Mechanisms of Fracture and Creep of Structural Alloys
Annual rept. 1 Jan 92-28 Feb 93,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Progress is reviewed for a research which focuses on two aspects which limit the performance of structural alloys. First, in a study generic to a wide range of materials, we are determining the mechanisms, as well as local failure criteria, by which voids grow, interact and link during ductile fracture due to damage accumulation. Secondly, in a study focused specifically at high strength titanium alloys, we are examining the deformation and fracture behavior of novel beta titanium alloy Ti-23Nb-11Al, which is age-hardenable by the formation of ordered precipates based on Ti3Al. Progress for the period January 1, 1992 to February 28, 1993 is reviewed for the following projects 1 two- dimensional modeling studies of void linking during ductile, microvoid fracture, 2 a three-dimensional experimental modeling study void growth and linking during ductile fracture, and 3 the influence of temperature on the deformation and oxidation behavior of a new age-hardenable beta titanium alloy.
- Properties of Metals and Alloys