Yield strength and brittle-to-ductile transition of boron-nitride and gallium-nitride

Journal Article · Fri Aug 20 00:00:00 EDT 1999 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00192-X· OSTI ID:691314

Kamimura, Y; Kirchner, H O.K. ^[1]; Suzuki, T ^[2]

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1. Univ. of Tokyo (Japan). Inst. of Industrial Science
2. Univ. Paris-Sud, Orsay (France). Institut de Sciences des Materiaux

Boron-nitride and gallium-nitride with cubic (zincblende) structure are industrial materials with great potential. The only mechanical parameters that have been measured are the Vickers and Knoop hardnesses of cubic boron-nitride (c-BN), 49 GPa and 43 GPa, respectively. They are larger than the values for SiC. No hardness values of c-GaN have been published. This paper predicts the temperature dependence of the critical shear stress {tau}{sub c} and the brittle-to-ductile transition (BDT)-temperature of c-BN and c-GaN by use of the universal relation which was recently found for tetrahedrally bonded crystals.

• OSTI ID: 691314
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 41; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON NITRIDES
BRITTLE-DUCTILE TRANSITIONS
BRITTLENESS
GALLIUM NITRIDES
STRESSES
TEMPERATURE DEPENDENCE
YIELD STRENGTH