Evaluation of the stress-corrosion characteristics of aluminum alloy M-45 shows that the most favorable artificial aging cycle for this alloy, with regard to optimum strength and stress-corrosion resistance, appears to be 400 degrees F for 12 hours

Lovoy, C. V.

English

NASA Technical Reports Server

June 1968	 Brief 68-10184 
NASA TECH BRIEF 
NASA Tech 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. 
Stress-Corrosion Characteristics of Aluminum Casting Alloy M-45 
Aluminum alloy M-45 was developed primarily as a 
lightweight structural casting metal with high tensile, 
yield, and impact strengths at cryogenic tempera-
tures. The composition and mechanical properties of 
this alloy are given in Tech Brief 65-10092. Tentative 
results of an experimental study undertaken to arrive 
at a heat-treatment cycle which would optimize both 
the strength and stress-corrosion resistance of M-45 
are discussed in Tech Brief 67-10159. 
In a recent investigation, the stress-corrosion 
characteristics of the M-45 aluminum alloy were 
evaluated for the nine aged conditions considered, 
from the earlier study, as most promising with regard 
to a combination of optimum strength and stress-
corrosion resistance. The only specimens stressed to 
75 percent of the yield strength which did not display 
stress corrosion cracking were those artificially aged 
at 400° F for 12 hours. Stress-corrosion cracking was 
evident in 4 of 6 specimens artificially aged at 375° F
for 26 hours. It is concluded from this investigation 
that the most favorable artificial aging cycle for this 
alloy, with regard to optimum strength and stress-
corrosion resistance, appears to be 400°F for 12 hours. 
The practice of aging at 375 0 F for 26 hours does not 
result in an optimum combination of strength and 
stress-corrosion resistance. 
Note: 
Complete details of this investigation may be 
obtained from: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B68-10184 
Patent status: 
No patent action is contemplated by NASA. 
Source: C. V. Lovoy 
(M FS- 14817) 
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.
https://ntrs.nasa.gov/search.jsp?R=19680000184 2020-03-12T05:31:16+00:00Z


Stress-corrosion characteristics of aluminum casting alloy M-45

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server