Microstructure, hardness, and wear properties of hot-press sintered Cr3C2/Ni3Al composites containing Cr3C2 particles of different sizes

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-09-19 DOI:10.1016/j.intermet.2024.108503

Lihua Fu , Meng Zhou , Yuanan Gao , Bin Gan , Sanming Du , Yongzhen Zhang , Chenfei Song , Lvdong Hua , Guofeng Zhang

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Abstract

In this study, Cr₃C₂/Ni₃Al composites containing Cr₃C₂ particles of different sizes were prepared via hot-press sintering. Subsequently, the effects of the size of the added Cr₃C₂ particles on the microstructure, hardness, and tribological properties of the Cr₃C₂/Ni₃Al composites were investigated. The results showed that the Ni₃Al powder and Cr₃C₂ particles in the composites exhibited obvious interdiffusion interactions during the hot-press sintering process and formed a new diffusion phase with an M₇C₃ (M = Cr, Fe, and Ni) structure in the Cr₃C₂/Ni₃Al composites. In addition, the diffusion effect in the composites with small Cr₃C₂ particles was full, the proportion of the M₇C₃ (M = Cr, Fe, and Ni) diffusion phase in the composites was greater, and the solid-solution strengthening effect of the matrix phase was evident. The hardness of the Cr₃C₂/Ni₃Al composites was noticeably higher than that of the Ni₃Al alloy because of the combination of particle, solid-solution, and refined crystalline strengthening effects. The composite with 5 μm Cr₃C₂ particles displayed the maximum hardness (56.3 HRC) and best wear resistance. The wear mechanism results indicated that the carbide particles in the composites improved the hardness, carried the load, and blocked the movement of abrasive particles, effectively protecting the matrix from wear. However, when the added Cr₃C₂ particles were too large, the weak interfacial bond between the chromium carbides and the matrix phases in the composites allowed the chromium carbides to easily crack and fall off, which decreased the wear resistance.

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含有不同尺寸 Cr3C2 颗粒的热压烧结 Cr3C2/Ni3Al 复合材料的微观结构、硬度和磨损性能

本研究通过热压烧结法制备了含有不同尺寸 Cr3C2 颗粒的 Cr3C2/Ni3Al 复合材料。随后，研究了添加的 Cr3C2 颗粒大小对 Cr3C2/Ni3Al 复合材料的微观结构、硬度和摩擦学性能的影响。结果表明，复合材料中的 Ni3Al 粉末和 Cr3C2 颗粒在热压烧结过程中表现出明显的相互扩散作用，并在 Cr3C2/Ni3Al 复合材料中形成了具有 M7C3（M = Cr、Fe 和 Ni）结构的新扩散相。此外，Cr3C2 颗粒较小的复合材料中扩散效应充分，复合材料中 M7C3（M = Cr、Fe 和 Ni）扩散相的比例较大，基体相的固溶强化效应明显。由于粒子、固溶和细晶强化效应的共同作用，Cr3C2/Ni3Al 复合材料的硬度明显高于 Ni3Al 合金。含有 5 μm Cr3C2 颗粒的复合材料显示出最大硬度（56.3 HRC）和最佳耐磨性。磨损机理结果表明，复合材料中的碳化物颗粒提高了硬度，承载了负荷，并阻止了磨料颗粒的运动，有效地保护了基体免受磨损。然而，当添加的 Cr3C2 颗粒过大时，复合材料中铬碳化物与基体相之间的界面结合力较弱，铬碳化物容易开裂和脱落，从而降低了耐磨性。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.