Accession Number:

AD0661812

Title:

SOME OBSERVATIONS ON THE STRESS-CORROSION CRACKING OF THREE COMMERCIAL TITANIUM ALLOYS

Descriptive Note:

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO RENTON WA

Personal Author(s):

Report Date:

1967-09-01

Pagination or Media Count:

11.0

Abstract:

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.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE