Metal treatment – Stock – Titanium – zirconium – or hafnium base
Patent
1997-08-27
1999-06-01
Sheehan, John
Metal treatment
Stock
Titanium, zirconium, or hafnium base
420418, 148669, C22C 1400
Patent
active
059085169
ABSTRACT:
This invention is a Titanium Aluminum alloy consisting essentially of the formula in atomic percent; Ti.sub.Bal. Al.sub.45-48 B.sub.0.01-0.75 Cr.sub.0-2 W .sub.0.25-2.25 Si.sub.0.1-0.7. The Boron is present in an atom. % of 0.01-0.75. The desired range is 0.1-0.5. The preferred range is 0.25+/-0.05. The optimum range is 0.25. The Chromium is present in an atom. % of 0-2. The desired range is 1.3-1.6. The preferred range is 1.5+/-0.1. The optimum range is 1.5. The Tungsten is present in an atom. % of 0.25-2.25. The desired range is 0.3-2.11. The preferred range is 0.75+/-0.05. The optimum range is 0.75. The Silicon is present in an atom. % of 0.1-0.7. The desired range is 0.4-0.6. The preferred range is 0.5+/-0.05. The optimum range is 0.5. The atom. % ratio of Cr/W is 0-5. The desired range is 1.33-2.69. The preferred range is 1.8-2.6. The optimum range is 1.85-2.5. The preferred alloy is a Titanium Aluminum alloy consisting essentially of the formula in atomic percent; Ti.sub.Bal. Al.sub.45.82 B.sub.0.25 Cr.sub.1.42 W.sub.0.70 Si.sub.0.45. The invention is also an article and method of forming said article of the above descibed alloy, for use as an engine component in high temperature and high stress situations. The process for forming the product includes investment casting and then thermomechanical treatment and/or homogenization.
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