Time-dependent failure of silver-interlayer diffusion bonds between non-deforming base-metals

Conference · Wed Nov 22 04:00:00 EST 1989

OSTI ID:7073662

Kassner, M. E.; Rosen, R. S.; Henshall, G. A. ^[1]; Challenger, K. D. ^[2]

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1. Lawrence Livermore National Lab., CA (USA)
2. Cincinnati Univ., OH (USA). Dept. of Materials Science and Engineering

Silver-interlayer diffusion-bonds, fabricated at low temperatures using planar-magnetron sputtering, exhibit very high tensile strengths. Earlier work has shown that these joints undergo delayed failure at relatively low tensile stresses at ambient temperature for the case in which plasticity occurs in the base materials. Failure apparently occurs by a microvoid coalescence mechanism at the bond interfaces. Delayed tensile failures were investigated in this study for the case in which the applied stress does not produce any plastic deformation in the base metal. Failure occurs and appears to be controlled by time-dependent plasticity within the silver interlayer, which is governed by the effective stress in the interlayer. The plasticity causes cavity nucleation and, eventually, interlinkage and failure. These findings are believed to be generally applicable to any thin interlayer bond, including those prepared by processes different than physical vapor-deposition. 25 refs., 5 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7073662
• Report Number(s): UCRL-102284; CONF-900425--4; ON: DE90006925
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CAVITIES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CREEP
DEFORMATION
DEPOSITION
DIFFUSION
ELEMENTS
FAILURES
INTERFACES
IRON ALLOYS
IRON BASE ALLOYS
MARAGING STEELS
MARTENSITIC STEELS
MECHANICAL PROPERTIES
METALS
PLASTICITY
SILVER
STEELS
SURFACE COATING
TENSILE PROPERTIES
TIME DEPENDENCE
TRANSITION ELEMENTS