Effect of MgO Content on Mechanical Properties of Directionally Solidified Pure Magnesium

Abstract

The pure magnesium was fabricated by directional solidification, and the effect of the distribution characteristics of magnesium oxide (MgO) on the mechanical properties of pure magnesium was investigated. The statistical results showed that the area fraction, number and size of MgO were decreased gradually from the top region ingot to the bottom region ingot, and these reflected the advantages of directional solidification technology in the controllability of MgO distribution characteristics. The top parts of magnesium ingots have the highest tensile strength (44 MPa), which is mainly due to the presence of a large amount of the coarse MgO. Though the coarse MgO increases the strength obviously, it has harm for the ductility of magnesium. The top parts of magnesium ingots have higher ultimate tensile strength, but lower failure strain (13% and-21% respectively) than the ingot at the center. These results indicate that if the suitable size and amount of MgO existed in magnesium matrix, it could avoid the disadvantages of MgO and provide positive effect for both the strength and ductility of magnesium alloys.

STUDY TO MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Mg-Zn-Fe-Cu-Co AS HIGH ENTROPY ALLOYS FOR URETERAL IMPLANT APPLICATION

“…Based on equations 2 and 3, there is a relationship between enthalpy and δ. The value of δ increases as the enthalpy value decreases [26]- [27]. Thus, the HEA alloy will form a metallic glass alloy with an unstable structure [26], [28].…”

“…The value of δ increases as the enthalpy value decreases [26]- [27]. Thus, the HEA alloy will form a metallic glass alloy with an unstable structure [26], [28]. In this case, the 50 Mg and 70 Mg alloys are characterized by the predominant formation of the intermetallic phase.…”

“…MgO differs from other combining elements in that MgO was formed at the grain boundaries, whereas MgO is uniformly distributed in the Mg matrix. The presence of MgO can increase the hardness of magnesium and can also stimulate the formation of pores on the surface of Mg which is very useful for implant applications that can be damaged [26].…”

Morphology Design and Fabrication of Bio-Inspired Nano-MgO–Mg(OH)2 via Vapor Steaming to Enable Bulk CO2 Diffusion and Capture

“…Magnesium oxide (MgO) and magnesium hydroxide (Mg(OH) 2 ) are two of the most environmentally friendly materials when compared to other materials [3][4][5]. For properties such as flame resistance, dielectric resistance, and mechanical strength; and micro structural properties such as porosity, large surface area catalysis, acid-base sites, and gas adsorption, MgO is well received in industrial applications such as ceramics, cement, and water treatments [2,[5][6][7][8][9][10][11]. At intermediate temperatures, CO 2 absorbents based on MgO have been identified as promising.…”