The Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum Alloys

Description

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Abstract

A study of the effects of pressure on microstructure and mechanical properties of die cast aluminum alloys A1350 and A380 was carried out and subsequent analysis made. Pressure was regulated at various levels in the die cast machine.

Both alloys were cast into samples each under different applied pressures. The mechanical properties of both alloys were tested and microstructure analysis was done and the results for both tests were compared for both alloys.

The results obtained show hardness, tensile strength, yield strength and impact strength of both alloys varied with applied pressure in the casting process.

The hardness values increased with applied pressure but not too significantly from 76 to 85 HRN for A380 alloy and 77 to 86 HRN for A1350 alloy as pressure rose from 350 to 1400kg/cm2 . The yield strength of both alloys also increased with applied pressure.

Introduction

According to Richard et al, (1967), metal casting may be defined as a metal object produced by pouring molten metal into a mould containing a cavity which has the desired shape of the end product, and allowing the molten metal to solidify in the cavity.

Historical data indicates that casting began around 4000 B.C. According to Taylor et al, (1959), copper was the first metal to be cast and it was used to produce bells for large cathedrals at the beginning of the 13th century.

In the 14th through 16th centuries, metal casting evolved from what was an art form to the casting of engineering shaped components (Mikelonis, 1986).

However, the first authenticated casting in aluminium was produced in 1876 according to Anon (1978). In the present context, die casting involves all processes that are based on use of metallic moulds (Dahle, 2002). Casting or foundry is a process of forming objects through pouring of molten metals into prepared moulds.

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