Abstract
The effects of various levels of superimposed hydrostatic pressure on the tensile ductility and fracture micromechanisms were determined for 6061 + 15 pct Al203 composites heat-treated to underaged (UA) and overaged (OA) conditions of equivalent yield strength. Superimposed pressures of 0.1, 150, and 300 MPa were selected, while the ductility significantly increased with each increment in pressure. At 300 MPa pressure, the monolithic 6061 and 6061 composite exhibited nearly identical ductility. It is shown that the levels of pressure chosen significantly inhibit void growth and coalescence in the composite. Void nucleation in the composites occurredvia the fracture of the reinforcement, followed by void growth and coalescence in the matrix. Tests conducted with 500 MPa pressure additionally provided evidence for suppression of void nucleation. Neither the ductility nor the pressure response was significantly affected by the heat treatments chosen.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
