Creep and fatigue behaviour of eutectic Sn62Pb36Ag2 solder
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1 Research Collection Doctoral Thesis Creep and fatigue behaviour of eutectic Sn62Pb36Ag2 solder Author(s): Weber, Ludger Publication Date: 1997 Permanent Link: Rights / License: In Copyright - Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library
2 Diss. ETH No Creep and Fatigue Behaviour of Eutectic Sn62Pb36Ag2 Solder A dissertation submitted to the SWISS FEDERAL INSTITUTE OF TECHNOLOGY ZURICH for the degree of Doctor of Technical Sciences presented by Ludger Weber Dipl. Werksting. ETH born April 5, 1969 citizen of Stein am Rhein (SH) accepted on the recommendation of Prof. Dr. A. Birolini, referee Prof. Dr. PJ. Uggowitzer, co-referee 1997
3 vn Abstract Broken solder joints represent a frequently observed mode of field failure of surface mounted devices. Finite Element Modelling (FEM) of service conditions has been established as tool for lifetime assessment of solder joints. For physically meaningful simulation, an appropriate constitutive description of the solder is crucial. In this work, a comprehensive constitutive description of eutectic lead-tin-silver solder is presented including microstructural features such as coarsened shear band forming and recrystallisation. The constitutive behaviour in terms of stress-strain rate relation has been determined using single lap joint specimens. After soldering, strain rates depend on stresses by a power-law with exponent 7. The solder softened during further deformation and the exponent of the stress decreased gradually to a value of 3.3 within 100% engineering were related to the development strain. Both features of coarsened shear bands in the solder joint. These shear bands formed owing to local recrystallisation. The thickness of the shear band depended on the rate of cooling during solidification and on the applied strain rate being the thicker the slower the cooling rate and the higher the strain rate. The kinetics of the development of coarsened shear bands were determined by monitoring the softening in tensile tests. The extent of recrystallisation within the shear band was found to depend on the amount of local deformation. The imposed deformation was increasingly localised in the shear band as recrystallisation proceeded. Hence, strains and strain rates were determined with respect to the shear band thickness. Damage in form of homogeneously distributed reduction in load bearing area accumulated as deformation increased. In uniaxial deformation, the rate of damage per unit strain was proportional to the applied stress and the remaining load-bearing area. Creep strain-controlled cyclic loading was performed in order to compare evolution of the microstructure in unidirectional and cyclic deformation.
4 vm Both, shear band formation as well as transition from high to low stress exponent was observed. However, quantitative modelling by the equations determined in uniaxial testing fell short. Damage evolved according to a Coffin-Manson approach and depended thus on the deformation path.
5 DC Zusammenfassung Das Brechen von Lotstellen stellt einen oft beobachteten Ausfallmechanismus fiir oberflachenmontierte Bauteile dar. Die Finite Element Modellierung (FEM) von Feldbelastungen ist daran, sich als Werkzeug zur Beurteilung der Lebensdaueraussichten von Lotstellen zu etablieren. Eine grundlegende Bedingung fiir aussagekraftige Resultate ist die Verwendung angemessener Materialmodelle. Diese Arbeit stellt eine umfassende Materialmodellierung von eutektischem Blei-Zinn-Silber Lot vor, die auch Eigenheiten der Mikrostruktur, insbesondere die Bildung vergroberter Scherbander und Rekristallisation, berucksichtigt. Das Materialverhalten in Form einer Spannungs-Dehngeschwindigkeitsbeziehung wurde an single-lap-joint Proben bestimmt. Nach dem Loten hangt die Dehngeschwindigkeit iiber ein Potenzgesetz mit Exponent 7 von der Spannung ab. Das Lot erweicht unter Aufbringen von Dehnung und der Spannungsexponent sinkt innerhalb 100% Ingenieurdehnung stetig bis auf einen Wert von 3.3 ab. Beide Veranderungen konnen mit der Ausbildung von vergroberten Scherbandern in Zusammenhang gebracht werden. Die Scherbander entstehen aufgrund lokaler Rekristallisation. Die Dicke der Scherbander hangt von der Kuhlgeschwindigkeit bei der Erstarrung und von der angelegten Dehngeschwindigkeit ab: sie ist umso grosser je geringer die Kuhlgeschwindigkeit und je hoher die aufgebrachte Dehngeschwindigkeit. Die Entwicklungskinetik der vergroberten Scherbander wurde mittels des Erweichungsverhaltens in Zugversuchen bestimmt. Die Vollstandigkeit der Rekristallisation isst abhangig von der aufsummierten lokalen Deformation. Die an der Probe aufgebrachte Deformation konzentriert sich mit voranschreitender Rekristallisation im Scherband. Daher miissen die Dehnungen und Dehngeschwindigkeiten umgerechnet werden. auf die Dicke des Scherbands Schadigung in Form von homogen verteilter Abnahme des tragenden Querschnitts entwickelt sich mit zunehmender Deformation. Die Zunahme in der Schadigung pro Deformationseinheit ist proportional zur angelegten Spannung und dem verbleibenden tragenden Querschnitt.
6 X Kriechdehnungskontrollierte Wechsellastversuche wurden durchgefiihrt, um die Entwicklung des Gefiiges in einachsiger und Wechselbeanspruchung vergleichen zu konnen. Sowohl die Bildung von Scherbandern als auch das Absinken des Spannungsexponenten konnte beobachtet werden. Die quantitative Modellierung dieser Phanomene mittels der fiir den einachsigen Fall bestimmten Gleichungen fuhrte zu keinem befriedigenden Ergebnis. Schadigung entwickelt sich in Wechsellasttests gemass eines Coffin- Manson Ansatzes und ist somit wegabhangig.
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