温度对火花等离子烧结制造的 TiC/Fe 基复合材料微观结构和机械性能的影响

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-18 DOI:10.1016/j.jmrt.2024.09.121
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引用次数: 0

摘要

我们系统地研究了烧结温度对碳化钛颗粒增强铁基复合材料(TiC/Fe MCs)微观结构和机械性能的影响。扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、电子背散射衍射仪 (EBSD) 和能量色散光谱仪 (EDS) 对微观结构进行了分析。结果表明,随着烧结温度的升高,复合材料的孔隙率先减小后增大。同时,晶粒尺寸逐渐减小,元素扩散变得更加均匀。当达到临界烧结温度(1120 °C)时,原始晶粒尺寸消失,碳化物经过分解和再沉淀达到平衡状态,从而实现最佳的综合性能(孔隙率降至最低 3.85%,晶粒尺寸为 2.69 μm,维氏硬度达到 595 HV0.5,抗弯强度为 662 MPa,摩擦系数为 0.74,磨损失效为 0.21 mg)。这些性能的提高归因于复合材料中孔隙率的降低、晶粒尺寸的减小以及碳化物在基体中锚定效果的改善。此外,还分析了不同工艺参数下 TiC/Fe MCs 的主要断裂机制和磨损机制。当温度低于 1080 ℃ 时,晶间断裂占主导地位,而当温度高于这一临界值时,跨晶断裂和韧性断裂占主导地位。当温度低于 1120 ℃ 时,主要观察到疲劳磨损、氧化磨损和磨料磨损。相反,当温度超过 1120 ℃ 时,氧化磨损和磨料磨损成为主要机理。
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Effect of temperature on the microstructure and mechanical properties of TiC/Fe matrix composites fabricated by spark plasma sintering

The effects of sintering temperatures on the microstructures and mechanical properties of titanium carbide particles reinforced iron matrix composites (TiC/Fe MCs) fabricated by the spark plasma sintering (SPS) process with pure element powders have been systematically investigated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back scattering diffractometer (EBSD), and energy dispersive spectroscopy (EDS) have been conducted for microstructural analysis. The results show that with increasing sintering temperatures, the porosity of the composites initially decreases and then increases. Simultaneously, the grain size gradually diminishes while element diffusion becomes more uniform. Upon reaching a critical sintering temperature (1120 °C), the original grain size disappears and carbides undergo decomposition and reprecipitation to reach an equilibrium state, with which optimal comprehensive properties can be achieved (porosity decreases to a minimum of 3.85%, grain size of 2.69 μm, Vickers hardness reaches 595 HV0.5, bending strength is at 662 MPa, coefficient of friction is at 0.74, and wear loss to 0.21 mg). These property enhancements have been attributed to reduced porosity in the composites, decreased grain size, and improved anchoring effect of carbides within the matrix. Additionally, the primary fracture mechanisms and wear mechanisms of TiC/Fe MCs with different process parameters have been analyzed. When the temperature is below 1080 °C, intergranular fracture predominates, whereas transgranular and ductile fractures become predominant above this threshold. When the temperature is below 1120 °C, fatigue wear, oxidation wear, and abrasive wear are predominantly observed. Conversely, when the temperature exceeds 1120 °C, oxidation wear and abrasive wear become the primary mechanisms.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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