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Determination of the Fracture Toughness of the Niobium/Sapphire Interface

Published online by Cambridge University Press:  10 February 2011

H. JI ,
G. S. WAS  and
M. D. Thouless
H. JI
Affiliation:
Physics Department
G. S. WAS
Affiliation:
Department of Materials Science & Engineering Department of Nuclear Engineering & Radiological Sciences
M. D. Thouless
Affiliation:
Department of Mechanical Engineering and Applied Mechanics all at the University of Michigan, Ann Arbor, MI 48109
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Abstract

In this work, the effect of composition and crystal orientation relationship on theinterface fracture toughness of niobium/sapphire system was studied. Interfaces were synthesized by either physical vapor deposition or ion beam assisted deposition. Silver was deposited to weaken the interface and crystal orientation was used to strengthen it. Several techniques were used to assess the interface fracture toughness, including microscratch, nanoindentation, microwedge scratch, and delamination of patterned lines. Results showed a general trend in which the interface fracture toughness decreased with the amount of silver. Ion bombardment during film deposition significantly increased the interface fracture toughness through a combination of interface mixing and a controlled orientation relationship.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 325
Copyright
Copyright © Materials Research Society 1998

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