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采用真空磁悬浮炉熔炼了Al0.25CrFeMn1.3Ni高熵合金，利用场发射扫描电镜、X射线衍射和场发射电子探针显微分析等研究了不同温度时效处理对其显微组织及耐磨性能的影响。结果表明：铸态合金的组织由Cr-Mn-Fe-Ni FCC相基体、Al-Ni-Mn B2相粒状组织和Fe-Cr-Mn BCC相枝晶基体组成。时效处理后，枝晶基体由BCC相转变为σ(Fe-Cr)相，又因合金长时间保温出现软化，使得合金硬度随时效时间的增加先升高后降低，硬度均在时效10 h时达到峰值，随时效温度升高，合金峰值硬度降低。此外，合金表现出良好的耐磨性，磨损120 min后相较于316L不锈钢的磨损质量损失，铸态合金为其的11.9%,750℃时效10 h后合金的磨损质量损失最低，仅为其的5.7%。铸态合金以氧化磨损为主，伴随有粘着磨损和磨粒磨损，随时效温度的升高，合金磨损机理由以粘着磨损为主转变为以分层磨损为主。
Abstract：Al0.25CrFeMn1.3Ni high-entropy alloy was smelted using a vacuum magnetic levitation furnace, and the effect of aging treatment at different temperatures on microstructure and wear resistance of the Al0.25CrFeMn1.3Ni high-entropy alloy was studied by means of field emission scanning electron microscopy, X-ray diffraction and field emission electron probe microanalysis. The results show that the microstructure of the as cast alloy is composed of Cr-Mn-Fe-Ni FCC phase matrix, Al-Ni-Mn B2 phase granular structure and Fe-Cr-Mn BCC phase dendrite matrix. After aging treatment, the dendrite matrix changes from BCC phase to σ(Fe-Cr) phase, and the alloy softens due to the long-term holding time, so that the hardness of the alloy first increases and then decreases with the increase of aging time. The hardness reaches the peak value when aging for 10 h, and the peak hardness of the alloy decreases with the increase of aging temperature. In addition, the alloy exhibits good wear resistance. After 120 min of wear, compared with 316 L stainless steel, the wear mass loss of the as cast alloy is 11.9% that of the 316 L stainless steel, and the wear mass loss of the alloy aged at 750 ℃ for 10 h is the lowest, which is only 5.7% that of the 316 L stainless steel. The wear mechanism of the as-cast alloy is mainly oxidized wear, accompanied by adhesive wear and abrasive wear. With the increase of aging temperature, the wear mechanism of the alloy changes from adhesive wear to delamination wear.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2021-0469
中图分类号:TG139;TG156.92
引用信息:
[1]徐云峰,黄峰,张恒康等.时效处理对Al_(0.25)CrFeMn_(1.3)Ni高熵合金显微组织演变及耐磨性的影响[J],2022,43(04):97-106.DOI:10.13289/j.issn.1009-6264.2021-0469.
基金信息:
国家自然科学基金(51871172)