The Zn based alloys, Zn-Al (alloys ZA or ALZEN) have called the attention like substitute materials of aluminum based alloys, fused irons and brasses. These alloys are of relatively low melting point, they are versatile and they can be manufactured for techniques of foundry, including solidification under pressure, compocasting and reocasting. ZA alloys have a high potential, they show a good performance in service and due to its low cost they have a great variety of industrial applications. The present study has as objective to analyze and to compare different solidification conditions of diluted Zn-Al alloys, Zn-1wt%Al, Zn-5wt%Al (% in weight): 1) alloys directionally solidified with predominant caloric extraction from the base and which have only two interphases [liquid/(solid+liquid)], IL and [(solid+liquid)/solid] IS and, 2) alloys directionally solidified in an horizontal form with caloric extraction from both ends, which gives place to four solidification interphases, two IL interphases and two IS interphases moving in contrary senses. The presence of four interphases determines that the end of the solidification occurs next to the geometric center of the samples and it seems to be related with the presence of pores or hollows derivated from subsuperficial internal contraction. For each alloy of the considered concentration the speeds of the interphases are determined as a function of time and position, and also their accelerations.

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1. Parameters of Solidification of Metal Matrix Composites