In contrast to conventional casting, casting using in situ microwave route is an advanced and promising technique of bulk metal casting wherein bulk metal is heated and melted in microwave radiations at 2.45 GHz. In this present work, AA-6063 is used as a charge material at three microwave powers of 600 W, 750 W and 900 W. The process uses three susceptor materials—stone charcoal, wood charcoal and SiC—and solidification is done at two levels as closed and open cavity. The optimization of the process parameters has been done through Taguchi technique. Microstructure and microindentation hardness studies of the developed casts divulged that smaller equiaxed grains could be obtained in densely cast samples 15 and 9. In these cast samples, the presence of intermetallic phases of Al₂Mg_3, MgZn₂, Mg₂Si, Al₂Mg was observed; however, the cast sample 18 contains intermetallic phases of Al₂Mg, MgZn and Al₂Mg₃. It was found from this work that the grain structure and intermetallic precipitates in the developed cast depend primarily on solidification environment, microwave power and susceptors. Microindentation hardness of the cast sample 18 in the present study was about 166 HV that is higher than the other developed casts. The characterization of developed casts in terms of microstructure, elemental analysis, porosity, XRD and fractography is analyzed. The results reveal that the rapid solidification and increased microwave power alter elemental composition, distribution and size of eutectic phases resulting in increase in the microindentation hardness.

与传统铸造相比，使用原位微波途径铸造是一种先进且有前景的大块金属铸造技术，其中大块金属在 2.45 GHz 的微波辐射中加热和熔化。在目前的工作中，AA-6063 被用作三种微波功率（600 W、750 W 和 900 W）的充电材料。该过程使用三种感受器材料——石炭、木炭和 SiC——并在两个层面进行固化作为封闭和开放的腔体。工艺参数的优化是通过田口技术完成的。已开发铸件的显微组织和显微压痕硬度研究表明，在致密铸造样品 15 和 9 中可以获得更小的等轴晶粒。在这些铸造样品中，存在 Al ₂ Mg _3、观察到MgZn ₂、Mg ₂ Si、Al ₂ Mg；然而，铸造样品18包含Al ₂ Mg、MgZn和Al ₂ Mg _{3 的}金属间相. 从这项工作中发现，发达铸件中的晶粒结构和金属间化合物沉淀主要取决于凝固环境、微波功率和感受器。本研究中铸件样品 18 的显微压痕硬度约为 166 HV，高于其他开发的铸件。分析了已开发铸件的微观结构、元素分析、孔隙率、XRD 和断口分析的表征。结果表明，快速凝固和增加的微波功率改变了共晶相的元素组成、分布和尺寸，导致显微压痕硬度增加。