Evaluation of deep drawability of flame-retardant magnesium alloy sheets

Abstract

The deep drawability of flame-retardant Amca602 magnesium alloy sheets (aluminum, 6.5%; zinc, 0.08%, manganese, 0.32%; calcium, 2.1%) was investigated. Firstly, fundamental mechanical properties were obtained by performing uniaxial tension tests in the range of temperatures of 160-320°c. The tensile velocity was 0.5, 5 or 50 mm/min. Next, in deep-drawing tests, the temperature and punch velocity were changed, and a punch with a diameter of 10 mm was used. The experimental temperature was changed in the range from 240 to 340°c in increments of 20°c, and the punch velocity was 0.1, 0.5, 1.0 or 1.5 mm/s. Deep drawability improved as the temperature increased. The optimum deepdrawing temperature was found to be 320°c. A numerical simulation of deep drawing was conducted by finite element method for examining stress and strain distribution around breaking location. The experimental results and numerical simulation results were in relatively good agreement. A maximum deep-drawing depth was also obtained in the experiments and simulation.