Accession Number : AD0864122

Title :   Research on Deformation and Possible Strengthening Mechanisms for Solid Solution Phases of Titanium.

Descriptive Note : Final rept. 1 Jun 66-31 Jul 69,

Corporate Author : MARTIN MARIETTA AEROSPACE ORLANDO FL

Personal Author(s) : Cass, Thomas R. ; Spencer, William R.

Report Date : DEC 1969

Pagination or Media Count : 76

Abstract : The report is a summary of research on the growth, perfection and slip processes in pure titanium and titanium-aluminum single phase alloys. A technique was developed for the growth of titanium and dilute titanium alloy single crystals using an electron-beam zone refiner. A dislocation etchant was discovered, allowing the perfection of these crystals of 10 to the minus 9th power/sq cm. However, annealing the crystals just below the transformation temperature for long times lowers the dislocation density by two to three orders of magnitude. Compression specimens were spark-erosion machined from single crystals, annealed and mecahnically tested. A c-axis compression specimen of high purity titanium deformed by twinning. However, high interstitial content and dilute aluminum alloys both deformed by c+a glide when the load axis was near (0001). This additional deformed system accounts for the polycrystalline ductility of alpha-titanium alloys. An analysis of plastic deformation modes in TiAl was also made. Results on polycrystalline TiAl were in agreement with these predictions. However, single crystals could not be grown for definitive verification of the hypothesized modes. (Author)

Descriptors :   *GRAIN STRUCTURES(METALLURGY)), (*TITANIUM ALLOYS, TITANIUM, ALUMINUM ALLOYS, SINGLE CRYSTALS, SOLID SOLUTIONS, CRYSTAL GROWTH, DISLOCATIONS, CRYSTAL SUBSTRUCTURE, DEFORMATION, TWINNING(CRYSTALLOGRAPHY).

Subject Categories : Metallurgy and Metallography
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE