KNOOP HARDNESS ANISOTROPY ON left brace 001 right brace FACES OF GERMANIUM AND GALLIUM ARSENIDE.
Knoop hardness measurements have been carried out as a function of azimuthal angle and temperature (in the range 20 degree -440 degree C) on left brace 001 right brace faces of n-type, p-type, and intrinsic Ge and GaAs. The degree of hardness anisotropy shown increases with increasing temperature an...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1986
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| Summary: | Knoop hardness measurements have been carried out as a function of azimuthal angle and temperature (in the range 20 degree -440 degree C) on left brace 001 right brace faces of n-type, p-type, and intrinsic Ge and GaAs. The degree of hardness anisotropy shown increases with increasing temperature and for Ge is undetectable below a certain temperature which depends on doping. In GaAs, asymmetry in hardness between left bracket 110 right bracket and left bracket 11 OVER BAR 0 right bracket directions was found at high temperatures. A new model of hardness anisotropy has been developed, based on detailed modeling of the plastic zone. This relates the hardness to the degree of workhardening in different regions of the plastic zone. Using this model, detailed explanations are given of the hardness anisotropy behavior and of the plastic recovery around indentations. |
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