Staff View: Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route

Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route

Research related to the substitution of ubiquitous elements for high-cost rare elements during the fabrication of high-performance Ti alloys has attracted significant attention. The microstructure evolution is, however, challenging when several elements with different properties are used. This resea...

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Main Authors:	Bahadora, Abdollah, Umeda, Junko, Ghandvar, Hamidreza, Abu Bakar, Tuty Asma, Yamanoglu, Ridvan, Issariyapat, Ammarueda, Kondoh, Katsuyoshi
Format:	Article
Published:	Elsevier Inc. 2021
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/94002/ http://dx.doi.org/10.1016/j.matchar.2020.110855
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spelling	my.utm.940022022-02-28T13:31:03Z http://eprints.utm.my/id/eprint/94002/ Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route Bahadora, Abdollah Umeda, Junko Ghandvar, Hamidreza Abu Bakar, Tuty Asma Yamanoglu, Ridvan Issariyapat, Ammarueda Kondoh, Katsuyoshi TJ Mechanical engineering and machinery Research related to the substitution of ubiquitous elements for high-cost rare elements during the fabrication of high-performance Ti alloys has attracted significant attention. The microstructure evolution is, however, challenging when several elements with different properties are used. This research aims to study the effect of Si addition on the microstructure formation of the dual-phase Ti alloys in the presence of solid solution-forming elements such as Fe and Cu, and a high oxygen concentration. Ti–4Fe–0.5O–3Cu (TFOC) alloys with different Si contents (0.2, 0.4, and 0.6 wt%) were fabricated from the elemental powders using spark plasma sintering, followed by hot extrusion. The TFOC sintered alloys with 0.2 and 0.4% Si showed very similar microstructures in the lamellae α+β dual-phase. The coarsening of α colonies and primary β grains was remarkable when Si content increased to 0.6%. The obtained primary β grains were, however, significantly smaller than those in previous studies. In contrast, the refined globular α grains (respective grain sizes = 2.6 and 2.2 μm) embedded in the β matrix were observed in the hot extruded TFOC–0.2Si and TFOC–0.4Si alloys due to dynamic globularization. Additionally, EBSD analysis clarified that the hot extruded alloys had the strong fiber textures of (101¯0) and (101) for α and β phases respectively, which were consistent with the XRD results. High-resolution TEM examination demonstrated that Ti2Cu and Ti3Cu intermetallics of a length of 100–400 nm could form preferentially at α/β interfaces. The experimental results showed that 0.4 wt% Si added to TFOC alloys formed fine globular microstructures in the presence of hot plastic deformation. Elsevier Inc. 2021-02 Article PeerReviewed Bahadora, Abdollah and Umeda, Junko and Ghandvar, Hamidreza and Abu Bakar, Tuty Asma and Yamanoglu, Ridvan and Issariyapat, Ammarueda and Kondoh, Katsuyoshi (2021) Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route. Materials Characterization, 172 . ISSN 1044-5803 http://dx.doi.org/10.1016/j.matchar.2020.110855 DOI:10.1016/j.matchar.2020.110855
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Bahadora, Abdollah Umeda, Junko Ghandvar, Hamidreza Abu Bakar, Tuty Asma Yamanoglu, Ridvan Issariyapat, Ammarueda Kondoh, Katsuyoshi Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
description	Research related to the substitution of ubiquitous elements for high-cost rare elements during the fabrication of high-performance Ti alloys has attracted significant attention. The microstructure evolution is, however, challenging when several elements with different properties are used. This research aims to study the effect of Si addition on the microstructure formation of the dual-phase Ti alloys in the presence of solid solution-forming elements such as Fe and Cu, and a high oxygen concentration. Ti–4Fe–0.5O–3Cu (TFOC) alloys with different Si contents (0.2, 0.4, and 0.6 wt%) were fabricated from the elemental powders using spark plasma sintering, followed by hot extrusion. The TFOC sintered alloys with 0.2 and 0.4% Si showed very similar microstructures in the lamellae α+β dual-phase. The coarsening of α colonies and primary β grains was remarkable when Si content increased to 0.6%. The obtained primary β grains were, however, significantly smaller than those in previous studies. In contrast, the refined globular α grains (respective grain sizes = 2.6 and 2.2 μm) embedded in the β matrix were observed in the hot extruded TFOC–0.2Si and TFOC–0.4Si alloys due to dynamic globularization. Additionally, EBSD analysis clarified that the hot extruded alloys had the strong fiber textures of (101¯0) and (101) for α and β phases respectively, which were consistent with the XRD results. High-resolution TEM examination demonstrated that Ti2Cu and Ti3Cu intermetallics of a length of 100–400 nm could form preferentially at α/β interfaces. The experimental results showed that 0.4 wt% Si added to TFOC alloys formed fine globular microstructures in the presence of hot plastic deformation.
format	Article
author	Bahadora, Abdollah Umeda, Junko Ghandvar, Hamidreza Abu Bakar, Tuty Asma Yamanoglu, Ridvan Issariyapat, Ammarueda Kondoh, Katsuyoshi
author_facet	Bahadora, Abdollah Umeda, Junko Ghandvar, Hamidreza Abu Bakar, Tuty Asma Yamanoglu, Ridvan Issariyapat, Ammarueda Kondoh, Katsuyoshi
author_sort	Bahadora, Abdollah
title	Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
title_short	Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
title_full	Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
title_fullStr	Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
title_full_unstemmed	Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
title_sort	microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route
publisher	Elsevier Inc.
publishDate	2021
url	http://eprints.utm.my/id/eprint/94002/ http://dx.doi.org/10.1016/j.matchar.2020.110855
_version_	1726791466364174336
score	13.211869

Microstructure globularization of high oxygen concentration dual-phase extruded ti alloys via powder metallurgy route

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