On the synthesis and sintering behavior of a novel Mg-Ca alloy, Part II: Spark plasma sintering

With the growing interest in lightweight materials, magnesium and its alloys have received substantial attention for replacing existing alloys. After investigating the mechanical alloying process of Mg-Ca alloys and determining the optimum parameters for milling in part I of this study, the current research aims to examine the second step: the sintering process. This study proposes the powder metallurgy method to process Mg-Ca alloy through the spark plasma sintering technique at ۴۲۰ °C under an applied pressure of ۳۸ MPa. Samples with different additives (starch or paraffin) were sintered for various dwell times (۷ and ۱۰ min) to determine the optimal mechanical and physical properties. To study the microstructure and phase composition of the sintered alloys, X-ray diffractometer (XRD), field scanning electron microscopy (FESEM), and X-ray energy dispersive spectroscopy (EDS) were utilized. Density measurement, compression test, and micro-hardness evaluation were also conducted for the physical and mechanical feathers analysis. The results indicated that samples with a dwell time of ۱۰ min exhibited superior mechanical properties. Additionally, the starch-containing sample outperformed the paraffin-containing sample in both physical and mechanical properties.With the growing interest in lightweight materials, magnesium and its alloys have received substantial attention for replacing existing alloys. After investigating the mechanical alloying process of Mg-Ca alloys and determining the optimum parameters for milling in part I of this study, the current research aims to examine the second step: the sintering process. This study proposes the powder metallurgy method to process Mg-Ca alloy through the spark plasma sintering technique at ۴۲۰ °C under an applied pressure of ۳۸ MPa. Samples with different additives (starch or paraffin) were sintered for various dwell times (۷ and ۱۰ min) to determine the optimal mechanical and physical properties. To study the microstructure and phase composition of the sintered alloys, X-ray diffractometer (XRD), field scanning electron microscopy (FESEM), and X-ray energy dispersive spectroscopy (EDS) were utilized. Density measurement, compression test, and micro-hardness evaluation were also conducted for the physical and mechanical feathers analysis. The results indicated that samples with a dwell time of ۱۰ min exhibited superior mechanical properties. Additionally, the starch-containing sample outperformed the paraffin-containing sample in both physical and mechanical properties.

کلیدواژه ها:

Spark plasma sintering ، Magnesium ، Powder metallurgy ، Grain boundary ، Strengthening ، Solid solution strengthening