Pub Date : 2023-11-15DOI: 10.1080/2374068x.2023.2280295
Rudreshkumar Makwana, Bharat Modi, Kaushik Patel
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Pub Date : 2023-10-02DOI: 10.1080/2374068X.2022.2145041
Ramesh Manjunath, Deepak Kumar, Ajay Kumar
ABSTRACT Impact of age hardening and incorporation of graphite particles reinforcements on fatigue properties of Aluminum metal matrix composites which were fabricated with liquid metallurgical method is explored in this paper. Fabricated fatigue testing specimens were age hardened at temp of 170 °C and 270 °C to improve fatigue strength. Both aged and ascast specimens were characterized to study fatigue properties at operating temperature.Ggraphite particulate and age hardening temperature influences the fatigue strength of composites owing to its higher fatigue life compaed with as cast condition and age hardening at 270 °C. The incorporation of graphite exhibited remarkable improvement in fatigue strength. The detailed study of fractured surfaces of composites under microscope revealed its failure mechanism. It is found that , hardness increased with aging temperature up to 170 °C, beyond which found to be decreased resulted in formation of precipitation near the grain boundaries and enhanced the hardness of composites. But at 270 °C, both precipitate and grain boundaries abrading reduces both strength and hardness of composite. EDS analysis of composites at different phases for particles and interface between matrix and graphite particles is shown rich phase in aluminium matrix and poor at the interface.
摘要 本文探讨了采用液态冶金方法制造的铝金属基复合材料的时效硬化和石墨颗粒增强对其疲劳性能的影响。制作的疲劳测试试样在 170 °C 和 270 °C 温度下进行了时效硬化，以提高疲劳强度。石墨颗粒和时效硬化温度会影响复合材料的疲劳强度，因为在铸造状态和 270 °C 时效硬化条件下，复合材料的疲劳寿命更高。石墨的加入显著提高了疲劳强度。显微镜下对复合材料断裂表面的详细研究揭示了其失效机理。研究发现，在 170 ℃ 以下，硬度随老化温度的升高而升高，超过 170 ℃ 后，硬度降低，这是因为在晶界附近形成了沉淀，从而提高了复合材料的硬度。但在 270 °C 时，析出物和晶界磨损都会降低复合材料的强度和硬度。对复合材料颗粒以及基体和石墨颗粒之间界面的不同相位进行的 EDS 分析表明，铝基体中的相位丰富，而界面上的相位贫乏。
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