Effect of Silicon Addition on Microstructure, Hardness and Young’s Modulus of Injection Molded AZ91D Alloy

Abstract

Magnesium chips were coated with silicon powder using a binder, and injection molding was performed using silicon-coated chips as the raw material. Microstructural analysis of the products revealed that all added silicon (Si) precipitated as Mg₂Si particles, with no voids present at the interfaces between the Mg₂Si particles and the matrix. Furthermore, the hardness and Young’s modulus of the products increased with higher Si content. The Young’s moduli followed the rules of mixtures.

 

This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 87 (2023) 186–191. Abstract and keywords were slightly modified. The captions of Fig. 3, Fig. 4, and Fig. 6 are slightly modified.

Fig. 8 Effect of Si addition on Young’s modulus with the rules of mixtures (Parallel model, Series model and Mori-Tanaka model).