Effect of Mg Content and Heat Treatment on the Mechanical Properties of Low Pressure Die-Cast 380 Alloy

Abstract EN

The present study was carried out on a 380 alloy containing 9.13% Si, 3.22% Cu, 1.01% Fe, 0.06% Mg, 0.16% Mn, and 2.28% Zn.

The magnesium level was increased to 0.3 and 0.55%, by adding pure Mg to the melt.

Tensile and fatigue samples were produced using low pressure die casting.

The results show that the average dendrite arm spacing was about 6 μm.

Increasing the amount of Mg from 0.06% to 0.55% increased the volume fraction of π-Al8Mg3FeSi6 and Q-Al5Cu2Mg8Si6 phases from 0.8% to 1.7%.

Following solutionizing at 490°C for 8 h, the maximum ultimate tensile strength was obtained from alloys containing 0.3% Mg.

Further increases in Mg content resulted in an increase in the amount of insoluble intermetallics and, hence, low tensile strength.

Aging at 155°C for times up to 25 h resulted in a linear increase in the alloy strength regardless of the amount of added Mg.

Aging at 220°C, however, revealed multiple peaks corresponding to the precipitation of various phases.

A good relation between the applied force and the number of cycles prior to failure was established.

The alloy containing 0.3% Mg produced the best fatigue resistance.

The effect of porosity was more pronounced on the fatigue samples than on the tensile bars.