Abstract
The effects of various levels of superimposed hydrostatic pressure on the tensile ductility and fracture micromechanisms were determined for 6061 specimens heat-treated to underaged and overaged conditions of equivalent yield strength. Superimposed pressures of 0.1, 150, and 300 MPa were selected; the ductility increased between 0.1 and 150 MPa and remained constant between 150 and 300 MPa. It is shown that the levels of pressure chosen inhibit void growth and coalescence. Void nucleation occurred at nonmetallic inclusions, and neither the ductility nor pressure response were significantly affected by the heat treatments chosen.
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