Enhancing microstructure, nanomechanical and tribological properties of TiAl alloy processed by spark plasma sintering with Si3N4 ceramic particulates addition

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2024-11-01 DOI:10.1016/j.matchemphys.2024.130113

Azeez Lawan Rominiyi , Peter Madindwa Mashinini , Moipone Linda Teffo

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Abstract

TiAl matrix composites reinforced with varying weight fractions of Si₃N₄ ceramic particles were successfully fabricated by the spark plasma sintering method. The microstructure, nanomechanical and tribological properties of the sintered composites were investigated. The microstructural characterization revealed the evolution of a quasi-continuous and continuous network structure consisting of minor fractions of in-situ formed Ti₂AlN, unreacted Si₃N₄ ceramic particles and dominant Ti₅Si₃ intermetallic phases within the TiAl matrix at Si₃N₄ content above 1.5 wt%. The in-situ precipitated phases enhanced the nanomechanical and tribological properties of the composites. The 7Si₃N₄/TiAl composite displayed the best nanomechanical properties, including nanohardness, elastic modulus, and H/E_r ratio among the sintered samples. The specific wear rate of the composites decreases with increasing reinforcement content. 7Si₃N₄/TiAl composite exhibited the lowest specific wear rate of 0.38 ± 0.55

\times

10⁻⁴ mm³/Nm, representing a 95.6 % improvement in wear resistance compared to the unreinforced pure TiAl alloy. The improved wear performance of the composites was attributed to their load-bearing capacity and wear resistance of the hard, in-situ Ti₂AlN, Ti₅Si₃ and unreacted Si₃N₄ particles in the TiAl matrix. The composites displayed a transition from adhesive wear to predominantly abrasive wear where the hard Si₃N₄ particles prevented direct metal-to-metal contact and facilitated the formation of a protective tribolayer, resulting in enhanced wear resistance. Hence, the developed Si₃N₄/TiAl composites are suitable for various structural and tribological applications.

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通过添加 Si3N4 陶瓷颗粒的火花等离子烧结工艺提高 TiAl 合金的微观结构、纳米力学和摩擦学性能

采用火花等离子烧结法成功地制造出了用不同重量分数的 Si3N4 陶瓷颗粒增强的 TiAl 基复合材料。研究了烧结复合材料的微观结构、纳米力学性能和摩擦学性能。微观结构表征显示，当 Si3N4 含量超过 1.5 wt% 时，TiAl 基体中出现了准连续和连续的网络结构，其中包括少量原位形成的 Ti2AlN、未反应的 Si3N4 陶瓷颗粒和主要的 Ti5Si3 金属间相。原位析出相增强了复合材料的纳米力学性能和摩擦学性能。在烧结样品中，7Si3N4/TiAl 复合材料显示出最佳的纳米力学性能，包括纳米硬度、弹性模量和 H/Er 比。复合材料的比磨损率随着增强成分的增加而降低。7Si3N4/TiAl 复合材料的比磨损率最低，为 0.38 ± 0.55 × 10-4 mm3/Nm，与未增强的纯 TiAl 合金相比，耐磨性提高了 95.6%。复合材料耐磨性能的提高归功于其承载能力和 TiAl 基体中坚硬的原位 Ti2AlN、Ti5Si3 和未反应的 Si3N4 颗粒的耐磨性。复合材料显示出从粘着磨损向主要是磨料磨损的过渡，其中坚硬的 Si3N4 颗粒阻止了金属与金属之间的直接接触，促进了保护摩擦层的形成，从而增强了耐磨性。因此，所开发的 Si3N4/TiAl 复合材料适用于各种结构和摩擦学应用。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.