Influence of molding conditions on tensile properties of AZ91D alloy products prepared by injection molding

The influence of molding conditions on the strength of the magnesium alloy products formed using an injection molding method was examined. Test pieces were cut from a plain plate made of AZ91D, which was molded in a metal die using a Thixomolding machine. The test piece, whose thickness was 2.5 mm, was examined. The barrel temperature was varied from 873 to 903 K, and the gate velocity was varied to the extent possible, between 11.4 and 28.7 m/s. The mold temperature ranged from 423 to 483 K. The test pieces.. performance was determined using a tensile test. The main results obtained are as follows. The calculated average roughness decreased when the gate velocity increased. The tensile strength improved because the chill rate increased when the temperature of the mold decreased. The 0.2% proof strength was not influenced by the shooting conditions in this study. The tensile strength and the elongation to fracture depended strongly on the gate velocity. © 2014 The Japan Institute of Light Metals.