Aluminum–silicon alloy reinforced with titanium diboride particles (2 wt.%, 5 wt.%, and 7 wt.%) were successfully synthesized using a stir-casting method. Dipotassium titanium hexafluoride and potassium tetrafluoroborate salts were used to obtain an in situ titanium diboride phase in a molten matrix. These in situ composites have shown significant improvements in their mechanical properties, such as Young’s modulus, yield strength, ultimate tensile strength and micro-hardness compared to the base alloy. X-ray diffraction patterns of the obtained metal matrix composites confirms the formation of titanium diboride particles. The microstructures were studied using field-emission scanning electron microscopy. The in situ-formed titanium diboride particles were found uniformly distributed with good interfacial bonding. Reinforcement particles were predominantly in cubical, spherical, and hexagonal shapes. The fracture surfaces of the composites contained fine dimples, and some microcracks were generated and propagated through cleavage or facet zones.

中文翻译：

---

原位二硼化钛颗粒增强对铝硅基金属基复合材料力学性能的影响

使用搅拌铸造方法成功合成了用二硼化钛颗粒（2 wt.%、5 wt.% 和 7 wt.%）增强的铝硅合金。六氟化二钾钛和四氟硼酸钾盐用于在熔融基质中原位获得二硼化钛相。与基础合金相比，这些原位复合材料在机械性能方面显示出显着改善，例如杨氏模量、屈服强度、极限拉伸强度和显微硬度。所得金属基复合材料的 X 射线衍射图证实了二硼化钛颗粒的形成。使用场发射扫描电子显微镜研究微观结构。发现原位形成的二硼化钛颗粒均匀分布并具有良好的界面结合。增强颗粒主要呈立方体、球形和六边形。复合材料的断裂表面包含细小的凹坑，并且产生了一些微裂纹并通过解理或小平面区域传播。