Aluminum and its alloys solidify in columnar structure with large grain size which results in deterioration of their surface quality and strength. Aluminum alloys with a wide range of properties are used in engineering structures. Copper has been the most common alloying element almost since the beginning of the aluminum industry, and a variety of alloys in which copper is the major addition were developed. In this work, the influence of pure copper addition to commercially pure aluminum hardness, compression strength and thermal conductivity were studied. Six different Al-Cu alloys with 1,2,3,4,5 and 6%Cu content were prepared and experimentally tested. It was found that adding up to 6wt%Cu led to linear increasing in Brinell hardness, compression strength and slightly increasing in the thermal conductivity of aluminum-copper alloys.
Aluminum and its alloys normally solidify in a columnar structure according to directionally slow cooling rate which results in decreasing the mechanical strength. Aluminum has a huge tendency to unite with oxygen to form oxide film on its surface, offers of it excellent resistance to corrosion and provides years of maintenance-free service and offered it excellent corrosion resistance and spare a lot of years without maintenance. Because of the aluminum and its alloys in fact work applications. Study was carried out on the coppers impact in addition to pure aluminum were six different Al-Cu alloys of (1, 2, 3, 4, 5 and 6) wt% Cu content were prepared and experimentally tested in acidic and alkaline medium. As in general the increase in the percentages of copper led to increased total corrosion rates of the samples submerged in corrosive medium. From obtained results has been reached that the corrosion rate of the alloy which 6%Cu content was (0.02585MPY) higher than the corrosion rate of the alloy of the 1%Cu content where it was (0.00081MPY) were the two alloys submerged in acidic medium, while the corrosion of the alloy 6%Cu was (0.505414MPY) higher than the from the corrosion rate of 1%Cu which it was (0.433369MPY) were the two alloys submerged in alkali medium. As was attained that the corrosion rates in the alkaline medium were higher in acidic medium corrosion rates.
Creep at high temperature leads to gradual deformation under constant loads. In this paper, a comparative study of the fatigue effect of stainless steel and low carbon steel was made, whereby each sample had a constant weight of 24 kg and the experiments on elongation were performed at temperatures 660℃, 700℃, and 740℃ at a constant time of 10 minutes for each experiment. It was found that the highest elongation rate found to be 0.76% for stainless steel metal at a temperature of 740℃. On the other hand, the amount of elongation for low-carbon steel metal at the same temperature found to be 1.9%. This difference in the amount of elongation observed due to the difference in the microstructure of the two metals. The hardness test showed that the maximum value for stainless steel specimens found to be 225 BHN at 660℃, while for low carbon steel specimens 106BHN at 660℃.
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