|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||I-4: Creep Behavior of Cast Aluminum-Copper Alloys at 300° C
||Brian Milligan, Shibayan Roy, Shane Hawkins, Patrick Shower, Amit Shyam
|On-Site Speaker (Planned)
As aluminum alloys are utilized at higher homologous temperatures, creep deformation becomes an important aspect of their mechanical behavior. The creep behavior of four Al-Cu alloys was studied at 300° C by measuring their steady state creep rate as a function of stress. The dominant creep mechanisms were identified for multiple stress regimes. For some alloys, diffusional creep was the dominant deformation mechanism at low stresses. The rate of diffusional creep deformation was dependent on grain size and the fraction of grain boundary area covered by precipitates. A modified version of the Coble creep model was developed to explain the observed diffusional creep behavior, and it provided a good fit to the experimental creep data. The fracture mode of the investigated alloys was dependent on the relative strength of the grain boundary region compared to the grain interior.
||Planned: Light Metals