INVESTIGADORES
TOLLEY Alfredo Juan
artículos
Título:
Hardness Of Cu-Mn-Al Alloys As A Function Of The Annealing Temperature In Phase.
Autor/es:
M. PRADO; A. TOLLEY
Revista:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Año: 1999 vol. 273 p. 590 - 594
ISSN:
0921-5093
Resumen:
Samples of Cu10.0at.%Mn18.8at.%Al and Cu11.0at.%Mn18.1at.%Al alloys
were prepared in the metastable austenitic β phase, by quenching from
1123 K into water at room temperature. The as quenched samples were
found to be L21 ordered. Aging of these alloys at different
temperatures induced an evolution of the microhardness. These
microhardness changes are interpreted using the information from X-ray
diffraction (XRD), martensitic transformation temperature measurements,
transmission electron microscopy (TEM) and microanalysis using scanning
electron microscopy (SEM). Changes in microhardness at low temperatures
are correlated with the martensitic transformation temperature Msprovided that Ms
is close to room temperature. Microhardness changes at higher
temperatures are caused by the decomposition of the β phase. The
kinetics of β phase decomposition was followed measuring its 200 XRD
peak intensity. The experiments suggest that the last vestiges of β
phase are L21 long range ordered and that an α fcc phase is formed during the first stages of decomposition.