HOMOGENIZATION EFFECT ON THE PROPERTIES OF MAGNESIUM BRONZE DOPED WITH CARBIDE FORMING ELEMENTS

K.O. Iyebeye, C.M. Ekwedigwe, Bello Imamudeden, C.N. Nwambu

Abstract


Copper-magnesium alloys are essential for many industrial applications because of their excellent electrical conductivity and strong strength. Copper-magnesium alloys require careful microstructure management to provide the best mechanical characteristics. This paper explores the influence of homogenization effect on the grain characteristics and mechanical properties of magnesium bronze doped with carbide forming elements. The designed alloy compositions were melted, cast, and subjected to homogenization at 900oC for 5 hours and homogenization heat treatment (400oC, 450oC & 500oC) was conducted using a Pyradia benchtop muffle furnace. The grain characteristics of the produced alloys were analyzed using a scanning electron microscope. The properties investigated were tensile strength, hardness, and impact strength. The SEM results revealed the presence of segregated and coarse intermetallic phases in the alloy samples. The surface morphology of the doped alloys consisted of refined and modified intermetallic phases evenly dispersed in the alloy structure. The mechanical test results showed that the alloy's tensile strength and hardness increased significantly by adding molybdenum and nickel. Homogenization heat treatment led to a further increase in the tensile strength and hardness of Cu-4wt%Mg alloys to 71.7% and 54.2% respectively. The alloy samples showed decreasing trends in impact strength values after undergoing homogenization heat treatment. For the benefit of the automotive and aerospace industries, this study emphasizes the significance of controlled homogenization in optimizing the microstructure and improving the structurally sensitive properties of copper-magnesium alloys

KEYWORDS: Copper; magnesium; molybdenum; nickel; heat treatment, mechanical properties.


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