A Study On Precipitation Hardening Of 6061-T6 Aluminium Alloy

Cheng Hwai, Aw (2006) A Study On Precipitation Hardening Of 6061-T6 Aluminium Alloy. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project presents an experimental study on precipitation hardening of 606 l -T6 aluminum alloy to determine the effects of artificial ageing on the effect of strength. The precipitation hardening usually undergoes a thermal treatment, which consists of a solution heat treatment (550°C for 1 hour), quenching (water, at room temperature) and artificial ageing. This study was mainly focus on artificial ageing upon which the temperature is varying between 175°C to 420°C at different period of time. The Vickers hardness test was then be carried out to evaluate the hardness before and after ageing. The microstructure variation was analyzed using scanning electron microscope (SEM) and also optical microscope to observe the important features such as precipitate before and after being placed into the heat treatment solution. Tensile tests were therefore conducted after ageing to establish the relationship between hardness and tensile strength. The optimum ageing time and temperature were also determined at the end of this experiment to obtain reductions in energy and total cost. This study leads to the conclusion that the optimum I peak aged can be achieve within l 75°C to 195°C with 2 to 6 hours of ageing time. The contribution of short time ageing is comparable to that of longer ageing time from previous researcher.

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