کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1559475 | 1513827 | 2006 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Bismuth activity in lead-free solder Bi-In-Sn alloys
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The thermodynamics of Bi-In-Sn lead-free solder alloys has been studied by two different experimental techniques: torsion-effusion and differential scanning calorimetry. The results show that this ternary system at fixed Bi composition, XBi=0.20, and 565 K behaves as a non-ideal system with exothermic ÎmixHT0 passing through a minimum at XIn=0.58 and XSn=0.22. In the whole range of the quantity XSn/(XSn+XIn) and at 1050 K the average value of the bismuth activity is 0.14±0.02 which implies an average activity coefficient of Bi equal to 0.70±0.01. The Bi activity in ternary alloys at 1000 K with variable XBi and fixed ratio Ï=XSn/XIn=0.85 has been measured. The excess integral free energy change for the mixing, ÎmixGT0(xs), has also been evaluated by making use of both the torsion-effusion experimental and literature data for Bi-Sn and Bi-In binary systems. Under these conditions, the ternary system is not a regular solution and the entropy contribution to the free energy of mixing is dominating the Gibbs energy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Calphad - Volume 30, Issue 4, December 2006, Pages 431-442
Journal: Calphad - Volume 30, Issue 4, December 2006, Pages 431-442
نویسندگان
B. Brunetti, D. Gozzi, M. Iervolino, V. Piacente, G. Zanicchi, N. Parodi, G. Borzone,