Pressure-Induced Crystal-Structure Transition in Fe-Cr Alloys
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 7
Abstract
Elemental Iron undergoes crystal-structure transition from bcc (Im-3m space group) to hcp (P63/mmc space group) structure type under the pressure of 13 GPa. With increasingCr-concentration, the structure transition is shifted to higher pressures (e.g. 18 GPa for Fe70Cr30). For Cr-concentrations higher than 47 % we did not see any traces of the phase transition probably because the maximum pressure used (35 GPa) was not high enough to induce the structure transition in the alloys. After releasing the pressure, the cubic symmetry is restored.The Bulk modulus is increasing from 160 GPa (elemental Fe) with increasing Cr concentration up to approx. 30 % Cr. Then it starts to decrease again followed by another increase and subsequent decrease represented by a double-peak dependence on Cr concentration.Hydrogen exposure of Fe80Cr20, resulting in negligible H absorption to the surface layers, does not bring any significant changes to the crystal-structure properties.
Authors and Affiliations
Amir Broide, Oleg Rivin, Silvie Maskova, Matthew S. Lucas, Itzhak Orion, Shai Salhov, Michael Shandalov, Antonio F. Moreira Dos Santos, Jamie Molaison, Zhiqiang Chen
Keywords
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