open access

https://hdl.handle.net/2115/75130

The Effect of Strain Rate on the Flow Stress of Ni3(Al, Ti) Single Crystals

日本語

high temperature deformation

1987-05-01

日本金属学会

Journal of the Japan Institute of Metals

51(5)

400-406

Single crystals of Ni3(Al, Ti) with selected orientations were deformed in compression at temperatures between 77 K and 1223 K with strain rates varying from 1.4×10−5 to 1.4×10−2 s−1, in order to investigate the effect of strain rate on the flow stress. Results obtained are as follows: In the intermediate temperature range where the strength increases anomalously with increasing temperature, the strain rate dependence of flow stress is very weak. This phenomenon is likely to be characteristic of intermetallic compounds with L12 structure which show positive temperature dependence of strength. On the other hand, in the higher temperature range where the flow stress decreases gradually and {100} slip occurs predominantly, the strength is very sensitive to the strain rate and shows a normal strain rate dependence. Judging from the magnitudes of activation energy and activation volume for higher temperature deformation, it is concluded that {100} slip is controlled by the Peierls-Nabarro mechanism. Equations to relate flow stress and strain rate for {100} slip are derived, and they well account for the experimental results at all strain rates tested.

学術雑誌論文

Version of Record

0021-4876

1880-6880

AN00062446