ABSTRACT An attempt has been made to correlate the mechanical properties with microstructure and machining performance of zirconia toughened alumina composite fabricated from different ratios of Al2O3 with yttria stabilized zirconia (YSZ) powder. The developed 3 mol% YSZ powder has been mixed with Al2O3 in the ratios of 10:90, 15:85 and 20:80 for fabrication of cutting inserts. Study reveals the relation between microstructure of the composites with the mechanical properties, i.e. hardness, fracture toughness, flexural strength. Conventional lathe NH-26 is used to evaluate the machining performance, i.e. flank wear, surface roughness and cutting force of all three types of developed inserts by machining of AISI 4340 steel bar. The maximum hardness, 15.55 GPa, has been obtained for 90% Al2O3 with 10% YSZ. The maximum values of fracture toughness (5.96 MPa.m1/2) and flexural strength (510 MPa) are noticed for 80% Al2O3 with 20% YSZ. The analysis also shows that when the YSZ percentage increases, the smaller grain size of YSZ particle and crack bridging phenomena enhances the mechanical properties like fracture toughness and flexural strength of the composites. The composition comprising of YSZ:Al2O3::10:90 shows less flank wear, best surface finish and lowest cutting force. GRAPHICAL ABSTRACT

中文翻译：

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YSZ/Al2O3陶瓷显微组织与力学性能的相关性及其对钢高速加工的影响

摘要 尝试将不同比例的 Al2O3 与氧化钇稳定氧化锆 (YSZ) 粉末制成的氧化锆增韧氧化铝复合材料的机械性能与微观结构和加工性能相关联。开发的 3 mol% YSZ 粉末与 Al2O3 以 10:90、15:85 和 20:80 的比例混合，用于制造切削刀片。研究揭示了复合材料的微观结构与力学性能，即硬度、断裂韧性、弯曲强度之间的关系。常规车床NH-26用于通过加工AISI 4340钢筋来评估所有三种开发刀片的加工性能，即后刀面磨损、表面粗糙度和切削力。90% Al2O3 和 10% YSZ 的最大硬度为 15.55 GPa。断裂韧度的最大值 (5. 96 MPa.m1/2) 和弯曲强度 (510 MPa) 被注意到 80% Al2O3 和 20% YSZ。分析还表明，当 YSZ 百分比增加时，YSZ 颗粒的较小晶粒尺寸和裂纹桥接现象增强了复合材料的断裂韧性和弯曲强度等力学性能。由 YSZ:Al2O3::10:90 组成的成分显示出较小的后刀面磨损、最佳表面光洁度和最低切削力。图形概要 最好的表面光洁度和最低的切削力。图形概要 最好的表面光洁度和最低的切削力。图形概要