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首页> 外文期刊>Materials Science and Engineering >Remarkable strength of a non-equiatomic Co_(29)Cr_(29)Fe_(29)Ni_(12.5)W_(0.5) high-entropy alloy at cryogenic temperatures
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Remarkable strength of a non-equiatomic Co_(29)Cr_(29)Fe_(29)Ni_(12.5)W_(0.5) high-entropy alloy at cryogenic temperatures

机译：非赤型CO_（29）CR_（29）FE_（29）的显着强度，在低温温度下的NI_（12.5）W_（0.5）高熵合金

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摘要

A non-equiatomic Co_(29)Cr_(29)Fe_(29)Ni_(12.5)W_(0.5) high-entropy alloy (HEA) strengthened by two-step rolling was fabricated, and its microstructure evolution and tensile behavior at cryogenic temperatures were investigated. When the temperature decreases from 293 K to 173 K, the yield strength increases from 640 MPa to 1017 MPa. At 77 K, an outstanding strength-ductility synergy can be observed, with a yield strength of 1.33 GPa and an excellent ductility of 46%. Prior to tensile testing, the annealed alloy largely has a single face-centered cubic (FCC) structure, while a hexagonal-close packed (HCP) phase is formed in the cryogenically tensile-fractured alloy along the {111} planes. Such high yield strength and tensile plasticity values at cryogenic temperatures are extremely rare in HEAs and even in metal alloys. The deformation micro-mechanism was carefully investigated by a transmission electron microscope, and the results indicated that the cryogenic-temperature properties could be attributed to stacking faults (SFs) and the phase having a hexagonal-close-packed (HCP) structure. The densities of the SFs and the HCP laths have a considerable influence on the work-hardening behavior.
机译：由两步轧制强化强化的非赤型CO_（29）CR_（29）CR_（29）FE_（29）FE_（12.5）Ni_（12.5）W_（0.5）高熵合金（HEA），以及在低温温度下的微观结构演化和拉伸行为被调查了。当温度从293 k降低至173k时，屈服强度从640MPa增加到1017MPa。在77 k下，可以观察到出色的强度 - 延展性协同作用，屈服强度为1.33GPa，优异的延性为46％。在拉伸测试之前，退火合金大大面临单一面对面的立方（FCC）结构，而沿{111}平面沿着{111}架的低温裂缝裂缝合金形成六边形密封填料（HCP）相。这种高屈服强度和在低温温度下的拉伸塑性值在塞满和甚至在金属合金中非常罕见。通过透射电子显微镜仔细研究变形微机理，结果表明，低温 - 温度特性可归因于堆叠故障（SFS）和具有六边形封装（HCP）结构的相位。 SFS和HCP板路的密度对工作 - 硬化行为有相当大的影响。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141446.1-141446.10|共10页
  • 作者

    Chengbin Wei; Yiping Lu; Xinghao Du; Tingju Li; Tongmin Wang; Peter K. Liaw;

  • 作者单位

    Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China;

    School of Materials Science and Engineering Shenyang Aerospace University Shenyang 110136 China;

    Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China;

    Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-entropy alloys; Dislocation; Stacking fault; Phase transformation; Mechanical properties;

    机译：高熵合金;错位;堆叠故障;相变;机械性能;

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