Abstract
The relationship between low cycle fatigue (LCF) and monotonic tensile fracture strain was investigated for cast Al-Cu-Mn-Zr alloys containing 6 and 9 wt% Cu at 250 °C. The 9% Cu alloy consisted of larger size and volume fraction of brittle intermetallic grain boundary particles that fractured during tensile tests to reduce the fracture strain by 50% compared to the 6% Cu alloy. LCF life was similar between the two alloys and weakly influenced by the particles. LCF life and fracture strain were poorly correlated due to the dominant influence of particles on monotonic tensile crack but not on fatigue crack.
| Original language | English |
|---|---|
| Article number | 105836 |
| Journal | International Journal of Fatigue |
| Volume | 140 |
| DOIs | |
| State | Published - Nov 2020 |
Funding
Research sponsored by Powertrain Materials Core Program, under the Propulsion Materials Program (managed by Jerry Gibbs), Vehicle Technologies Office , U.S. Department of Energy . The authors thank Andres Rodriguez and Alex Gonzalez of Nemak SA for providing the alloys. Dana McClurg, Shane Hawkins, Kelsey Hedrick, and Tom Geer are acknowledged for their technical assistance. Jason Allen and Richard Michi are thanked for technical review of the manuscript.
| Funders | Funder number |
|---|---|
| Jerry Gibbs), Vehicle Technologies Office | |
| Powertrain Materials Core Program | |
| U.S. Department of Energy |
Keywords
- Cast aluminum alloys
- Finite element modeling
- Fracture strain
- Low cycle fatigue
- Tensile test