KINETICS OF FORMATION AND REVERSION OF GUINIER-PRESTON ZONES IN ALUMINUM-BASE ALLOYS

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Abstract:

This report includes REVERSION AND REFORMATION GP I IN Al-1.7 AT .PERCENT Cu, by H. Herman and M. E. Fine. Apr 62. FORMATION AND REVERSION OF GUINIER-PRESTON ZONES IN Al-5.3 AT .PERCENT Zn, by H. Herman, J. B. Cohen, and M. E. Fine. Apr 62. Revision and reformation of GP I in Al-1.7 at. Cu K INETICS OF REVERSION AND REFORMATION OF GP I were studied resistometrically in this alloy. The revision is over in about 12 min at 205 C, irrespective of the amount of primary aging. After revision the occurrence of incubation time before reaging was substantiated. Plastic deformation drastically accelerates the reaging kin ics. An incubation time is observed only if the specimen is aged before reversion. Incubation time and the effect of plastic deformation indicated that ucleation of GP I is heterogeneous. Formation and reversion of GP zo es in Al-5.3 at. Zn Studies were made by measurement of electrical resistance, Youngs modulus, critical resolved shear stress and x-ray scattering. After a long aging treatment, about 12 of the Zn atoms are associated with zones after a long reaging treatment, about 14 are associated with zones.

Author(s):
Herman, H. ; Fine, M. E.
Author Organization(s):
AIR FORCE OFFICE OF SCIENTIFIC RESEARCH ARLINGTON VA
Annotation:
ALUMINUM BASE ALLOYS: AL 1.7 AT .% CU AND AL-5.3 AT .% ZN; GUNIER-PRESTON ZONE FORMATION AND REVERSION.
Pagination:
0001

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
1710, AFOSR-1710
Contract/Grant Number(s):
AF49 638 524
Monitor Series:
1710
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*AGING (PHYSIOLOGY), *ALUMINUM ALLOYS, *COPPER ALLOYS, *CREEP, *CRYSTAL LATTICES, *CRYSTAL STRUCTURE, *DEFORMATION, *KINETIC THEORY, *PHASE STUDIES, *SOLID STATE PHYSICS, *SOLIDS, *SOLUTIONS(MIXTURES), *ZINC ALLOYS
Report Date:
1962 Apr 01