ABSTRACT Composite material via hybrid casting techniques. Ball-milling of Si3N4 and MgO powder was carried out for 100 hours to obtain in single entity particles. MgO powder is used to enhance wettability property of composite with Si3N4 reinforcement in AA2024 aluminium alloy. However, MgO was also responsible to improve tensile strength and hardness of composite material. Microstructure results showed the fair distribution of reinforcement particles developed by the hybrid casting technique. Maximum tensile strength and hardness were found to be 219.55 MPa and 80.86 BHN for ball-milled AA2024/7.5 % Si3N4/5% MgO composite material as heat treated. Minimum thermal expansion was also found for composition AA2024/7.5% Si3N4/5% MgO composite. However, minimum corrosion loss was observed for composition AA2024/10% Si3N4/2.5% MgO composite material. Though, toughness and ductility were reduced by adding the Si3N4 and MgO particles in AA2024 aluminium alloy. XRD result showed the presence of SiO2, Mg, Al, Si3N4, Cu and MgO in ball-milled AA2024/7.5% Si3N4/5% MgO composite material.

中文翻译：

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添加球磨MgO和Si3N4对混合铸造技术开发的铝基复合材料物理、机械和热性能的影响

摘要 通过混合铸造技术制成的复合材料。将 Si3N4 和 MgO 粉末球磨 100 小时以获得单一实体颗粒。MgO粉末用于提高AA2024铝合金中Si3N4增强复合材料的润湿性能。然而，MgO 也有助于提高复合材料的拉伸强度和硬度。微观结构结果表明，通过混合铸造技术开发的增强颗粒分布均匀。经球磨处理的 AA2024/7.5% Si3N4/5% MgO 复合材料的最大拉伸强度和硬度为 219.55 MPa 和 80.86 BHN。还发现组合物 AA2024/7.5% Si3N4/5% MgO 复合材料的热膨胀最小。然而，对于成分为 AA2024/10% Si3N4/2.5% MgO 的复合材料，观察到最小腐蚀损失。然而，在AA2024铝合金中加入Si3N4和MgO颗粒会降低韧性和延展性。XRD 结果表明球磨后的 AA2024/7.5% Si3N4/5% MgO 复合材料中存在 SiO2、Mg、Al、Si3N4、Cu 和 MgO。