Project Team
Students
Neil Lerch
Mechanical Engineering
Penn State Harrisburg
Faculty Mentors
Ahm Rahman
Penn State Harrisburg
Mechanical Engineering
Allison Beese
Penn State University Park
Materials Science & Engineering
Project
https://sites.psu.edu/mcreu/files/formidable/2/RRA-Example.pdf
Project Video
Project Abstract
Various forms of heat treatment have been proven to enhance properties of metals. Among them is the process of retrogression and re-aging (RRA). As a relatively new process, the effects of RRA have not been fully documented for many alloys. This research aims to help fill that gap by fully documenting the effects of RRA on mechanical properties, including tensile strength and microhardness, as well as on the microstructure surrounding the grain boundaries in samples of aluminum alloy 7075. Methods used will include testing various retrogression temperatures with the retrogression time, as well as the time and temperature for the aging and re-aging processes being set. An ideal outcome would show enhancements in the mechanical properties of the metal as well as a higher precipitate concentration along the grain boundaries.
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