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Metals 2018, 8(10), 812; https://doi.org/10.3390/met8100812

Crystallization Kinetics and Consolidation of Al82La10Fe4Ni4 Glassy Alloy Powder by Spark Plasma Sintering

1
School of Materials Science and Engineering, Hanoi University of Science and Technology, Hanoi 100000, Vietnam
2
School of Materials Science and Engineering, University of Ulsan, 55-12, Technosanup-ro, Nam-Gu, Ulsan 44776, Korea
3
Department of Materials Science and Engineering, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP 13565-905, Brazil
4
University of Grenoble Alpes, Science et Ingénierie des Matériaux et Procédés (SIMAP), F-38000 Grenoble, France
5
Centre National de la Recherche Scientifique (CNRS), Science et Ingénierie des Matériaux et Procédés (SIMAP), F-38000 Grenoble, France
6
University of Grenoble Alpes, Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), F-38000 Grenoble, France
7
Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), F-38000 Grenoble, France
*
Author to whom correspondence should be addressed.
Received: 15 September 2018 / Revised: 6 October 2018 / Accepted: 8 October 2018 / Published: 11 October 2018
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Abstract

The mechanically alloyed Al82La10Ni4Fe4 glassy powder displays a two-step devitrification characterized by the precipitation of fcc-Al together with small amounts of the intermetallic Al11La3 phase in the first crystallization. The interface-controlled growth mechanism governed the first crystallization event. Calculations of the activation energy, using the methods of Kissinger, Ozawa, and Augis-Bennett gave values of 432.33, 443.2, and 437.76 kJ/mol, respectively. The calculated Avrami exponent (n) for the first crystallization peak was about 1.41, suggesting an almost zero nucleation rate. On the other hand, the value of n for the second peak related to the residual amorphous phase completely transformed into the intermetallic phase Al11La3 was about 3.61, characterizing diffusion controlled three-dimensional crystal growth with an increasing nucleation rate. Samples sintered at 573 K kept an amorphous structure and exhibited a high compressive strength of 650 MPa with a maximum elongation of 2.34% without any plastic deformation. The failure morphology of the sintered sample surface presented a transparticle fracture mechanism, indicating the efficiency of the sintering processing. View Full-Text
Keywords: bulk amorphous alloys; mechanical alloying; spark plasma sintering; crystallization kinetics; Avrami exponent bulk amorphous alloys; mechanical alloying; spark plasma sintering; crystallization kinetics; Avrami exponent
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Viet, N.H.; Oanh, N.T.H.; Kim, J.-S.; Jorge, A.M., Jr. Crystallization Kinetics and Consolidation of Al82La10Fe4Ni4 Glassy Alloy Powder by Spark Plasma Sintering. Metals 2018, 8, 812.

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