Nickel-base superalloy has a strength of 20,000 psi at 2,200 degrees F, approximately double the strength of the strongest available cast nickel-base alloys. It is not subject to the formation of embrittling phases upon long time exposure at intermediate temperatures

Freche, J. C.

Waters, W. J.

English

NASA Technical Reports Server

September 1969
	 Brief 69-10352 
NASA TECH BRIEF 
NASA Teèh Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Improved High-Temperature-Strength
Nickel-Base Superalloy 
.
A high strength nickel-base superalloy tailored for 
the 2,000-2,200°F temperature range has recently 
been developed. The alloy has high tensile strength 
over the entire temperature range and, its strength of 
20,000 psi at 2,200°F is approximately double the 
strength of the strongest available cast nickel-base 
alloys. The alloy possesses very high impact strength. 
The alloy is not subject to the formation of embrittling 
phases upon long-time exposure at intermediate tem-
peratures. Its room temperature, unnotched Charpy 
impact resistance is 135 ft.-lbs. after 1,000 hours 
exposure to a 1,600'F temperature. 
This alloy which is based on the nickel-aluminum-
tungsten system is designated WAZ-20. It has the 
following nominal composition in weight percent: 
17-20 tungsten, 6-7 aluminum, 1.4-1.6 zirconium, 
0.10-0.20 carbon, balance nickel. Its incipient 
melting point is 2,375°F which is approximately 
150°F higher than that of currently available cast 
nickel-base alloys. Also, the alloy is amenable to con-
trolled solidification techniques and in the direc-
tionally solidified form exhibits substantially improved 
tensile and stress rupture properties over the random 
polycrystalline form. 
Although a cast material, the alloy also has reason-
able workability potential.
Notes: 
I. Because of this combination of properties, the 
superalloy has application to such things as stator 
vanes for advanced gas turbine engines where 
temperature cycling and long time high tempera-
ture operation are required. 
2. Documentation is available from: 
Clearinghouse for Federal Scientific 
and Technical Information 
Springfield, Virginia 22151 
Price $3.00 
Reference: TSP69- 10352 
3. Technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B69-10352 
Patent Status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code GP, 
Washington, D.C. 20546. 
Source: William J. Waters and John C. Freche 
Lewis Research Center
(LEW- 10874) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Improved high-temperature-strength nickel-base superalloy

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