A theoretical investigation of the energetic of the bulk as wellas the surface of Al-Sn liquid alloys has been made through the studyof the concentration dependence of various properties such asconcentration fluctuations in the long wavelength limit S_CC(0),CSRO parameter (α_1), diffusion (D_M), surface tension (γ) andsurface composition (C~s_i). Besides the use of statistic mechanicalmodel for the surface tension and surface composition, we have alsomade an attempt to link the surface tension with the bulk through thesensitive S_CC(0) and isothermal compressibility. Our computedresults of the surface tension have been further used to compute thework of adhesion (W) and interfacial tension (γSL) between solidsAl_2O_3 and liquid Al-Sn alloys over the whole concentration range.Our study suggests like atoms pairing as nearest neighbors at allconcentrations. The maximum tendency for the segregation ahs beenobserved around C_Sn=0.35. As regards surface tension, the resultsobtained from S_CC(0) are quite different form those obtained fromstatistical mechanical model in the middle concentration range ofAl-Sn alloys. However, both approaches present almost the same trend,i.e. a decrease in γ with the addition of San to Al, in theexperimental concentration range (3.8 /100 Sn). The surface of theAl-Sn system has been found to be enriched with Sn atoms at all bulkcompositions. It is also observed that W decreases with the additionof Sn Al to Sn. So far as γSL is concerned, it remains unaffected upto 80/100 Sn and shoots up sharply after that - being one
展开▼
