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Fast Freezing as a Method for Aluminum Alloy Development.
Final rept. 10 Jul 70-31 Dec 72,
ILLINOIS UNIV CHICAGO DEPT OF MATERIALS ENGINEERING
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It is shown that the atomization process generates sufficiently high freezing rates to suppresswithin limits the primary crystallization of intermetallic compounds and the secondary crystallization of eutectic. The resultant structures are probably supersaturated solid solutions. Thus for example alloying aluminum with as much as 5 Mn and 3 Cr, respectively, is practical. It is shown that Al-Mn-Cu and Al-Mn-Cr-Mg-Zn alloys produced from consolidated powder can generate high tensile yield strengths and hardnesses which resist softening at temperatures as high as 350C. Some alloys show good hot yield strengths. Preliminary tests indicate that these alloys are not susceptible to stress-corrosion cracking at stresses of yield strength magnitude. Author Modified Abstract
APPROVED FOR PUBLIC RELEASE