Abstract
The behavior of aluminum under high pressures and temperatures was investigated by in situ time-of-flight neutron diffraction with a developed Toroidal Anvil Press (TAP-98). The effect of the displacement of the center of diffraction, which is caused by sample movement during compression, is corrected by an additional calibration. Unit-cell dimensions, measured up to P=5.7 GPa and T=900 K, were derived from the refinement results and fitted to the high-temperature Birch–Murnaghan equation of state. With (∂KT/∂P)T fixed at 4, we obtained K0=72.8(±2.4) GPa, (∂KT/∂T)P=−0.04(±0.01) GPa K−1, and αT (K−1)=3.7(±1.6)×10−5+9.7(±3.5)×10−8T. Our data are compared with previous experimental data involving shock wave, static compression, ultrasonic, and thermal-expansion measurements and with theoretical predictions. The results demonstrate that the newly developed high-pressure high-temperature system for in situ neutron diffraction is reliable. It was also found that the crystalline orientation of Al grains became highly preferred when the sample was heated to 900 K at ∼4 GPa.
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