9:30 AM - 9:45 AM
[SIT21-03] Uniaxial deformation experiments of bridgmanite using D-111 type high pressure apparatus
Keywords:Bridgmanite, Deformation experiments, Creep strength
In-situ measurements were conducted using MAX III with D111 type guide block at PF-AR NE7A beam line. Mg-pure bridgmanite aggregates were used as starting material. Experimental conditions are 1473-1673 K and 24-27 GPa. WC second cubic anvils with cone (6.5°) to take 2D X-ray diffraction, was used along X-ray path. Two-dimensional X-ray diffraction patterns were corrected for 240 s using flat panel detector. To calculate pressure and the stress magnitude of bridgmanite, (112) X-ray diffraction peaks were used. Strain of bridgmanite was measured by X-ray radiographies taken using an imaging system composed of a YAG crystal and a CMOS camera.
Largest strain was reached to approximately 20 %. It is confirmed that strain rate can be well controlled using stroke speed of differential rams. Steady state creep were observed at 1473 K – 1673 K and 5 × 10-6 – 3.8 × 10-5 /s. At normalized strain (10-5 /s), the creep strength of bridgmanite in this study is the largest in constituent mantle minerals reported by D-DAI apparatus.