Fracture of polycrystalline MgAl/sub 2/O/sub 4/.

Author: Stewart, R. L.
Published: United States : [publisher not identified], 1979.
Springfield, Va. : National Technical Information Service, [approximately 1979]
Physical Description: microfiche : negative ; 11 x 15 cm
Additional Creators: Bradt, R. C.

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Summary

The fracture toughness of stoichiometric polycrystalline MgAl/sub 2/O/sub 4/ was measured as a function of grain size and temperature to 1400/sup 0/C. The room temperature K/sub Ic/'s are comparable to reported single crystal values. No effect of grain size was detected. Two regions of K/sub Ic/ = f(T) were observed, both are a decreasing K/sub Ic/ with an increasing T. In the low temperature region, fracture is of a mixed mode, transgranular and intergranular character and the (dK/sub Ic//dT) decrease is governed primarily by (dE/dT). The high temperature region, T > 900/sup 0/C, has a much larger (dK/sub Ic//dT) decrease, and a fracture character that is totally intergranular, suggesting dominance by grain boundary processes.

Report Numbers

CONF-780545-11

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NTIS collection.

Note

DOE contract number: AS02-76ER03420
OSTI Identifier 5380537
Research organization: Pennsylvania State Univ., University Park (USA). Dept. of Materials Science and Engineering.

Funding Information

Sponsored by USDOE Chicago Operations Office (CO).

View MARC record | catkey: 45333690

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Fracture of polycrystalline MgAl/sub 2/O/sub 4/.

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