Stability of an amorphous alloy of the Mm-Al-Ni-Cu system
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.
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ABM, ABC, ABPol
2012
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oai:scielo:S1516-143920120005000112012-09-18Stability of an amorphous alloy of the Mm-Al-Ni-Cu systemTriveño Rios,CarlosAliaga,Luis César RodríguesKiminami,Claudio ShyintiBolfarini,ClaudemiroBotta Filho,Walter José mischmetal based glass alloys crystallization thermal stability 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.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.15 n.5 20122012-10-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000500011en10.1590/S1516-14392012005000106 |
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Triveño Rios,Carlos Aliaga,Luis César Rodrígues Kiminami,Claudio Shyinti Bolfarini,Claudemiro Botta Filho,Walter José |
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Triveño Rios,Carlos Aliaga,Luis César Rodrígues Kiminami,Claudio Shyinti Bolfarini,Claudemiro Botta Filho,Walter José Stability of an amorphous alloy of the Mm-Al-Ni-Cu system |
| author_facet |
Triveño Rios,Carlos Aliaga,Luis César Rodrígues Kiminami,Claudio Shyinti Bolfarini,Claudemiro Botta Filho,Walter José |
| author_sort |
Triveño Rios,Carlos |
| title |
Stability of an amorphous alloy of the Mm-Al-Ni-Cu system |
| title_short |
Stability of an amorphous alloy of the Mm-Al-Ni-Cu system |
| title_full |
Stability of an amorphous alloy of the Mm-Al-Ni-Cu system |
| title_fullStr |
Stability of an amorphous alloy of the Mm-Al-Ni-Cu system |
| title_full_unstemmed |
Stability of an amorphous alloy of the Mm-Al-Ni-Cu system |
| title_sort |
stability of an amorphous alloy of the mm-al-ni-cu system |
| description |
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. |
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ABM, ABC, ABPol |
| publishDate |
2012 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000500011 |
| work_keys_str_mv |
AT trivenorioscarlos stabilityofanamorphousalloyofthemmalnicusystem AT aliagaluiscesarrodrigues stabilityofanamorphousalloyofthemmalnicusystem AT kiminamiclaudioshyinti stabilityofanamorphousalloyofthemmalnicusystem AT bolfariniclaudemiro stabilityofanamorphousalloyofthemmalnicusystem AT bottafilhowalterjose stabilityofanamorphousalloyofthemmalnicusystem |
| _version_ |
1756420434369183744 |