SOME OBSERVATIONS ON THE STRESS-CORROSION CRACKING OF THREE COMMERCIAL TITANIUM ALLOYS
BOEING COMMERCIAL AIRPLANE CO RENTON WA
Pagination or Media Count:
Stress-corrosion cracking was studied in commercial titanium alloys Ti-8Al-1Mo-1V, Ti-6Al-4V, and Ti-4Al-3Mo-1V. Electron fractography was used in conjunction with electron metallography to establish the fracture path. A sharp transition from ductile to cleavage failure occurs in the alpha phase between 4 and 6 weight percent aluminum, while the beta phase fails by ductile rupture in all cases. Thin-foil electron microscopy was used to show that the dislocation arrangements produced in the alpha phase range from tangles in the 4 weight percent aluminum alloy to coplanar arrays in the 6 and 8 weight percent alloys. The relation between dislocation arrangements and fracture mode offers a qualitative explanation of the variations in environmental susceptibility of various titanium alloys.
- Properties of Metals and Alloys