Supplément au Journal de Physique Colloques

Sommaire

32 nd International Field Emission Symposium / 32ème Symposium International d'Emission de Champ

J. Phys. Colloques 47 (1986) C2-179-C2-183
DOI: 10.1051/jphyscol:1986226

MICROSCOPIC STRUCTURES OF METASTABLE PHASES IN Al-Ag BINARY ALLOYS

T. SAKURAI¹, A. JIMBO¹, T. HASHIZUME¹, A. SAKAI¹, K. OSAMURA² et T. NAKAMURA²

¹ The Institute for Solid State Physics, The University of Tokyo, Tokyo, Japan
² Department of Metallurgy, Kyoto University, Kyoto, Japan

Abstract
Morphology and chemical composition of metastable phases in an Al-5.72at% Ag alloy have been investigated by means of atom-probe field ion microscopy. The η-G. P. zone appears to have an ordered structure and its average solute concentration is 45.8at% Ag at 413 K. The ε-G. P. zone is spherical in shape and its composition is 35.7at% Ag. The γ metastable phase is plate-like precipitates lying on the lattice planes, whose composition has been determined for the first time to be 33.3at% Ag.