The orientation and temperature dependences of dislocation velocity in Ni 3 Al single crystals |
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Authors: | Z F Zhang C B Jiang S D Wu S Patu |
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Institution: | Shenyang National Laboratory for Materials Science Institute of Metal Research , Chinese Academy of Sciences , Shenyang, 110016, PR China |
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Abstract: | The average velocities of screw dislocations in Ni 3 Al single crystals have been directly measured as a function of resolved shear stress (RSS) and orientation in the temperature domain of the flow stress anomaly using the etch-pit technique. The velocity was found to be extremely sensitive to the RSS in all cases. In contrast with ordinary metals, the screw dislocation velocities in Ni 3 Al show anomalous behaviour; under a constant RSS, the velocities decrease dramatically with increasing temperature. Furthermore, the velocities and the tension-compression asymmetry of the velocities depend on the orientation of applied stress. |
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Keywords: | TRIP/TWIP steel martensitic transformations intersection reactions EBSD Schmid's law crystallography |
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