Micromechanical simulation and experimental investigation of aluminum-based nanocomposites  

作　　者：Mohammad Javad Ghasemi Mohammad Silani Ali Maleki Mostafa Jamshidian 

机构地区：[1]Department of Mechanical Engineering,Isfahan University of Technology,Isfahan,84156-83111,Iran

出　　处：《Defence Technology（防务技术）》2021年第1期196-201,共6页Defence Technology

基　　金：the Iran National Science Foundation(INSF).

摘　　要：Ceramic reinforced metal matrix nanocomposites are widely used in aerospace and auto industries due to their enhanced mechanical and physical properties.In this research,we investigate the mechanical properties of aluminum/Nano-silica composites through experiments and simulations.Aluminum/Nanosilica composite samples with different weight percentages of silica nanoparticles are prepared via powder metallurgy.In this method,Nano-silica and aluminum powders are mixed and compressed in a mold,followed by sintering at high temperatures.Uniaxial tensile testing of the nanocomposite samples shows that adding one percent of Nano-silica causes a considerable increase in mechanical properties of nanocomposite compared to pure aluminum.A computational micromechanical model,based on a representative volume element of aluminum/silica nanocomposite,is developed in a commercial finite element software.The model employs an elastoplastic material model along with a ductile damage model for aluminum matrix and linear elastic model for nano-silica particles.Via careful determination of model parameters from the experimental results of pure aluminum samples prepared by powder metallurgy,the proposed computational model has shown satisfactory agreement with experiments.The validated computational model can be used to perform a parametric study to optimize the microstructure of nanocomposite for enhanced mechanical properties.

关 键 词：Aluminum/nano-silica composites Powder metallurgy MICROMECHANICS 

分 类 号：TB333[一般工业技术—材料科学与工程]