Fracture toughness of intermetallics using a micro-mechanical probe

W. W. Gerberich, S. K. Venkataraman, J. W. Hoehn, P. G. Marsh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

A novel technique for determining the fracture toughness of brittle intermetallics is presented, wherein very small samples are used and multiple tests are easily conducted on a flat polished surface. The fracture toughness of single crystal NiAl and polycrystalline Al3Sc are evaluated with this continuous microscratch technique at scratch rates ranging from 0.5 to greater than 100 μm S-1. For comparison, small compact tension samples of {100} 〈100〉 NiAl are evaluated at applied stress intensity rates ranging from 1.5 to 5400 MPa-m 1/2 s-1. Good comparison of microscratch toughness to compact tension KIc values are obtained in this study for {001} 〈100〉 NiAl, 10.6 vs. 10.0 MPa-m 1/2 , from the literature for {001} 〈110〉, 13.5 vs. 12.2 MPa-m 1/2 , and from the literature for polycrystalline Al3Sc, 3.5 vs 3.1 MPa-m 1/2 . Also, the fracture toughness of both NiAl and Al3Sc are found to be strongly dependent on strain rate at room temperature with toughness dropping by an order of magnitude over a decade increase in rate. Possible reasons and implications to improving low temperature brittleness are discussed.

Original languageEnglish (US)
Title of host publicationProc First Int Symp Struct Intermet
EditorsR. Darolia, J.J. Lewandowski, C.T. Liu, P.L. Martin, D.B. Miracle, al et al
PublisherPubl by Minerals, Metals & Materials Soc (TMS)
Pages569-576
Number of pages8
ISBN (Print)0873392531
StatePublished - Dec 1 1993
EventProceedings of the First International Symposium on Structural Intermetallics - Champion, PA, USA
Duration: Sep 26 1993Sep 30 1993

Publication series

NameProc First Int Symp Struct Intermet

Other

OtherProceedings of the First International Symposium on Structural Intermetallics
CityChampion, PA, USA
Period9/26/939/30/93

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