Some studies on the thermal-expansion behavior of c-fiber, SiC p , and in-situ Mg2Si-Reinforced AZ31 Mg alloy-Based hybrid composites

Abstract

Magnesium alloy-based hybrid composites with carbon-fiber, SiC p , and in-situ Mg 2 Si reinforcements have been prepared by the squeeze-infiltration technique. The results of the studies done on the measurement of the coefficient of thermal expansion after thermal cycling of these composites show that the thermal cycling initially leads to rapid linear expansion of the composite. However, the expansion becomes stabilized after a few cycles, pointing toward formation of the stable interfaces due to the formation of stable precipitates. The model for the growth kinetics of these precipitates at the interface shows a rapid initial growth of the precipitates with the number of thermal cycles, which becomes saturated after a few thermal cycles. The thermal treatment of the composite lowers the coefficient of linear thermal expansion, which can be explained on the basis of further stabilization of the interfaces after the thermal treatment.

Effects of Sb addition on the modification of Mg2Si particles and high-temperature mechanical properties of cast Mg–4Zn–2Si alloy

“…However, Mg 2 Si compound is prone to form as undesirable coarse Chinese script particles under low solidification rates, which are detrimental to mechanical properties. It has also been reported that the presence of the Mg 2 Si particles with a Chinese-script morphology in Mg-based composites may not be conducive for providing thermal stability, while it is expected that the massive type of Mg 2 Si helps to provide thermal stability, due to its globular shape [10,11]. Therefore, it is of interest to refine the morphology of the coarse Mg 2 Si particles.…”

Some Observations on Microstructural Changes in a Mg-Based AE42 Alloy Subjected to Friction Stir Processing

“…[2][3][4][5][6][7][8][9][10] Poor high-temperature strength and lower elastic modulus are two issues related to magnesium and their alloys that limit their application. [11,12] Although there are several studies on Mg alloy development to overcome these persistent problems, more work is needed in this direction to enhance the strengthening process in the system.…”