Sn-0.7 wt%Cu-(xNi) alloys: Microstructure-mechanical properties correlations with solder/substrate interfacial heat transfer coefficient

Author(s)

Silva, Bismarck Luiz ^[1] ; Cheung, Noe ^[2] ; Garcia, Amauri ^[2] ; Spinelli, Jose Eduardo ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Dept Mfg & Mat Engn, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 632, p. 274-285, MAY 25 2015.
• Web of Science Citations: 19

Abstract

In spite of being barely studied, the prediction of mechanical properties by controlling and monitoring solidification thermal parameters (growth rate - v; cooling rate - (T) over dot; solder/substrate interfacial heat transfer coefficient - h(i)) may be a powerful tool in the pre-programming of optimized final properties in solder alloys. The management of these parameters is fundamental to determine the final as-soldered microstructure, including the morphologies and sizes of phases. Within this scope, the aim of the present investigation is to determine interrelations of thermal parameters (v, (T) over dot, h(i)), microstructure and tensile properties for Sn-0.7 wt%Cu-xNi (0-0.1 wt%Ni) solders solidified under steady-state conditions against a copper water-cooled substrate. It is demonstrated that the ultimate tensile strength can be linearly correlated with h(i) for Sn-Cu-Ni alloys. The final microstructures are shown to be very responsive to the changes in v as well as in Cu and Ni contents. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/13030-5 - Microstructure, thermal parameters, segregation and mechanical properties of lead-free Sn-based, Zn-based and Bi-based solder alloys
• Grantee: José Eduardo Spinelli
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/08259-3 - Microstructure and mechanical behavior of Sn-Bi-Cu and Sn-Bi-Ag lead-free solder alloys
• Grantee: Bismarck Luiz Silva
• Support Opportunities: Scholarships in Brazil - Doctorate