The Effect of Addition Elements on the Rate of Beta Grain Growth in Alph-Beta and Beta Titanium Alloys

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Report Number: ASD TDR 62-520
Author(s): Crossley, F. A.
Corporate Author(s): Armour Research Foundation
Laboratory: Directorate of Materials and Processes
Corporate Report Number: ARF 2213-14
Date of Publication: 1962-11
Pages: 60
Contract: AF 33(616)-7687
DoD Project: 7351 - Metallic Materials
DoD Task: 735105
Identifier: AD0292703
AD Number: AD-292 703

The inhibition of beta grain growth in titanium alloys was investigated. The principal means investigated was the addition of minor amounts of solutes. Grain growth inhibition was expected to result from the preferential adsorption of additions on the gain boundary and the consequent lowering of the grain boundary energy. Solutes were selected on two bases: (1) experimental indication of the effectiveness as reported in the literature, and (2) anticipated high degree of polarizability. Solutes of high polarizability were expected to be relatively more effective in lowering the grain boundary energy because of the ease by which their outer electronic field can be distorted. The study involved three base compositions: unalloyed titanium, B-120VCA (Ti-13V-11Cr-3Al), and Ti-8Al-1Mo-1V alloy. Additions were selected for high polarizability were barium and strontium. Other additions evaluated were boron, sulfur, and silver plus hafnium. The sulfur and boron additions produced particulate phases in the alloys. Only additions of sulfur or boron inhibited beta grain growth in titanium and Ti-8Al-1Mo-1V alloy. However, in B-120VCA barium was only slightly less effective in inhibiting grain growth than sulfur or boron. Room temperature tensile properties gave no indications of detriment to mechanical properties due to any of the additions. Strontium appeared to be beneficial to ductility through a scavenging action.

Provenance: Lockheed Martin Missiles & Fire Control

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