کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1576553 1514778 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Indentation creep of lead-free Sn–3.5Ag solder alloy: Effects of cooling rate and Zn/Sb addition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Indentation creep of lead-free Sn–3.5Ag solder alloy: Effects of cooling rate and Zn/Sb addition
چکیده انگلیسی

The effect of cooling rate and separate additions of 1.5 wt% Zn and 1.5 wt% Sb on the creep behavior of Sn–3.5 wt% Ag lead-free solder alloy was investigated by indentation creep testing at 298 and 370 K. All three alloys were prepared at two different cooling rates of 0.01 K s−1 and 8 K s−1, in order to examine the influence of cooling rate on their creep resistances. This affected the microstructure and thus, the creep behavior of the materials. Fast cooling enhanced the creep resistance by refining the coarse plate-like Ag3Sn particles. Both the ternary alloys showed creep resistances higher than that of the eutectic binary Sn–3.5Ag alloy. The higher creep resistance of the Zn-containing alloy is attributed to the refinement of the Ag3Sn precipitates, while solid solution hardening of Sb in the Sn matrix is responsible for the superior creep behavior of the Sb-containing alloy. The higher creep resistance of the ternary alloys is more pronounced at higher temperatures, where the binary base alloy weakens more readily. The stress exponents were found to be in the range 6.6–9.8 and 7.1–10.2 for the slowly cooled (SC) and the fast cooled (FC) conditions, respectively. These are in agreement with those determined by room temperature conventional creep and other creep testing methods of the same materials reported in the literature. The high stress exponents together with the activation energy of about 80 kJ/mol may suggest that the dominant creep mechanism is dislocation creep.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 565, 10 March 2013, Pages 236–242
نویسندگان
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