Synthesis and electrochemical properties of Ti-Si alloys prepared by mechanical alloying and heat treatment
Keywords: 
Mechanical alloying
Ti-Si alloys
X-ray diffraction
Electrochemical behavior
Issue Date: 
2018
Publisher: 
MDPI AG
ISSN: 
2075-4701
Note: 
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Citation: 
Guzmán, D. (Danny); García, C. (Carolina); Soliz, Á. (Álvaro); et al. "Synthesis and electrochemical properties of Ti-Si alloys prepared by mechanical alloying and heat treatment". Metals. 8 (6), 2018, 417
Abstract
The aim of this work was to study the synthesis and electrochemical properties of Ti 2 wt %-Si alloys prepared by mechanical alloying (MA) and heat treatment. The MA process was performed under Ar atmosphere. The structural, morphological, and compositional evolutions during the milling and subsequent heat treatment were investigated by X-ray diffraction, energy-dispersive spectroscopy, and scanning electron microscopy. The electrochemical behavior was evaluated by open circuit potential and linear sweep voltammetry measurements. The results showed that the MA process promotes the formation of a supersaturated α-Ti-Si solid solution. During heat treatment, the Si remaining in the mechanically alloyed powders and the Si from the α-Ti-Si supersaturated solid solution reacted with Ti to form Ti-Si intermetallic compounds. These compounds have a fine and homogeneous distribution in the α-Ti matrix, which cannot be achieved by conventional casting methods. Additionally, the electrochemical evaluations revealed that the mechanically alloyed and heat-treated Ti 2 wt %-Si powders have better corrosion resistance in 1.63 M H2SO4 than the pure Ti and MA Ti-Si samples. This is likely due to the particular microstructure produced during the milling and subsequent heat treatment.

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