1,721,008 research outputs found
Manuale della difettologia nei getti pressocolati II Edizione- Handbook of defects in high pressure diecastings
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Manuale della difettologia nei getti pressocolatiHandbook of defects in high pressure diecastings
No full textMechanical and Impact Behaviour of (Al2O3)P/2014 and (Al2O3)P/6061 Al Metal Matrix Composites in the 25-200 °C Range
No full textThe present work is aimed at studying the impact behaviour of commercially available Aluminum matrix composites, in a temperature interval ranging from 25 °C to 200 °C. The results of instrumented impact tests and of microstructural and fractographic observations are correlated with the tensile properties of these materials. A description of the phenomena involved (particles cracking, interfacial failure associated to matrix-reinforcement reaction layers, ductile behaviour of the matrix) is given. The effect of testing temperature as well as that of the matrix characteristics are presented and discussed
Influenza di matrice, rinforzo e temperatura di prova sulla resilienza di compositi in lega AA6061 ED AA2014
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Impact behaviour of A356 alloy for low pressure die casting automotive wheels
No full textInstrumented impact strength tests have been carried out on KV sub-size Charpy samples drawn from A356 aluminium alloy 17-inch wheels, produced by a low pressure die casting process (LPDC). The wheels show different geometry and thermal treatment. In this paper, the effects of microstructure and defects on the impact properties are studied. In order to evaluate the amount and distribution of defects around the notch, the specimens have been analysed by means of density measurements, according to Archimedes’s principle, and X-ray investigations.
Through an optical microscope, the microstructural features, such as secondary dendrite arm spacing (SDAS) and eutectic silicon particles, have been examined. A dedicated image-analysis software has been used for SDAS measurements.
By means of optical and scanning electron microscopes, the fracture profile and surface of Charpy specimens have been investigated in order to identify the crack paths and to describe the characteristic morphological features of the fracture surface.
Numerical simulations have been performed to study the filling and solidification behaviour of the alloy of the wheels analysed, in order to predict the final microstructure and shrinkage formation
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