Effect of heat treatment on mechanical properties of equal channel angular pressing (ECAP) processed A356 aluminium alloy

Aziz, Nor Azimah (2018) Effect of heat treatment on mechanical properties of equal channel angular pressing (ECAP) processed A356 aluminium alloy. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Equal-channel angular pressing (ECAP) is a processing method in which a metal is subjected to an intense plastic straining through simple shear without any corresponding change in the cross-sectional dimensions of the sample. This procedure may be used to introduce an ultrafine grain size into polycrystalline materials. The aim of this study is to investigate the microstructure evolution and mechanical properties of ECAP. The microstructure of A356 aluminium alloy was examine by using optical microscope (OM) and scanning electron microscopy (SEM) to determine the grain size of the aluminium alloy. ECAP proved that it able to produce ultra-refine grain boundary and it can be enhanced by heat treatment. Tensile test was conducted using Universal Tensile Machine (UTM) with purpose of to evaluate the strength of the material which correspond to the load applied. From the test, ECAP with T6 heat treatment achieved the highest value of UTS 290.027 MPa, compared to ECAP non heat treated that obtained 267.027 MPa, while for as-cast with heat treatment is 243.189 MPa and last but not least is as-cast with value of 188.731 MPa. After that, hardness test had been conducted in order to know the hardness of the sample. ECAP with heat treated obtained the highest hardness with 93.09 HV, followed by ECAP which is 82.02 HV, 77.96 HV for as-cast with heat treated and lastly as-cast with value of 76.17 HV. All of the samples went through T6 heat treatment processes that were solid solutioning, quenching and natural aging. T6 heat treatment was useful to increase the mechanical properties of the aluminium alloy. The microstructure evolution and mechanical properties evaluation were determined due to actual properties of the alloys that can be used in various applications.

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