INFLUENCE OF AGEING BEHAVIOR ON HARDNESS OF SQUEEZE CAST AL 7075 - 2.5% TICP USING RESPONSE SURFACE METHODOLOGY
Keywords:
Precipitation hardening, squeeze casting, TiCp, Response surface Methodology [RSM], Aluminum metal matrix composite [Al MMC]Abstract
In this work, the effect of precipitation hardening on hardness of Al 7075 reinforced with 2.5 % TiCp has been investigated. The composite is fabricated by employing squeeze cast process, in which the combination of both casting and forging processes can be done under high pressure. Squeeze casting is chosen for this work since this process results in negligible porosity, refined grain structure and high quality cast composites. The precipitation hardening process is carried out within a temperature range of 130 – 210 °C for the time interval of 1-8 hours. Hardness is recorded to closely monitor the age hardening effect and is employed to ascertain the optimum hardness using SYSTAT as a statistical tool.
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