Microstructure and creep of eutectic indium/tin on copper and nickel substrates

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Journal of Electronic Materials (A.I.M.E. Metallurgical Society); (United States)

DOI:https://doi.org/10.1007/BF02655434· OSTI ID:5434113

Freer, J L; Morris, Jr, J W ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

The behavior during creep in shear of eutectic indium-tin joints on copper and nickel substrates was examined in order to determine the effect of creep deformation on the microstructure of the alloy. Primary creep was absent in all the samples tested. The stress exponent at 20[degree] C was much higher for samples on nickel than for those on copper, indicating a different creep deformation mechanism. Also, the microstructure within the indium-tin joints differed significantly with a change of substrate. Samples with a nickel substrate showed a colony microstructure that was not observed in those with a copper substrate. Thus, eutectic morphology is important in determining deformation mechanism during creep. The microstructure within the joints in tested and untested regions of the samples was effectively the same. This is quite distinct from the behavior of eutectic lead-tin observed in previous work. Lead-tin formed a recrystallized band of material along a region of concentrated shear deformation. While the deformation pattern in the indium-tin samples appeared to be the same as for lead-tin, the microstructural changes did not occur. This implies that the behavior observed in lead-tin is not universal to eutectic alloys. 8 refs., 7 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5434113
• Journal Information: Journal of Electronic Materials (A.I.M.E. Metallurgical Society); (United States), Journal Name: Journal of Electronic Materials (A.I.M.E. Metallurgical Society); (United States) Vol. 21:6; ISSN JECMA5; ISSN 0361-5235
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
COPPER
CREEP
ELECTRON MICROSCOPY
ELEMENTS
EUTECTICS
INDIUM ALLOYS
JOINTS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL
SCANNING ELECTRON MICROSCOPY
SOLDERED JOINTS
STRESSES
TIN ALLOYS
TRANSITION ELEMENTS