Two previously under formed specimens of the same metal are to be plastically deformed by reducing their cross-sectional areas. One has a circular cross section, and the other is rectangular; during deformation the circular cross section is to remain circular, and the rectangular is to remain as rectangular. Their original and deformed dimensions are as follows:

Which of these specimens will be the hardest after plastic deformation, and why?

Transcribed Image Text:

Circular (diameter, mm) Rectangular (mm) 20 x 50 13.7 x 55.1 Original dimensions Deformed dimensions 18.0 15.9