Effect of carbide ceramic particles on the microstructure and mechanical properties of dual-phase high-entropy alloy matrix composites
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摘要: 高熵合金拓宽了复合材料中金属基体的选用范围。本文通过外加碳化物陶瓷颗粒,利用电弧熔炼技术制备Fe49.5Mn30Co10Cr10X0.5 (X=B4C、ZrC和TiC)等3种高熵合金复合材料,系统研究3种碳化物陶瓷颗粒对双相高熵合金基复合材料微观组织和力学性能的影响。研究结果表明:掺杂碳化物陶瓷颗粒均可细化高熵合金基体的晶粒尺寸,稳定fcc相,抑制hcp相形成,其中B4C陶瓷颗粒细化晶粒和稳定fcc相效果最显著。掺杂ZrC和B4C陶瓷颗粒样品,力学性能低于高熵合金基体样品,归因于ZrC和B4C陶瓷颗粒与基体之间的界面结合情况不佳,界面处出现孔洞性缺陷;而掺杂TiC陶瓷颗粒样品,其强韧化效果显著,归因于良好的界面结合、细晶强化、弥散强化及颗粒承载强化等。Abstract: The emergence of new high-entropy alloys has broadened the selection range of metal matrix compo-sites. In this study, carbide ceramic particles doped in Fe49.5Mn30Co10Cr10X0.5 (X=B4C, ZrC and TiC) high-entropy alloy composites are prepared by using arc melting technology, and the effects of three carbide ceramic particles on the microstructure and mechanical properties of composite materials were systematically studied. The results show that the doped carbide ceramic particles can refine the matrix grains, stabilize the fcc phase, and inhibit the formation of the hcp phase. Among them, B4C ceramic particles have the most significant effect on refining grains and stabilizing fcc phase. The mechanical properties of the samples doped with ZrC and B4C ceramic particles are lower than the matrix samples, which is attributed to the poor bonding between the ceramic particles and the matrix, and the appearing void defects at the interface. But TiC doped sample, the strengthening and toughening effect is significant, which is attributed to good interface bonding, fine grain strengthening, Orowan strengthening, and load bearing strengthening.
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图 4 Fe50Mn30Co10Cr10、Fe50Mn30Co10Cr10(B4C)0.5、Fe50Mn30Co10Cr10(ZrC)0.5和Fe50Mn30Co10Cr10(TiC)0.5 4种均匀态样品的EBSD图:((a1)~(d1)) 反极图;((a2)~(d2)) 相图;((a3)~(d3)) 晶界图
ND—Normal direction; RD—Rolling direction; LAB—Low angle boundary; HAB—High angle boundary; θ—Misorientation angle; TB—Twin boundary; PB—Phase boundary; fcc—Face center cubic; hcp—Hexagonal close packed
Figure 4. EBSD maps of four homogeneous samples, including Fe50Mn30Co10Cr10, Fe50Mn30Co10Cr10(B4C)0.5, Fe50Mn30Co10Cr10(ZrC)0.5 and Fe50Mn30Co10Cr10(TiC)0.5: ((a1)-(d1)) Reverse pole figure; ((a2)-(d2)) Phase map; ((a3)-(d3)) Grain boundary map
图 5 Fe50Mn30Co10Cr10、Fe50Mn30Co10Cr10(B4C)0.5、Fe50Mn30Co10Cr10(ZrC)0.5和Fe50Mn30Co10Cr10(TiC)0.5 4种再结晶态样品的EBSD图:((a1)~(d1))反极图;((a2)~(d2))相图;((a3)~(d3))晶界图
