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Figure 5
(a) Differential stress versus time as measured with a white X-ray beam within the alumina pistons compressing a forsterite sample in the D-DIA at the indicated P and T conditions. Exploitable alumina hkl peaks are indicated. Discrepancy in stress measurements at a given time results from both accuracy on the measurement and the properties of the stressed alumina polycrystal. Average differential stress t values are indicated for each steady-state regime of deformation. (b) Corresponding strain versus time plots as measured by X-ray radiography (§3.4[link]) of the forsterite sample. Steady-state deformation translates here by constant strain rates (indicated slopes).

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