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Cooling Rate Effects on Ti-6A1-4V and Beta III Titanium Alloys

Published online by Cambridge University Press:  21 February 2011

T. F. Broderick ,
F. H. Froes  and
A. G. Jackson
T. F. Broderick
Affiliation:
Air Force Wright Aeronautical Laboratories, Materials Laboratory, Structural Metals Branch, Wright-Patterson AFB, OH 45433;
F. H. Froes
Affiliation:
Air Force Wright Aeronautical Laboratories, Materials Laboratory, Structural Metals Branch, Wright-Patterson AFB, OH 45433;
A. G. Jackson
Affiliation:
systems Research Laboratories, 2800 Indian Ripple Road, Dayton, OH 45440
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Abstract

The titanium alloys Ti-6A1-4V and Ti-11.5Mo-6.0Zr-4.5Sn (Beta III) were produced at cooling rates of 103°C/sec and 105°C/sec using the Rotating Electrode Process (REP), and the Electron Beam Splat Quenching (EBSQ) process, respectively. Material from both alloys examined in the as-produced, heat treated, and vacuum hot pressed (VHP) conditions exhibited an order of magnitude decrease in beta grain size with increasing cooling rate (~135 μm and 7 μm in the Ti-6A1-4V alloy; ~40 μm and 2–4 μm in the Beta III alloy), and a difference in aging response between REP powder and EBSQ flakes. After heat treatment the Ti-6A1-4V developed an alpha morphology which was lenticular in REP powder and equiaxed in EBSQ flakes. Three possible mechanisms are proposed to explain this change involving an increased dislocation density and a tendency for grain boundary allotriomorphic alpha in the EBSQ case. Heat treatment of the Ti-11.5Mo-6.0Zr-4.5Sn materials showed a change in the location of alpha precipitation from interdendritic to grain boundary in going from REP to EBSQ. It is suggested that this change may relate to the decreased solute redistribution which occurs in the more rapidly cooled material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 28: Symposium F – Rapidly Solidified Metastable Materials , 1983 , 345
Copyright
Copyright © Materials Research Society 1984

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References

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