Strength and Energy Absorption Capability of Porous Magnesium Composites Reinforced by Carbon Nanofibers

摘要

Porous magnesium-carbon nanofiber (CNF) composites were manufactured to investigate the variation of compressive mechanical properties with the change of porosity and CNF concentration. When the CNF concentration changed from 0% to 2%, the average yield strength significantly increased for the porous composites with the porosity of either 24%, 34%, or 50%. The yield strength and the ultimate compressive strength decreased at an increasing rate with the increase of porosity. For each studied porosity, the addition of CNF to porous magnesium composite samples increased energy absorption capability when the samples underwent any given strain level. Four theoretical strengthening models were utilized to estimate yield strength of the studied porous composites and the results indicated that the shear lag model and the rule of mixture model provided better yield strength estimations than the Strengthening factor model and the Zhang & Chen model.