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http://dx.doi.org/10.5228/KSPP.2003.12.6.588

Evolution of Microstructure and Mechanical Properties of Porous Al Alloy Under Various Heat Treatment  

류관무 (인하대학교 신소재공학부)
권영재 (인하대학교 소재연구소)
김준규 (인하대학교 소재연구소)
조원승 (인하대학교 신소재공학부)
조남희 (인하대학교 신소재공학부)
황진명 (인하대학교 신소재공학부)
유연철 (인하대학교 신소재공학부)
Publication Information
Transactions of Materials Processing / v.12, no.6, 2003 , pp. 588-596 More about this Journal
Abstract
The relationships between evolution of microstructure and mechanical properties of porous Al-3Si-2Mg-2Cu alloy after the foaming and various heat treating were investigated. The foamed alloy having various densities were manufactured by powder compact foaming and heat treated. Then compression test was performed with deformation rate of 0.5/s. The ultimate compression strength was not changed after solution heat treatment but the flow curve after ultimate strength showed very smooth and uniform plateau region. This change of flow curve means that the deformation mechanism is altered from brittle fracture to ductile deformation and the energy absorption property of Al foam is dramatically improved. The improvement of energy absorption without any detriment of mechanical properties is due to that the very brittle precipitation like Al-Cu and Al-Mg was uniformly dissolved in Al matrix after solution heat treatment. And various mechanical properties of Al alloy porous material were improved by 40% with aging of $200^{\circ}C$ and 50min. These improvements are ascribe to the various fine precipitates like $\Omega$ and $\theta$'.
Keywords
Aluminum Alloy; Foam; Solution Treatment; Aging; Precipitate; Porous;
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