Figure 5. EBSD maps of four recrystallized samples, including Fe50Mn30Co10Cr10, Fe50Mn30Co10Cr10(B4C)0.5, Fe50Mn30Co10Cr10(ZrC)0.5 and Fe50Mn30Co10Cr10(TiC)0.5: ((a1)-(d1)) Reverse pole map; ((a2)-(d2)) Phase map; ((a3)-(d3)) Grain boundary map
图 6 再结晶态样品的ECC图:((a1), (a2)) Fe50Mn30Co10Cr10;((b1), (b2)) Fe50Mn30Co10Cr10(B4C)0.5;((c1), (c2)) Fe50Mn30Co10Cr10(ZrC)0.5;((d1), (d2)) Fe50Mn30Co10Cr10(TiC)0.5
Figure 6. ECC maps of recrystallized samples: ((a1), (a2)) Fe50Mn30Co10Cr10; ((b1), (b2)) Fe50Mn30Co10Cr10(B4C)0.5; ((c1), (c2)) Fe50Mn30Co10Cr10(ZrC)0.5; ((d1), (d2)) Fe50Mn30Co10Cr10(TiC)0.5
图 7 再结晶态Fe50Mn30Co10Cr10(B4C)0.5样品界面:((a), (b)) B4C陶瓷颗粒与Fe50Mn30Co10Cr10结合的界面 SEM 图像;((c), (d)) SEM-EDS元素线扫描和面扫描图
Figure 7. Interface images of as-recrystallized Fe50Mn30Co10Cr10(B4C)0.5: ((a), (b)) SEM images of the interface between B4C ceramic particles and Fe50Mn30Co10Cr10; ((c), (d)) SEM-EDS element line scan and surface scan images
图 8 再结晶态Fe50Mn30Co10Cr10(ZrC)0.5样品界面:((a), (b)) ZrC陶瓷颗粒与Fe50Mn30Co10Cr10结合的界面 SEM 图像;((c), (d)) SEM-EDS元素线扫描和面扫描图
Figure 8. Interface images of as-recrystallized Fe50Mn30Co10Cr10(ZrC)0.5: ((a), (b)) SEM images of the interface between ZrC ceramic particles and Fe50Mn30Co10Cr10; ((c), (d)) SEM-EDS element line scan and surface scan images
图 9 再结晶态Fe50Mn30Co10Cr10(TiC)0.5样品界面:((a), (b)) TiC陶瓷颗粒与Fe50Mn30Co10Cr10结合的界面SEM图像;((c), (d)) SEM-EDS元素线扫描和面扫描图
Figure 9. Interface images of as-recrystallized Fe50Mn30Co10Cr10(TiC)0.5: ((a), (b)) SEM images of the interface between TiC ceramic particles and Fe50Mn30Co10Cr10; ((c), (d)) SEM-EDS element line scan and surface scan images
图 10 (a)工程应力-应变曲线[28];(b)加工硬化曲线;样品的断口形貌:(c) Fe50Mn30Co10Cr10;(d) Fe50Mn30Co10Cr10(B4C)0.5;(e) Fe50Mn30Co10Cr10(ZrC)0.5;(f) Fe50Mn30Co10Cr10(TiC)0.5
Figure 10. (a) Engineering stress-strain curves[28]; (b) Work hardening curves; Fracture morphologies of the samples: (c) Fe50Mn30Co10Cr10; (d) Fe50Mn30Co10Cr10(B4C)0.5; (e) Fe50Mn30Co10Cr10(ZrC)0.5; (f) Fe50Mn30Co10Cr10(TiC)0.5
表 1 粉末的基本参数
Table 1. Basic parameters of powder
Powder Particle size/μm Purity/wt% Fe 0.5 99.9 Mn 0.5 99.9 Co 0.5 99.9 Cr 0.5 99.9 B4C 0.04 99.9 ZrC 0.04 99.9 TiC 0.04 99.9 表 2 Fe50Mn30Co10Cr10、Fe50Mn30Co10Cr10(B4C)0.5、Fe50Mn30Co10Cr10(ZrC)0.5和Fe50Mn30Co10Cr10(TiC)0.54种再结晶态样品的力学性能
Table 2. Mechanical properties of four recrystallized samples of Fe50Mn30Co10Cr10, Fe50Mn30Co10Cr10(B4C)0.5, Fe50Mn30Co10Cr10(ZrC)0.5 and Fe50Mn30Co10Cr10(TiC)0.5
Sample Yield stress/MPa Ultimate tensile strength/MPa Fracture elongation/% Fe50Mn30Co10Cr10 206 747 44 Fe50Mn30Co10Cr10(B4C)0.5 441 837 22 Fe50Mn30Co10Cr10(ZrC)0.5 169 473 19 Fe50Mn30Co10Cr10(TiC)0.5 386 886 47 -
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