High temperature deformation behaviour of MoSi2 and WSi2 single crystals |
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Authors: | K Kimura M Nakamura T Hirano |
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Affiliation: | (1) Tsukuba Laboratory, National Research Institute for Metals, Tsukuba, 305 Ibaraki, Japan;(2) Present address: Environmental Performance Division, National Research Institute for Metals, 2-3-12 Nakameguro, Meguro, 153 Tokyo, Japan |
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Abstract: | High temperature deformation behaviour of MoSi2 and WSi2 single crystals, which both oriented near 001 and near 100 , have been studied by compression tests over the temperature range of 1100 to 1500° C in a high vacuum of less than 6×10–4 Pa. At elevated temperatures, several per cent compression deformation is possible in both MoSi2 and WSi2. Slips on {110 and {013 planes, the dislocation with the direction of Burgers vector 331 and the stacking fault on {110 plane are observed in both deformed MoSi2 and WSi2. In MoSi2, the 0.2% offset stress of the sample oriented <001> is higher than that of the sample oriented <100>. The higher strength of the sample oriented <001> is related to the higher CRSS for the main slip plane of it. The reverse orientation dependence of the strength in WSi2 is also correlated with the difference in CRSS on {110 and {013 planes, which shows the opposite result to MoSi2. The higher CRSS on {110 plane in WSi2 compared to that on {013 may be caused by the formation of a large number of stacking faults on {110 plane. |
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