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The α-γ-εtriple point and phase boundaries of iron under shock compression
- Source :
- Journal of Applied Physics. 122:025901
- Publication Year :
- 2017
- Publisher :
- AIP Publishing, 2017.
-
Abstract
- The phase transition of iron under shock compression has attracted much attention in recent decades because of its importance in fields such as condensed matter physics, geophysics, and metallurgy. At room temperature, the transition of iron from the α-phase (bcc) to the e-phase (hpc) occurs at a stress of 13 GPa. At high temperature, a triple point followed by transformation to the γ-phase (fcc) is expected. However, the details of the high-temperature phase transitions of iron are still under debate. Here, we investigate the phase-transition behavior of polycrystalline iron under compression from room temperature to 820 K. The results show that the shock-induced phase transition is determined unequivocally from the measured three-wave-structure profiles, which clearly consist of an elastic wave, a plastic wave, and a phase-transition wave. The phase transition is temperature-dependent, with an average rate Δσtr/ΔT of −6.91 MPa/K below 700 K and −34.7 MPa/K at higher temperatures. The shock α-e and α-γ p...
- Subjects :
- Phase transition
Materials science
010504 meteorology & atmospheric sciences
Condensed matter physics
Triple point
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
Compression (physics)
01 natural sciences
Shock (mechanics)
Stress (mechanics)
Crystallography
Phase (matter)
Quantum critical point
Crystallite
0210 nano-technology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........3a49047a775ca6e3fa6849e52ae983f2