Fabrication of Ti Bulk amorphous alloys by mechanical alloying and plasma sintering methods and evaluation of structure and corrosion behavior

Document Type : Research Paper

Authors

• Hossein Naseri ¹
• Behnam Lotfi ²
• Zohreh Sadeghian ²

¹ PhD student of Materials Engineering, Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

² Associate Professor, Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

10.30495/jnm.2024.33830.2053

Abstract

Abstract
Introduction: Amorphous materials are of interest to academic and industry researchers due to their special properties. Optically and electronically they look like ordinary metals, but the absence of crystals and defects as vacancies, dislocations, or grain boundaries increase their chemical, physical and mechanical properties.
Methods: In this study, Ti47-Cu38-Zr7.5-Fe2.5-Sn2-Si1-Ag2 and Ti46-Cu27.5-Zr11.5-Co7-Sn3-Si1-Ag4 (%at) Amorphous alloys were produced by the mechanical alloying (MA) process and spark plasma sintering (SPS) technique, and their structure and corrosion behavior were evaluated. In order to study phase evolutions, evaluate the thermal stability and microstructure of the powder and compacted samples, XRD, DSC and FE-SEM were used, respectively. Furthermore, polarization method was used to evaluate corrosion.
Findings: The results showed that 45 hours of milling can tend to amorphization of powders. Ti47-Cu38-Zr7.5-Fe2.5-Sn2-Si1-Ag2 and Ti46-Cu27.5-Zr11.5-Co7-Sn3-Si1-Ag4 (%at) amorphous powders were compacted by plasma sintering process at 300 and 420 °C under 180 Mpa uniaxial pressure. The evaluation of the compacted samples showed that the samples sintered at 300°C temperature under 180 MPa retained their amorphous state. Additionally, investigation of corrosion behavior revealed that the amorphous TiCuZrSnSiAgFe alloy exhibited better corrosion resistance in the body simulation solution in comparison with TiCuZrSnSiAgCo and conventional Ti6Al4V alloys.

Keywords

• Amorphous alloys
• mechanical alloying
• SPS process

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