Stability of an amorphous alloy of the Mm-Al-Ni-Cu system
AUTOR(ES)
Triveño Rios, Carlos, Aliaga, Luis César Rodrígues, Kiminami, Claudio Shyinti, Bolfarini, Claudemiro, Botta Filho, Walter José
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
30/08/2012
RESUMO
An investigation was made of the stability of melt-spun ribbons of Mm55Al25Ni10Cu10 (Mm = Mischmetal) amorphous alloy. The structural transformations that occurred during heating were studied using a combination of X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Crystallization took place through a multi-stage process. The first stage of transformation corresponded to the formation of a metastable phase followed by cfc-Al precipitation, while in the second stage, exothermic transformations led to the formation of complex and unidentified Mm(Cu, Ni) and MmAl(Cu, Ni) phases. The transformation curves recorded from isothermal treatments at 226 °C and 232 °C indicated that crystallization occurred through nucleation and growth, with diffusion-controlled growth occurring in the first crystallization stage. The supercooled liquid region, ∆Tx, at 40 K/min was ~80 K. This value was obtained by the substitution of Mm (=Ce + La + Nd + Pr) for La or Ce, saving chemical element-related costs.
Documentos Relacionados
- Crystallization Behavior of Amorphous Ti51.1Cu38.9Ni10.0 Alloy
- Influence of Directional Solidification on the Mechanical Properties of Cu-Al-Be-Nb-Ni Alloy
- Phase Formation, Thermal Stability and Mechanical Properties of a Cu-Al-Ni-Mn Shape Memory Alloy Prepared by Selective Laser Melting
- Electrochemical behavior of Cu-9%Al-5%Ni-2%Mn alloy in chloride media
- Consolidation of the Cu46Zr42Al7Y5 amorphous ribbons and powder alloy by hot extrusion