The mechanical properties of Mg2Si containing Mg alloys through the modification of the morphology of Mg2Si particles by Ca or P addition are improved. It shows that the microstructure of squeeze cast Mg-5Al-1Zn-0.7Si alloy contains Chinese script Mg2Si particles. Chinese script type Mg2Si particles acts as crack nucleation sites, resulting in poor mechanical properties in squeeze cast Mg-5Al-1Zn-0.7Si alloy. Addition of Ca or P promotes the formation of fine polygonal type Mg2Si particles by providing the nucleation sites for polygonal type Mg2Si particles. Moreover, the grain size of Ca or P modified Mg-Al-Zn-Si alloys are much finer than that of base alloy.
Bibliographical noteFunding Information:
The authors appreciate the financial support of the Hyundai Motors Company and the Korea Ministry of Science and Technology.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys