Annealed oxygen-free and tough-pitch copper samples have been processed by equalchannel
angular pressing (ECAP) by route BC. The samples included 8 x 8 mm section pieces and a
40 mm diameter bar. Thermal stability was assessed based on the changes in the standard
mechanical properties (conventional yield strength, tensile strength, elongation, proportional
elongation and contraction) after annealing at different temperatures for 1 hour.
Thermal stability of the same grade of material has been found to be different for different
batches and to depend on the structural conditions of deformed material. The zone of thermal
stability for copper of the two grades of interest does not depend on the material’s chemical
composition.
Titanium VT1-0 was processed by four passes of equal-channel angular pressing (ECAP) using two routes, BC and C. Pressed samples had a square section with a side length of 8 mm. Mechanical properties at tension (tensile strength, conventional yield strength and elongation) were determined at 9 points across the sample using small-size specimens, 1.5 mm in diameter, cut out along the pressing direction. Heterogeneity in the mechanical properties across the sample was determined based on the value of the variation coefficient. One can observe that heterogeneity in the mechanical properties generally tends to decrease with the number of ECAP passes.
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