Salifu Smith, Olubambi Peter Apata, Teffo Linda
Centre for Nanoengineering and Advanced Materials, University of Johannesburg, South Africa.
Institute for Nanoengineering Research, Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa.
Heliyon. 2024 Jan 14;10(2):e24498. doi: 10.1016/j.heliyon.2024.e24498. eCollection 2024 Jan 30.
Spark plasma sintering (SPS) technique was employed in the consolidation of CrMnNiCuNbCo high entropy alloy (HEA) reinforced aluminium matrix composites. Phase stability and prediction expressions were used in the determination of the powder combination for the HEA. The microstructural analysis showed that an interdiffusion layer was formed between the aluminium matrix and the HEA particles in the sintered composites. Further investigation of the composites by X-ray diffraction (XRD) showed that in addition to the Al matrix phase present, other new phases (BCC, FCC and other intermetallics) were formed as a result of the reaction between the Al matrix and the atoms precipitated from the added HEA during sintering. The density of the HEA-reinforced Al matrix composites decreases with an increase in the wt.% of HEA from 98.6 % for pure aluminium to 98.1 % for the reinforced alloy with 10 % HEA, while the microhardness increases with an increase in the wt.% of the HEA from 35 HV for pure aluminium to 96.0 HV for the alloy reinforced with 10 % HEA.
采用放电等离子烧结（SPS）技术对CrMnNiCuNbCo高熵合金（HEA）增强铝基复合材料进行固结。利用相稳定性和预测表达式来确定高熵合金的粉末组合。微观结构分析表明，在烧结复合材料的铝基体与高熵合金颗粒之间形成了一个互扩散层。通过X射线衍射（XRD）对复合材料进行的进一步研究表明，除了存在的铝基体相之外，由于铝基体与烧结过程中从添加的高熵合金中析出的原子之间发生反应，还形成了其他新相（体心立方、面心立方和其他金属间化合物）。高熵合金增强铝基复合材料的密度随着高熵合金重量百分比的增加而降低，从纯铝的98.6%降至含10%高熵合金的增强合金的98.1%，而显微硬度则随着高熵合金重量百分比的增加而增加，从纯铝的35 HV增至含10%高熵合金的合金的 96.0 HV。
