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Mechanical Amorphization and Recrystallization of Mn-Co(Fe)-Ge(Si) Compositions

Departamento Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, 41080 Sevilla, Spain
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Metals 2019, 9(5), 534; https://doi.org/10.3390/met9050534
Received: 18 April 2019 / Revised: 3 May 2019 / Accepted: 6 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Mechanical Alloying: Processing and Materials)
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Abstract

Mechanical alloying using a planetary ball mill allowed us to obtain two homogeneous systems formed by units with nanometer size and MnCo0.8Fe0.2Ge1−xSix stoichiometry (x = 0 and 0.5). The phase evolution of the systems with the milling time was analyzed using X-ray diffraction. Thermal stability of the final products was studied using differential scanning calorimetry. Room temperature 57Fe Mössbauer spectroscopy was used to follow the changes in the Fe environments. A paramagnetic Co-based amorphous phase developed in both alloys as milling progressed. However, while the presence of Si stabilized the Mn-type phase, mechanical recrystallization was observed in a Si-free composition leading to the formation of a MnCo(Fe)Ge intermetallic (Pnma space group) with a crystal size of 7 ± 1 nm. Mössbauer results indicate that Fe atoms migrate from the initial bcc phase to the amorphous and intermetallic phases. View Full-Text
Keywords: half-Heusler alloys; mechanical alloying; Mössbauer spectroscopy half-Heusler alloys; mechanical alloying; Mössbauer spectroscopy
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Vidal-Crespo, A.; Ipus, J.J.; Blázquez, J.S.; Conde, A. Mechanical Amorphization and Recrystallization of Mn-Co(Fe)-Ge(Si) Compositions. Metals 2019, 9, 534.

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