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

Conference · Wed Nov 22 00:00:00 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. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7073662
• Report Number(s): UCRL-102284; CONF-900425-4; ON: DE90006925
• Resource Relation: Conference: 4. international conference on creep and fracture of engineering materials and structures, Swansea (UK), 1-6 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

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