Abstracts Book - IMRC 2018

• SD7-P017
ANALYSIS OF THE STRUCTURE, MICROSTRUCTURE AND
MECHANICAL PROPERTIES OF A MULTICOMPONENT SYSTEM
ALCOCRFEMNNI SINTERED CONVENTIONALLY AND BY
ELECTROMAGNETIC INDUCTION.
Marco Antonio Ruiz Esparza Rodriguez 1 , Carlos Gamaliel Garay Reyes 1 , Jose Manuel Mendoza
Duarte 1 , Ivanovich Estrada 1 , Roberto Martinez Sanchez 1
1 Centro de Investigación en Materiales Avanzados, S.C., Metalurgia e Integridad Estructural,
Mexico.
The conventional process of powder metallurgy consists of the compaction of
the powders and a subsequent sintering. In this process, the time and the high
temperature that the material is exposed causes crystal growth, which modified
microstructure and the mechanical properties of the materials. Through the
sintering by electromagnetic induction the sintering variables (time and
temperature) are reduced avoiding the crystal growth. This work consists in the
evaluation of two different sintering process (conventional and by
electromagnetic induction) and their effect on structure, microstructure and
mechanical properties in the multicomponent system AlCoCrFeMnNi. The
equiatomic AlCoCrFeMnNi powders were obtained by mechanical alloying. Pure
elements (each of them at least 99.9% purity) were used as the raw material.
The millings were performed by using a high energy mill Spex 8000. 2 different
routes were used in consolidation process of the powders. The first one was
conventional consolidated with the following conditions: the compaction
pressure was 1.56 GPa for 10 min, followed by the sintered at 1200 ºC for 3 h.
The second one was the fast-low temperature consolidation with the following
conditions: compacted and pre-sinterized were performed simultaneously
under compaction pressure of 0.9 GPa at 600 ºC for 3 min using a high frequency
induction furnace, posteriorly a sintered was carried out at 1200 ºC for 1 h. The
microstructural and structural characterization was carried out by scanning
electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray
diffraction (XRD), while the mechanical properties were evaluated by Vickers
microhardness tests and the calculus of density were carried out by the method
of Archimedes. The results show that the samples sintered by electromagnetic
induction present higher density, smaller crystallite size and higher
microhardness values. The XRD patterns show a mixture of characteristic
reflections BCC and FCC structures, which was confirmed by selected area
electro diffraction patterns-TEM. In conclusion, the method of sintering by