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INFLUENCE OF CRYSTALLOGRAPHIC ORIENTATION AND LAYER THICKNESS ON FRACTURE BEHAVIOR OF Ni/Ni3Al
 

Summary: INFLUENCE OF CRYSTALLOGRAPHIC ORIENTATION AND
LAYER THICKNESS ON FRACTURE BEHAVIOR OF Ni/Ni3Al
MULTILAYERED THIN FILMS
Rajarshi Banerjee, Jason P. Fain, Peter M. Anderson and Hamish L. Fraser
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road,
Columbus, OH 43210, USA
(Received October 25, 2000)
(Accepted in revised form February 7, 2001)
Abstract--Ni / Ni3Al multilayers have been deposited epitaxially and non-epitaxially by UHV
magnetron sputtering on 001 NaCl substrates. Two interfacial orientations were achieved: {001}
Ni // {001} Ni3Al, 100 Ni // 100 Ni3Al and {111} Ni // {111} Ni3Al, 110 Ni // 110
Ni3Al. Under in-plane tensile loading, 001 oriented multilayers exhibit ductile fracture surface
features but 111 oriented multilayers of the same layer thickness are predominantly brittle. For
each orientation, the fracture surface features from 20 nm thick Ni and Ni3Al layers appear to be as
ductile or more ductile than those from 120 nm thick layers, but the plastic deformation appears to
be more localized. 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights
reserved.
Introduction
Nickel-base superalloys are used extensively in the aerospace industry, due to excellent mechanical
properties such as yield strength and creep resistance at elevated temperatures [1]. The metal-

  

Source: Anderson, Peter M. - Department of Materials Science and Engineering, Ohio State University

 

Collections: Materials Science