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Effect of Heat Treatment Parameters on the Structure and Mechanical Properties of Aluminium Bronze (Cu-10wt%Al)
Current Issue
Volume 5, 2017
Issue 3 (June)
Pages: 16-24   |   Vol. 5, No. 3, June 2017   |   Follow on         
Paper in PDF Downloads: 12   Since Oct. 19, 2017 Views: 379   Since Oct. 19, 2017
Authors
[1]
Kingsley Chidi Nnakwo, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
[2]
Charles Amamchukwu Obi, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
[3]
Jerome Ugwu Odo, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
Abstract
An investigation was carried out to study the effect of heat treatment parameters on the structure and mechanical properties of aluminium bronze (Cu-10% wt. Al). The heat treatment parameters investigated were solutionizing temperature (800 and 900°C) and soaking time (0.5, 1, 2 and 3hrs). The alloy samples were produced using permanent die casting technique. Standard specimens were prepared from the as-cast and heat treated samples for tensile, hardness and impact strength tests as well as microstructural analysis according to standard. The samples were solutionized at temperature of 800°C and 900°C for 0.5, 1, 2 and 3hrs respectively and quenched in brine. The tensile, hardness and impact strength test were conducted using JPL tensile strength tester (Model: 130812), dynamic hardness tester and impact testing machine (U1820) respectively. The alloy microstructures were studied using an optical metallurgical microscope (Model: L2003A) and scanning electron microscopy (SEM). Microstructural analysis result indicated sparse distribution of coarse needle-like α+γ2 precipitates in the as-cast specimen and presence of fine pearlite (α + γ2) in a matrix of α dominance in the heat treated specimens. The presence of coarse intermetallic compounds (β`- phase) was revealed as the soaking time increased at high solutionizing temperature (900°C). The obtained results indicated that heat treatment significantly improved all the tested mechanical properties. Maximum percentage elongation was obtained in the specimens solutionized at 800°C for 3hrs and quenched in brine with %E of 73.1%. The specimen solutionized at 900°C for 0.5hr gave the maximum hardness of 513MPa. The ultimate tensile strength of aluminium bronze in as-cast condition increased from 240MPa to 609MPa when the alloy was solutionized at 900°C for 0.5hr. The heat treated alloy also demonstrated impact strength of 106J at solutionizing temperature of 800°C for 0.5hr.
Keywords
Solutionizing Temperature, Soaking Time, Quenching Media, Heat Treatment, Properties
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