Fracture Toughness,Aging Behavior,Grain Growth,and Hardness of Alpha-Beta Titanium Alloys.

摘要

The fracture toughness of Ti-5.25Al-5.5V-0.9Fe-0.5Cu was studied for equiaxed alpha-aged beta structures heat treated to produce 0.2% yield stresses of 180,000psi. The structure of Ti-6Al-2Sn-4Zr-6Mo was determined over a range of quenching and aging temperatures by x-ray and electron microscopy. Hardness was corrected with structure as a function of aging time. Methods of revealing grain size in a two-phase alpha-beta titanium alloy have been examined and observations on beta grain growth in the presence of alpha have been carried out. The hardness of grain boundary alpha was studied as a function of the thickness of alpha and the hardness of the beta matrix in a Ti-5.25Al-5.5V-0.9Fe-0.5Cu alloy. (Modified author abstract)