In situ phase transformation and deformation of iron at high pressure and temperature Available to Purchase

With a membrane based mechanism to allow for pressure change in a sample in a radial diffraction diamond anvil cell and simultaneous infrared laser heating, it is now possible to investigate texture changes during deformation and phase transformations over a wide range of temperature-pressure conditions. The device is used to study bcc $(α)$⁠, fcc $(γ)$⁠, and hcp $(ε)$ iron. In bcc iron, room temperature compression generates a texture characterized by (100) and (111) poles parallel to the compression direction. During the deformation induced phase transformation to hcp iron, a subset of orientations is favored to transform to the hcp structure first and generate a texture of $(011¯0)$ at high angles to the compression direction. Upon further deformation, the remaining grains transform, resulting in a texture that obeys the Burgers relationship of $(110)bcc//(0001)hcp$⁠. Contrary to these results for low temperature, at high temperature texture is developed through dominant pyramidal $⟨a+c⟩$ ${21¯1¯2}$ $⟨21¯1¯3⟩$ and basal (0001)$⟨21¯1¯0⟩$ slip based on polycrystal plasticity modeling. We also observe that the high temperature fcc phase develops a 110 texture typical for fcc metals deformed in compression.