Browsing by Author "Davidson, CJ"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- ItemNeutron diffraction determination of macro and microstresses in an Al-Si-Mg composite and observed changes with plastic strain(Australian Institute of Physics, 2012-02-02) Davidson, CJ; Finlayson, TR; Griffiths, JR; Luzin, V; Wang, QG; Rajakesari, J; Llorca, JNeutron diffraction has been used to measure macro- and microstress components as functions of position within tension and compression samples of an Al-Si-Mg composite. The influences on these components of both tensile and compressive plastic deformation have been studied. Deformation to about 1.5% plastic strain (for both tension and compression) relieves the macrostress and most of the thermal microstress but sets up new residual microstresses. The results for the microstresses measured for the silicon phase following plastic deformation and unloading, are compared with the predictions of a finite-element model for the micromechanical behaviour of the alloy.
- ItemResidual stress in metal-matrix composite cylinder measured by neutron diffraction and contour method(Materials Research Forum LLC, 2016-07-03) Luzin, V; Thorogood, KJ; Griffiths, JR; Davidson, CJ; Finlayson, TRA cylindrical sample, 14.8 mm in diameter, was machined from an Al-Mg-Si casting and then heat-treated. For the purposes of this research, the casting can be regarded as a two-phase composite of aluminium and 6 vol.% of near-spherical Si particles ~3 μm in diameter. Residual stresses in the cylinder are (i) long-range macrostresses resulting from the transient temperature gradients formed during heat-treatment, and (ii) short-range microstresses resulting from differences in the coefficients of thermal expansion between Al and Si. Neutron diffraction has been used to measure the stress tensors in each phase of the composite as a function of radial position with 2 mm spatial resolution and the microstress and macrostress components have been successfully separated. The contour method was applied to measure the axial component of the macrostress and the results are in good agreement with the neutron diffraction data. © The Authors