VOLUME 4: New, Improved and Existing Technologies: Non-Ferrous Materials Extraction and Processing

M.R. ESQUIVEL; J.J.ANDRADE GAMBOA; F.GENNARI; G.O. MEYER

SOHN INTERNATIONAL SYMPOSIUM -ADVANCED PROCESSING OF METALS AND MATERIALS

The Minerals, Metals and Materials Society

Lugar: Warrendale, Pennsylvania; Año: 2006; p. 517 - 526

A MmNi5 alloy is synthesized by a combination of mechanical milling and low temperature heating processes. Synthesis time is 40 h for powders milled in a low energy ball mill at room temperature. A reduction in milling time is obtained if massive sample is mechanically milled at shorter times (2 to 10 h) and heated at temperatures lower (600 ºC) than the usual temperatures used in equilibrium methods (T>800ºC). The alloy formation is detected even at a combination of temperatures as low as 200 ºC and milling times as short as 5 h. The temporal evolution of mechanical milling process was followed by both X-ray diffraction (XRD) and scanning electron microscopy (SEM) to detect the main stages of milling. Four stages were detected: Initial, Intermediate, Final and Completion. These stages were correlated to the enhancement of the synthesis method by combination of milling times shorter than 10 h and temperatures of heating lower than 600 ºC.