Ti6Al4V alloy combines excellent mechanical and chemical characteristics attractive in some important applications in the automotive and aerospace industries but its insufficient hardness and high-temperature oxidation subdue its extensive use. This work was undertaken to modify the microstructure and improve the current limitation of Ti6Al4V alloy with the intention of not affecting its desirable properties. Therefore, the effects of different refractory nitrides: aluminium nitride (AlN), titanium nitride (TiN) and hexagonal boron nitride (h-BN) reinforcements on the microstructure, mechanical, chemical and oxidation properties of spark plasma sintered Ti6Al4V-based binary composites were investigated. Spark plasma sintering technique was effectively utilized to consolidate the Ti6Al4V powder and 3 wt% nanoparticles of AlN, TiN and h-BN respectively. The microstructure and phase composition of the sintered composites were examined by scanning electron microscopy, optical microscopy, and X-ray diffractometry; densification was evaluated according to Archimedes' principle and microhardness was measured by Vickers’ microhardness test. The corrosion and oxidation behaviour of the samples were studied by linear polarization experiment and thermal gravimetric analysis respectively. It was found that the binary composites produced attained almost full theoretical relative densification (98.23–99.54%) due to adequate diffusional mass transport in solidly bonded particles at the matrix-reinforcement interfaces. Ti6Al4V-3h-BN composite gave the optimal combination of relative densification (99.54%) and microhardness (7030 MPa) which exceeds 200% of the monolithic alloy and about 48% superior to both composites with AlN and TiN reinforcements. The yield and ultimate tensile strengths of the matrix were improved by approximately 47% via the AlN and TiN nanoparticle additions and significantly by 116% through the nano-h-BN addition. Ti6Al4V–3AlN demonstrated most superior electrochemical corrosion resistance with a current density of 3.66 μA/cm² and a polarization resistance of 8760.2 Ω in the sulphuric acid medium while Ti6Al4V–3TiN with the least normalized weight gain of 0.85 mg/cm² showed the greatest resistance against oxidation in the high-temperature oxidizing environment.

Ti6Al4V合金具有出色的机械和化学特性，在汽车和航空航天工业的一些重要应用中具有吸引力，但由于硬度不足和高温氧化而被广泛使用。进行这项工作是为了改变Ti6Al4V合金的微观结构并改善其电流限制，目的是不影响其所需的性能。因此，不同耐火氮化物的影响：氮化铝（AlN），氮化钛（TiN）和六方氮化硼（h-BN）增强剂对火花等离子体烧结Ti6Al4V基二元复合材料的微观结构，力学，化学和氧化性能的影响。有效地利用火花等离子体烧结技术来固结Ti6Al4V粉末和3％的AlN，TiN和h纳米颗粒-BN分别。通过扫描电子显微镜，光学显微镜和X射线衍射法检查了烧结复合材料的微观结构和相组成。根据阿基米德原理评估致密性，并通过维氏显微硬度测试测量显微硬度。通过线性极化实验和热重分析分别研究了样品的腐蚀和氧化行为。结果发现，由于在基体-增强界面上的固相结合颗粒中有足够的扩散质量传递，所产生的二元复合材料几乎达到了理论上的相对致密化（98.23–99.54％）。Ti6Al4V-3小时-BN复合材料提供了相对致密化（99.54％）和显微硬度（7030 MPa）的最佳组合，超过了整体合金的200％，比含AlN和TiN增强材料的复合材料优越约48％。通过添加AlN和TiN纳米颗粒，基体的屈服强度和极限抗拉强度提高了约47％，而通过添加纳米h -BN则显着提高了116％。的Ti6Al4V-3AlN证明最优越的电化学耐腐蚀性的3.66μA/ cm 2的电流密度²和8760.2Ω的极化电阻在硫酸介质中而Ti6Al4V表面-3TiN用最少的归一化增益的0.85重量毫克/厘米²显示了最大在高温氧化环境中具有抗氧化性。