基质组成，有序相干B2的沉淀物的沉淀物的三峰尺寸分布，（1）主要B2（P-B2）沉淀出平均长度与位于interdendritic区域中的2μm相似，（2）次级B2（S-B2）沉淀的平均直径与450nm相似，（3）叔B2（T-B2）用平均值沉淀直径与位于树突区中的20nm相似。 Trimodal HEM表现出高压缩屈服强度的良好组合1091-1200MPa和大的塑性（> 45％）。由不同强化机制引起的屈服强度的增量已经定量，分别估计并与实验测量进行比较。目前的Trimodal BCC-B2 SEE的研究可以为未来的基于多媒体BCC的下摆的开发提供了具有优异性能的有用指导。

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  • 来源
    《Materials Science and Engineering》 |2019年第may29期|160-171|共12页
  • 作者

    Zhang L. J.; Guo K.; Tang H.; Zhang M. D.; Fan J. T.; Cui P.; Ma Y. M.; Yu P. F.; Li G.;

  • 作者单位

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China|Ctr High Pressure Sci & Technol Adv Res Beijing 100094 Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China;

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  • 正文语种 eng
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  • 关键词

    High-entropy alloy; Coherent precipitates; Multimodal distributions; Microstructural evolution; Strengthening mechanisms;

    机译：高熵合金;相干沉淀物;多模式分布;微观结构演化;加强机制;

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