Ductile Nature of Aluminum Alloys Essay

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Correlations Density Mechanical Properties Porous Alloys




In the recent years, various developments have been made concerning the manufacturing methods used in the production of foams from aluminum alloys. The results of various tests conducted indicate that closed cell powder-route aluminum foams are among the strongest and stiffest commercial aluminum foams in the market. Additionally, the tests showed that aluminum foams have low density and are attractive in that they are attractive materials for the cores of sandwich tubes, shells, and panels (Mccullough et al. 2323). Aluminum foams have many other desiring properties including good electrical conductivity, high-energy absorption, high fire retardance, relatively low thermal conductivity, and high acoustic damping. The main aim of this research study was to determine comprehensive and tensile properties of aluminum closed cell foams and interpreting the properties in relation cell wall and microstructure properties.



The materials used in the study were flat plates of aluminum foams, which were supplied by Mepura Limited. The densities of the plates supplied were ranging from 0.1 to 0.5. The focus of the study was to determine the effect of composition and foam density on the comprehensive properties and the tensile. The dense skin of the materials was removed using wire electro-discharge machining.

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For comprehension and tension tests, dogbone specimens were used further compression tests were performed using smaller cuboid specimens (Mccullough et al. 2324). Tension specimens and dogbone were cut in both longitudinal and transverse directions to investigate the degree of anisotropy. Comprehensive and tensile tests were conducted at a room temperature where the servo-hydraulic mechanical testing machine was used. To minimize the friction between the platens and specimen, comprehensive loading platens were lubricated using PTFE spray.



The results indicated that comprehensive and tensile yield strengths were approximately equal. It was found that comprehensive dogbone specimens used gave accurate values for the modulus and yielded strength, but it provides limited information on the subsequent comprehensive responses. It was concluded that the stress concentration within the foams led to early yielding, as indicated in the isolated locations (Mccullough et al. 2325). The stiffness and the strength of the foam through the thickness and in the transverse directions were approximately equal to that in the longitudinal direction. Such anisotropy is because of the cells within the foam are ellipsoidal shaped. The elastic modulus and density of the cell wall material are deemed as….....

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Work Cited


McCullough, K. Y. G., N. A. Fleck, and M. F. Ashby. "Uniaxial stress -- strain behaviour of aluminum alloy foams." Acta Materialia 47.8 (1999): 2323-2330.

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