Plane strain compression of copper, Cu 6wt Pct Al, and Ag 4wt pct Sn crystals
Tóm tắt
Crystals of various orientations were forced to undergo plane-strain compression to simulate the deformation of a grain in a polycrystalline aggregate. Copper, Cu−6wt pct Al, and Ag−4wt pct Sn were studied to evaluate the influence of stacking fault energy on the model of G. I. Taylor which assumes equal hardening on all slip systems. The compression stress strain (σ−∈) curves were converted to resolved shear-stress: shear-strain (τ−γ) using the appropriate Taylor factor. A quantitative analysis of lattice rotation during deformation was made and found to be in agreement with the orientation change determined with the aid of X-ray pole figures. The change in Taylor factor associated with the reorientation was computed and used in constructing the τ−γ curves. Additional information on the active slip and twin systems was provided by optical metallography. The τ−γ curves generally fell into a narrow band for all these materials, indicating that the assumption of equal hardening was reasonably valid for low stacking fault energy alloys under conditions of multiple slip imposed in the present experiment. Deviations occurred mainly in the alloy crystals which exhibited mechanical twinning. Nevertheless, the active twin systems in these crystals were satisfactorily predicted by an extended Taylor analysis.
Tài liệu tham khảo
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