This paper has been focused on the porosity, hardness, tensile and abrasion wear of Mg-based B4C composites developed by squeezed vacuum-based stir casting (SVSC) process by adding 3, 5, 7, 9 wt. % of B4C. Also, an electromagnetic stir casting has been used to synthesize similar composition specimens in comparison to the SVSC results. Additionally, electron microscopy has been used for analyzing the micro structural, fractographic and worn images of Mg-based B4C composites and to validate appropriate fabrication method. A tribo-test has been carried out by two-body abrasion condition at 20N and 30N load for as sliding distance of 100m and 5m/s of speed. The results reveal that the SVSC process produces homogeneously distributed B4C particles in Mg-matrix as compared to the electromagnetic stirring. The mechanical properties of Mg/B4C composites show their significant enhancement with the addition of B4C content in Mg-matrix. B4C composites show an increment of 33-48% of hardness as compared to Mg-matrix. Mg-matrix having 9 wt. % of B4C composite reveals the least tensile strength and fractured images show the cleavage planes, micro voids as well as micro cracks. Although, worn images shows oxidation and ploughing mechanism with the increase in load and depth of penetration in Mg-matrix B4C composites.

中文翻译：

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B4C对两步搅拌铸造镁基复合材料显微组织、力学和磨损性能的影响

本文重点研究了通过挤压真空搅拌铸造 (SVSC) 工艺开发的镁基 B4C 复合材料的孔隙率、硬度、拉伸和磨损磨损。B4C 的百分比。此外，与 SVSC 结果相比，电磁搅拌铸造已被用于合成类似成分的试样。此外，电子显微镜已被用于分析镁基 B4C 复合材料的微观结构、断口和磨损图像，并验证适当的制造方法。在20N和30N载荷下，以100m的滑动距离和5m/s的速度进行了双体磨损条件下的摩擦试验。结果表明，与电磁搅拌相比，SVSC 工艺在镁基体中产生均匀分布的 B4C 颗粒。Mg/B4C复合材料的力学性能随着Mg基体中B4C含量的增加而显着提高。与镁基体相比，B4C 复合材料的硬度增加了 33-48%。镁基体具有 9 重量。B4C 复合材料的 % 显示出最低的拉伸强度，断裂图像显示了解理面、微孔洞以及微裂纹。虽然磨损的图像显示了氧化和耕作机制，随着负载和渗透深度的增加，镁基 B4C 复合材料。