Microstructure of borides in titanium and titanium aluminides

1990 ◽  
Vol 48 (4) ◽  
pp. 982-983
Author(s):  
Daniel S. Schwartz ◽  
S. M. L. Sastry
Keyword(s):  
Elevated Temperature ◽  
Titanium Alloys ◽  
Titanium Aluminides ◽  
High Strength ◽  
Rapid Solidification Processing ◽  
Solidification Processing ◽  
Elevated Temperature Strength ◽  
Hardening Mechanism ◽  
Aerospace Applications ◽  
Hard Particles

The high strength-to-weight ratios and high elevated-temperature strength of dispersion strengthened titanium and titanium aluminides make them attractive materials for aerospace applications. A fine dispersion of hard particles is introduced into these alloys to increase their strength through an Orowan hardening mechanism. In addition to strengthening the material, dispersoids with whisker morphologies can produce toughening. Titanium alloys containing boride dispersions are currently being investigated at McDonnell Douglas Research Laboratories, and the microstructure of the dispersoids will be reported in this paper. Fine boride dispersions were produced in alloys with the compositions Ti-6B, Ti-25A1-4B and Ti-48A1-5B (at.%) using rapid solidification processing. The alloys were then annealed at ∼800°C/1 h, TEM specimens produced by electropolishing, and the structure of the borides examined in detail with a JEOL 2000FX TEM.

Development of Elevated Temperature P/M Aluminum Alloy by Rapid Solidification Processing

1988 ◽  
pp. 200-205
Author(s):  
Shigenori Yamauchi ◽  
Kazuhisa Shibue ◽  
Hideo Sano ◽  
Kiyofumi Ito ◽  
Susumu Inumaru
Keyword(s):  
Aluminum Alloy ◽  
Elevated Temperature ◽  
Rapid Solidification ◽  
Rapid Solidification Processing ◽  
Solidification Processing

Rapid solidification processing of titanium alloys

1991 ◽  
Vol 36 (1) ◽  
pp. 85-123 ◽  
Author(s):  
C. Suryanarayana ◽  
F. H. Froes ◽  
R. G. Rowe
Keyword(s):  
Titanium Alloys ◽  
Rapid Solidification ◽  
Rapid Solidification Processing ◽  
Solidification Processing

scholarly journals Properties of Novel High Temperature Titanium Alloys for Aerospace Applications

2020 ◽  
Vol 321 ◽  
pp. 04006
Author(s):  
John Mantione ◽  
Matias Garcia-Avila ◽  
Matthew Arnold ◽  
David Bryan ◽  
John Foltz
Keyword(s):  
Elevated Temperature ◽  
Titanium Alloys ◽  
Creep Resistance ◽  
Engine Performance ◽  
Beta Titanium Alloy ◽  
Elevated Temperature Strength ◽  
Jet Engine ◽  
Beta Titanium ◽  
Alpha Beta ◽  
Beta Titanium Alloys

The attractive combination of strength and low density has resulted in titanium alloys covering 15 to 25% of the weight of a modern jet engine, with titanium currently being used in fan, compressor and nozzle components. Typically, titanium alloys used in jet engine applications are selected from the group of near alpha and alpha-beta titanium alloys, which exhibit superior elevated temperature strength, creep resistance and fatigue life compared to typical titanium alloys such as Ti-6Al-4V. Legacy titanium alloys for elevated temperature jet engine applications include Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-6Al-2Sn-4Zr-2Mo-0.1Si and Ti-4Al-4Mo-2Sn-0.5Si. Improving the mechanical behavior of these alloys enables improved component performance, which is crucial to advancing jet engine performance. As a world leader in supplying advanced alloys of titanium, nickel, cobalt, and specialty stainless steels, ATI is developing new titanium alloys with improved elevated temperature properties. These improved properties derive from precipitation of secondary intermetallics in alpha-beta titanium alloys. ATI has developed several new alpha-beta titanium alloy compositions which exhibit significantly improved elevated temperature strength and creep resistance. This paper will focus on the effects of chemistry and heat treat conditions on the microstructure and resulting elevated temperature properties of these new aerospace titanium alloys.

scholarly journals Effect of microstructure and cooling rate on the fatigue performance of TIMETAL® 575

2020 ◽  
Vol 321 ◽  
pp. 12019
Author(s):  
M. Bodie ◽  
M. Thomas ◽  
A. Ayub
Keyword(s):  
Titanium Alloys ◽  
Cooling Rate ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Electron Backscatter Diffraction ◽  
Material Selection ◽  
Weight Ratio ◽  
High Strength ◽  
Fatigue Performance ◽  
Aerospace Applications

A key design consideration for material selection in the aerospace industry is weight reduction; with excellent strength to weight ratio, high temperature resistance, and fatigue performance, titanium alloys are extensively used. New titanium alloys continue to enhance performance and broaden the range of applications. Titanium Metals Corporation (TIMET) recently developed TIMETAL® 575 (Ti575), a high strength titanium alloy with superior fatigue performance over Ti-6Al-4V, aimed at aerospace applications where these properties are imperative i.e. aerospace turbine discs and blades. [1] [2] This work intends to advance the understanding of the effect of thermal processing of Ti575, by investigating the effect of primary alpha (αp) volume fraction and cooling rate on tensile and fatigue performance in post forged heat-treated microstructures. Microstructural assessment and mechanical performance were completed and are discussed. Three cooling methods from three solution heat-treat temperatures were investigated in this work. The results from these experiments were compared using optical microscopy, electron backscatter diffraction (EBSD), room temperature tensile and high cycle fatigue (HCF) tests.

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