Abstract
Hot-tearing susceptibility of Mg–9Al– xZn alloys is studied. Crack-ring molds were used to test the hot-tearing susceptibility. In situ thermal analysis, optical microscopy, scanning electron microscopy (SEM) and line scan were used to examine the hot-tearing behavior. Hot-tearing originates along the grains at the end of solidification. With Zn additions, the quantity of phase with low melting point in grain boundaries is increased, its melting point is decreased and the hot-tearing susceptibility is increased. The segregation of Zn element in grain boundaries is the main contribution to the high hot-tearing susceptibility of Mg–9Al– xZn alloys.
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