TY - JOUR
T1 - Extended solid solubility of a Co-Cr system by mechanical alloying
AU - Betancourt-Cantera, J. A.
AU - Sánchez-De Jesús, F.
AU - Torres-Villaseñor, G.
AU - Bolarín-Miró, A. M.
AU - Cortés-Escobedo, C. A.
N1 - Funding Information:
This project was financially assisted by the National Science and Technology Council of Mexico, CONACyT from México under grant no. 129910 , 157925 and 130413 . Additionally, the authors are grateful to Maria Magdalena Marines Cruz from DiSA, UAEH, for her many useful suggestions.
PY - 2012/7/15
Y1 - 2012/7/15
N2 - Mechanical alloying, MA, has been successfully used to extend the limits of solid solubility in many commercially important metallic systems. The aim of this work is to demonstrate that MA modifies the solid solubility of the Co-Cr system. Co and Cr elemental powders were used as precursors and mixed in an adequate weight ratio to obtain Co100-xCrx (0 ≤ x ≤ 100, Δx = 10) to study the effect of mechanical processing in the solubility of the Co-Cr system. Processing was carried out at room temperature in a shaker mixer mill using vials and balls of hardened steel as milling media with a ball:powder weight ratio of 10:1. Crystalline structure characterization of the milled powders was conducted using X-ray diffraction, and phase transformations as a function of composition were analyzed. Thermal analysis confirmed structural changes occurred in the mechanically alloyed powders. The evolution of the phase transformations with composition is reported for each composition. The results showed that after high energy ball milling for 7 h, the solid solubility between Co and Cr could be evidently extended, despite the low solid solubility at the equilibrium conditions of this system. Additionally, the micrographs of the milled powders showed that increasing composition of chromium changes the shape and size of the particles while simultaneously reducing their agglomeration; this effect is possibly attributed to the brittleness of elemental chrome.
AB - Mechanical alloying, MA, has been successfully used to extend the limits of solid solubility in many commercially important metallic systems. The aim of this work is to demonstrate that MA modifies the solid solubility of the Co-Cr system. Co and Cr elemental powders were used as precursors and mixed in an adequate weight ratio to obtain Co100-xCrx (0 ≤ x ≤ 100, Δx = 10) to study the effect of mechanical processing in the solubility of the Co-Cr system. Processing was carried out at room temperature in a shaker mixer mill using vials and balls of hardened steel as milling media with a ball:powder weight ratio of 10:1. Crystalline structure characterization of the milled powders was conducted using X-ray diffraction, and phase transformations as a function of composition were analyzed. Thermal analysis confirmed structural changes occurred in the mechanically alloyed powders. The evolution of the phase transformations with composition is reported for each composition. The results showed that after high energy ball milling for 7 h, the solid solubility between Co and Cr could be evidently extended, despite the low solid solubility at the equilibrium conditions of this system. Additionally, the micrographs of the milled powders showed that increasing composition of chromium changes the shape and size of the particles while simultaneously reducing their agglomeration; this effect is possibly attributed to the brittleness of elemental chrome.
KW - Co alloys
KW - Co-Cr system
KW - Mechanical alloying
KW - Phase diagram
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=84859485882&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2012.03.082
DO - 10.1016/j.jallcom.2012.03.082
M3 - Artículo
SN - 0925-8388
VL - 529
SP - 58
EP - 62
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -