Novel Aluminum Alloys for Very High Temperature Applications

Project: Research project

Project Details

Description

The goal of this project is to develop an Al superalloy with high strength for very high temperature applications, without deteriorating the low temperature strength significantly due to grain coarsening, to uncover the fundamentals of fracture and fatigue mechanisms, and develop computational models and tools that support material development and processing. The proposed work will focus on the following objectives:

1. Develop Al-Sc-Er-Zr-G5 alloys with relatively coarse-grained structure to obtain highly creep-resistant Al alloys up to 450°C.
2. Investigate the mechanical properties of Al superalloy systems developed using cast and rolled materials and analyze microstructure and evolution of the mechanical properties during thermo-mechanical treatment.
3. Investigate the temperature- and rate-sensitive damage accumulation at the stress states encountered in the fracture and fatigue behavior investigations.
4. Manipulate the microstructure of the developed alloy studied in Objective 1 using thermally-aided severe plastic deformation (SPD) and simulation-based design of processing routes and parameters to achieve desired textures, special grain boundary character distribution, formability and ultrahigh specific strength. Investigate the role of ultrafine grain structure and grain boundary character distribution on the precipitate growth and distribution, low temperature strength and ductility, and high temperature stability.
5. Develop a constitutive model and fatigue criteria coupling microstructural features and their evolution to macroscopic behavior and implement the model into a numerical tool for large scale applications.
StatusFinished
Effective start/end date2/1/157/1/18

Funding

  • Texas A&M Engineering Experiment Station (C710S1//NPRP 7-756-2-284)
  • Qatar National Research Fund (C710S1//NPRP 7-756-2-284)

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