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激光烧结制备CrFeNiAlSiCux多孔高熵合金组织与性能
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辽宁工程技术大学

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TG113;TG115

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Microstructure and properties of CrFeNiAlSiCux porous high entropy alloy prepared by laser sintering
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Liaoning Technical University

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    摘要:

    在Cr、Fe、Ni、Al、Si纯粉末中添加非等摩尔比的Cu元素混合后压制成坯,采用激光自蔓延烧结制备CrFeNiAlSiCux(x=0-1.2)高熵合金。通过OM、XRD、SEM和EDS、维氏显微硬度计、磨粒磨损机及电化学工作站进行表征,分析物相结构、显微组织、密度和孔隙率、硬度、耐磨及耐蚀性能。结果表明:合金中BCC和FCC两相共存,随着Cu元素添加,FCC相增多,但BCC相仍多于FCC相,合金是典型树枝晶组织并伴有许多菊花状的组织,菊花状组织主要含有Cr、Fe、Si、Ni元素,枝晶间组织主要含有Cu元素。CrFeNiAlSiCu0.4综合性能最佳,显微硬度最大,为908.68 HV,单位面积磨损量最小,为48 mg·cm-2,腐蚀电流最小,为0.4100 μA/cm-2,腐蚀电位最大,为-149.264 mV。

    Abstract:

    In this paper, the high entropy alloy CrFeNiAlSiCux (x=0.2-1.2) is prepared by laser self-propagating sintering by adding non-equimolar ratio Cu element into Cr, Fe, Ni, Al and Si pure powder and then pressed into blank. It is characterized by OM, XRD, SEM and EDS, Vickers microhardness tester, abrasive wear machine and electrochemical workstation, and its phase structure, microstructure, density and porosity, hardness, wear resistance and corrosion resistance are analyzed. The results show that the sintered alloy always coexists with BCC and FCC phase. With the addition of Cu element, FCC phase increases, but BCC phase is still more than FCC phase. The alloy is a typical dendrite structure accompanied by many chrysanthemum like structures, which mainly contain Cr, Fe, Si and Ni elements, and interdendritic structure mainly contains Cu element. CrFeNiAlSiCu0.4 has the best comprehensive performance, the maximum microhardness is 908.68HV, the minimum wear per unit area is 48 mg·cm-2, the minimum corrosion current is 0.4100 A/cm-2, and the maximum corrosion potential is -149.264 mV.

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李刚,于中民.激光烧结制备CrFeNiAlSiCux多孔高熵合金组织与性能[J].稀有金属材料与工程,2021,50(12):4502~4508.[ligang, yuzhongmin. Microstructure and properties of CrFeNiAlSiCux porous high entropy alloy prepared by laser sintering[J]. Rare Metal Materials and Engineering,2021,50(12):4502~4508.]
DOI:10.12442/j. issn.1002-185X.20200956

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  • 收稿日期:2020-12-13
  • 最后修改日期:2021-01-19
  • 录用日期:2021-02-04
  • 在线发布日期: 2022-01-09
  • 出版日期: 2021-12-24