Correlation Study of Relationship Between Hardness and Microstructure in Mechanical Properties of Heat Treatable Aluminium Alloys

MELVIN LUAT, AUGUSTINE LUBON (2019) Correlation Study of Relationship Between Hardness and Microstructure in Mechanical Properties of Heat Treatable Aluminium Alloys. [Final Year Project Report] (Unpublished)

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Abstract

This research is to investigate the unknown type of aluminium alloys either they are heat treatable or non-heat treatable alloy by conducting same heat treatment. Three types of aluminium alloys are used to undergo heat treatment; forged aluminium, aluminium from mounting gearbox component and aluminium from roofing component which are denoted as samples A, B, and C, respectively. To indicate whether these aluminium alloys are heat treatable, each of them are evaluated by hardness test. The difference of hardness value between as received, solutionized and precipitation hardened will determine whether the aluminium alloy is heat treatable or not. Therefore, the hardness value is correlated and justified with metallographic examination by observing microstructure under scanning electron microscope. Based on the results obtained, sample A shows an increase of hardness after heat treatment. Therefore, the sample is heat treatable aluminium alloy. On the other hand, sample B and C show no changes of hardness occurred after heat treatment. These samples show a decrease in hardness after solutionizing. Hence, they are denoted as non-heat treatable aluminium alloys. The composition of these alloys studied through EDX analysis also supports the final conclusion.

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