Browsing by Author "Torregaray, Amaia"
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Item Analysis of the solidification and microstructure of two aluminium alloys reinforced with TiB2 particles(2011-09) Egizabal, Pedro; García De Cortázar, Maider; Torregaray, Amaia; Veillère, Amélie; Douin, Joël; Silvain, Jean François; Tecnalia Research & Innovation; CIRMETALTwo aluminium alloys with 6 wt% TiB2 particles are studied for applications where increased wear resistance and mechanical strength at high temperature are required. The incorporation of hard ceramic particles has a strong influence on the microstructure and properties of the alloys. TiB 2 particles play an important role in the nucleation of the different phases of the alloys during solidification, and in the reduction of grain size and porosity. The solidification patterns of Al-Si7Mg0.3 + TiB2 (6 wt%) and Al-Cu5MgTi + TiB2 (6 wt%) materials are compared to their corresponding non-reinforced alloys, and the microstructures are analyzed. Two aluminium alloys with 6wt% titanium diboride (TiB2) particles have been studied. TiB2 particles play an important role in the nucleation of the different phases of the alloys during solidification, and in the reduction of grain size and porosity. This study analyses the solidification patterns and microstructure of Al-Si 7Mg0.3+TiB2 (6wt%) and Al-Cu 5MgTi+TiB2 (6wt%) materials compared to their corresponding non-reinforced alloys.Item Microstructural analysis of the reinforced Al-Cu5mgti/Tib2 5wt % alloy for investment casting applications(2010-06) Egizabal, Pedro; De Cortazar, Maider García; Douin, Joël; Torregaray, Amaia; Lahaye, Michel; Vincent, Cécil; Silvain, Jean Frangois; Tecnalia Research & Innovation; CIRMETALThe paper describes the influence of 5wt % titanium diboride (TiB 2) particles on the microstructure of an Al-Cu alloy produced by plaster casting process. The elaboration route leads to a composite material with 1% of in situ TiB2 particles and 4% ex situ of TiB2 particles. The comparison of the reinforced alloy with the corresponding non-reinforced counterpart makes clear that the presence of TiB2 particles has a large influence in the observed microstructure. The presence of TiB2 particles decreases the grain sizes and the porosity level. It is also found that TiB2 particles play an important role in the precipitation events of Al2Cu precipitates that are formed during solidification at the TiB2/aluminum matrix interfaces.