Faculty Advisor

Sisson, Richard D.


Cold sprayed Al 6061 alloy test samples were heat treated at several solutionizing and aging temperatures, and aging times to determine the effect of heat treatment on microstructure and hardness. Vickers and Knoop microhardness values as well as scanning electron microscope images were compared to determine the effects of heat treatments on the hardness and microstructure. Overall the heat treatments caused a decrease in hardness values in all of the samples, with the largest decrease being 47% from the as sprayed control sample. The highest hardness value and largest growth of precipitates was recorded after 1 hour of heat treatment at 200°C with a growth in precipitates of approximately 30%.


Worcester Polytechnic Institute

Date Accepted

April 2012


Mechanical Engineering

Project Type

Major Qualifying Project



Advisor Department

Mechanical Engineering