| Abstrakt: |
The plastic anisotropy of Ti-6Al-4 V was examined after various thermomechanical treatments, including heat treating, rolling, and forging. Processing temperatures were varied from room temperature to 1340 K. The anisotropy, in terms of the strain ratioR, was measured by post-yield strain gages in the three principal directions, and results were correlated with the (0002) pole figures for each thermomechanical treatment. The plastic strain anisotropy, which was consistent with the basal pole orientation, was found to depend upon both the method and the temperature of mechanical working. The greatestRvalues occurred for the cold-rolled material where the basal poles rotate to within 15 deg from the sheet normal. In addition,Ris not constant under uniaxial tension, but generally increases with the amount of plastic strain. The variation ofRwith uniaxial strain depends upon the forming temperature, and the largest changes occur in samples that were rolled at room temperatures. |
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