| Autor: |
Jankowski, A.F., Chames, J.M., Gardea, A., Nishimoto, R., Brannigan, E.M. |
| Zdroj: |
International Journal of Materials Research: Zeitschrift fuer Metallkunde; November 2019, Vol. 110 Issue: 11 p990-999, 10p |
| Abstrakt: |
The strain-rate sensitivity exponent mand activation volume υ∗are often used to characterize the strain-rate sensitivity of strength behavior in metals and alloys. Complications can arise when the mand υ∗values become indeterminate, due to factors such as an inherent scatter in the mechanical property data. The study of commercial Ti-alloy wires is considered wherein to overcome this limitation, the formulation of the Kocks–Mecking (K–M) model is modified to provide a parameter cbthat characterizes the microstructural scale responsible for the observed plasticity and work hardening behavior. The softening factor cbis found to be independent of strain-rate for the Ti-alloy wires of this study. It is proposed that cb!can offer a versatile and complementary computation to the activation volume υ∗since its formulation includes the yield and ultimate strength values along with the plastic strain. For the tensile testing of Ti-alloy wires, a low cb-value of 14 is calculated for Ti-6Al-4V that is consistent with >10 % plasticity during work hardening whereas a high cb-value of 135 for Ti-6Al-7Nb corresponds with <4 % plasticity. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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