Navegando por Palavras-chave "Brittle Intermetallics Compounds"

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    Efeito Da Intercamada De Silício Na União Dissimilar A Laser De Ti-6Al-4V E Aa6013-T4
    (Universidade Federal de São Paulo (UNIFESP), 2017-09-06) Moreira, Andre Felipe Ribeiro [UNIFESP]; Oliveira, Aline Capella De [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The main goals of this dissertation were analyze the effects and influence of the deposited silicon at the interface of the laser joint between the dissimilar metals Ti-6Al-4V and AA6013-T4, in order to evaluate the deposition and joining features in microstructural terms and the inhibition the formation of brittle intermetallic compounds, with the aim of improving the mechanical properties of the joint. For this, proposes the deposition of silicon on Ti-6Al-4V substrate using magnetron sputtering technology and subsequent joining with the AA6013-T4 by laser (Yb: fiber) processing that allows greater control of parameters of the bonding process between the dissimilar metals. The results demonstrate that increasing the deposition time, or the utilized power, influences the thickness of the silicon layer deposited on Ti-6Al-4V substrate, with values between 0.9 - 7.5 μm. Furthermore, also shows that better joining condition between the dissimilar alloys in respect of the microstructure region and not significant presence of defects are obtained from 0.2 mm displacement of the beam on the AA6013-T4. The intermetallic layer thickness, with the predominance of fragile intermetallic TiAl3, was reduced from 15 μm to 5 μm. However, such reduction was not sufficient to cause a significant change in the mechanical strength of the assembly. From the results obtained verified the viability of the deposition of silicon on Ti-6Al-4V substrate with the formation of a film of good adhesion in all conditions analyzed. However, the correlation between the introduction of silicon and its influence in the formation of the intermetallic compounds at the joining interface between the dissimilar metals, Ti-6Al-4V and AA6013, was not favorable to increase the mechanical strength of the joint.