DEFORMATION PROCESSING OF ANISOTROPIC METALS.
Abstract
This report presents experimental yield loci and pole figures for four alpha titanium alloy sheets. The pole figures for these materials exhibited a wide range of crystallographic textures ranging from a tight texture about the sheet normal in 1/16-in thick 4 Al-1/4 O2 through a split texture along the transverse direction in 5 Al-2.5 Sn, to a texture with the basal-plane normals concentrated about the transverse direction in RC-70. R values in the rolling and transverse directions are shown as a function of strain. There is a clear relationship to texture. Presented are experimental yield loci, loci calculated from uniaxial R values and yield strengths by the Hill theory and calculated loci for isotorpic material. Agreement with the Hill theory appears to be good except for the 1/16-in thick 4 Al-1/4 O material in which texture hardening is considerably less than predicted; this may result from much more extensive twinning under the higher stresses in combined stress (plane-strain compression) loading. Implicit in calculations based on the Hill theory is an assumption of a fixed deformation mode; if the mode were to change under the high stresses for yield in texture hardened sheet, applicability of the theory would be restricted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0611832
Entities
People
- D. H. Avery
- W. A. Backofen
Organizations
- Massachusetts Institute of Technology