عنوان مجله
|
JOURNAL OF ALLOYS AND COMPOUNDS
|
چکیده
|
This study challenges experimentally, the feasibility of new severe plastic deformation method entitling
planar twist channel angular extrusion (PTCAE) for fabrication of nanostructure pure copper. The results
indicated, deformed copper has 71%, 69% and 113% higher yield strength, ultimate tensile strength and
hardness magnitude as compared to the as-received condition. Additionally, the fractography of tensile
sample showed the mechanism alteration from multiple dimples to cleavage planes, associating the
production of brittle type material. Moreover, the reduction of bulk formability index of the processed
copper in comparison with the initial condition confirms the decrease of material ductility due to the
strain hardening and grain refinement phenomena. The grain size of about 270 nm is also attained after
the single pass processing. Eventually, a grain size correction coefficient is proposed to the strength to
hardness ratio as a rule of thumb for estimation of strength by means of hardness irrespective of the
grain size of the pure copper material.
|