TY  - JOUR
A1  - Fernandez, Ricardo
A1  - Gonzalez-Doncel, Gaspar
A1  - Garces, Gerardo
A1  - Bruno, Giovanni
T1  - Towards a comprehensive understanding of creep
BT  - microstructural dependence of the pre-exponential term in Al
JF  - Materials science & engineering. A, Structural materials: properties, microstructure and processing
N2  - We show that the equation proposed by Takeuchi and Argon to explain the creep behavior of Al-Mg solid solution can be used to describe also the creep behavior of pure aluminum. In this frame, it is possible to avoid the use of the classic pre-exponential fitting parameter in the power law equation to predict the minimum creep strain rate. The effect of the fractal arrangement of dislocations, developed at the mesoscale, must be considered to fully explain the experimental data. These ideas allow improving the recently introduced SSTC model, fully describing the primary and secondary creep regimes of aluminum alloys without the need for fitting. Creep data from commercially pure A199.8% and Al-Mg alloys tested at different temperatures and stresses are used to validate the proposed ideas.
KW  - creep
KW  - Aluminum alloys
KW  - dislocations
KW  - fractal
KW  - stress exponent
Y1  - 2020
U6  - https://doi.org/10.1016/j.msea.2020.139036
SN  - 0921-5093
SN  - 1873-4936
VL  - 776
PB  - Elsevier
CY  - Lausanne
ER  -