ABSTRACT
This study has evaluated the effectiveness of metallic materials as chill in sand casting of aluminium alloy. Four plates of dimension 165mm x 80mm x10mm were cast using sand mould. Steel, copper and brass chills in form of cylindrical bar of geometry 7mm in diameter and 50mm long were inserted, side by side at regular intervals of 30mm in each sand mould and the last sample was left unchilled. Experimentation involved testing of mechanical properties and metallographic analysis of cast samples. The results obtained revealed that the sample chilled with copper has the highest mechanical properties (ultimate tensile strength of 126.13MPa, hardness of 6.8Hv and impact strength of 23.5J).Also sample chilled with copper revealed evenly distributed microstructure which is due to the fast solidification rate of the casting due to the high thermal conductivity of copper. The brass chill sample displayed better mechanical properties (ultimate tensile strength of 115.8MPa, hardness of 5.7Hv and impact strength of 22.4J) than sample chilled with steel (ultimate tensile strength of 101.33MPa and hardness of 5.4Hv). However, the unchilled sample showed the lowest ultimate tensile strength of 70.67MPa, hardness of 4.2Hv and impact strength of 22.5J.
ABSTRACT
The study evaluated the relationship between fiscal policy and economic growth in Nigeria using time series data spanning from 1...
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The research is focused on the impact of product quality on sales volume in Nigerian Bottling Company. The...
ABSTRACT
Just as it is common for conflicts to arise in every human relationship, the relationship between an employer and an employee is...
BACKGROUND TO THE STUDY
In the state of Edo, one of the ways in which land is prepared for agriculture is by the use of...
ABSTRACT
Lannea bartei (Oliv.) Engl. is a plant with medicinal and commercial uses found usually in the tropical regions like Africa espe...
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This study was carried out on unemployment and security challenges in Africa. Nigeria as a country gained her independence on Oc...
BACKGROUND TO THE STUDY
The poorest urban populations in Africa live in slums. Slum dwellers' homes are typically di...
Background of the Study
Mathematics throughout the world is regarded as essential tool in many fields, including natural...
ABSTRACT
This study investigated the pre-service teachers‟ attitudes towards web-quest instruction in Colleges of Education Katsina state...
ABSTRACT
Nigeria is naturally endowed with vast expanse of forest land, the swamp forests in the extreme Southern part o...