Large tensile elongation behavior of Fe-14 at.% Si single crystal
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
A large tensile elongation reaching 180% is observed in Fe{sub 3}Si single crystal with the B2 structure at temperatures of 0.65--0.74T{sub m}, and at initial strain rates of 10{sup {minus}4}--10{sup {minus}3}/s. The large tensile elongation takes place at a steadily increased flow stress with increasing strain. The mechanical parameters evaluated for a constitutive equation show that the strain rate sensitivity is as large as 0.38 and the apparent activation energy ranges from 230 to 280 kJ/mol. The deformation microstructure responsible for the large tensile elongation consists of subgrain microstructure, and indicates that glide and climb motions of the {l_angle}111{r_angle}-type dislocations are concomitantly operating. It is suggested that comparable work hardening (by the glide motion of dislocations) with the dynamic recovery (by the climb motion of dislocations) takes place, and leads to a steadily increased flow stress and favorable value of strain rate sensitivity, resulting in large plastic elongation and high fracture resistance.
- OSTI ID:
- 289521
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 16 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
Similar Records
The mechanical properties of Fe-36.5Al and its Cr or Ti containing alloys at elevated temperature
{l_angle}100{r_angle} Burgers vector in single phase {gamma}{prime} material verified by image simulation