Influence of loading direction on mechanical properties of magnesium alloy at high strain rate
Abstract：In order to investigate the anisotropy of dynamic mechanical behavior at high strain rate for AZ31B magnesium alloy,the impact compressive tests for the AZ31B magnesium alloy processed respectively along the extrusion direction（ED）,normal direction（ND） and transverse direction（TD） were carried out with split Hopkinson pressure bar in the strain rate range of 1058 to 2500s-1.In addition,the morphologies of compressive fracture surface were observed by scanning electron microscopy（SEM）.The results show that the AZ31B magnesium alloy along both extrusion direction（ED） and normal direction（ND） exhibits significant strain hardening.However,the stress of the AZ31B magnesium alloy along the transverse direction（TD） is not sensitive to strain rate.With increasing the strain rate,the change in the differential values between yield strength and maximum stress is different for the AZ31B magnesium alloy along different loading direction.The differential values show the maximum change along the normal direction（ND） and the minimum change along the transverse direction（TD）.The fracture morphology observation reveals that at high strain rate,the fracture modes of the AZ31B magnesium alloy along different loading direction are all cleavage fracture.
Keywords：magnesium alloyhigh strain rateloading directionsplit Hopkinson pressure bar（SHPB）strain hardeningyield strengthmaximum stresscleavage fracture
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)