Two previously undeformed 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 rectangular. Their original and deformed dimensions are as follows:
| Circular (diameter, mm) | Rectangular (mm) |
Original dimensions | 18.0 | 20 × 50 |
Deformed dimensions | 15.9 13.7 × 55.1 |
|
Which of these specimens will be the hardest after plastic deformation, and why?
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