Accession Number : AD0759828

Title :   Fast Freezing as a Method for Aluminum Alloy Development.

Descriptive Note : Final rept. 10 Jul 70-31 Dec 72,

Corporate Author : ILLINOIS UNIV CHICAGO DEPT OF MATERIALS ENGINEERING

Personal Author(s) : Rostoker,W. ; Dudek,R. ; Freda,C. ; Russell,R.

Report Date : MAR 1973

Pagination or Media Count : 38

Abstract : 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)

Descriptors :   (*ALUMINUM ALLOYS, *POWDER METALLURGY), FREEZING, SOLID SOLUTIONS, ATOMIZATION, MECHANICAL PROPERTIES

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE