Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies

Sun, Shi Hai; Hagihara, Koji; Ishimoto, Takuya; Suganuma, Ryoya; Xue, Yun Fei; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.addma.2021.102329

Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies

Sun, Shi Hai; Hagihara, Koji; Ishimoto, Takuya et al.

Additive Manufacturing, 2021, 47, 102329

Number of Access:652（2025-07-18 10:09 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89765

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Title	Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies
Creator	CreatorName Sun, Shi Hai
	NRID 1000010346182 1000010346182 researchmap permalink read0191194 read0191194 Scopus Author ID 7007016278 7007016278 CreatorName Hagihara, Koji
	NRID 1000050508835 1000050508835 ORCID 0000-0003-0081-0591 0000-0003-0081-0591 researchmap permalink i_taku i_taku Scopus Author ID 35310484700 35310484700 CreatorName Ishimoto, Takuya
	CreatorName Suganuma, Ryoya
	CreatorName Xue, Yun Fei
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 CreatorName Nakano, Takayoshi
Subject	Beta-Ti alloy
	Crystallographic texture
	Electron beam powder bed fusion
	Laser powder bed fusion
	Process map
Description	Sun S.H., Hagihara K., Ishimoto T., et al. Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies. Additive Manufacturing, 47, 102329. https://doi.org/10.1016/j.addma.2021.102329.
Abstract	Depending on the application, establishing a strategy for selecting the type of powder bed fusion technology—from electron beam (EB-PBF) or laser powder bed fusion (L-PBF)—is important. In this study, we focused on the β-type Ti–15Mo–5Zr–3Al alloy (expected for hard-tissue implant applications) as a model material, and we examined the variations in the microstructure, crystallographic texture, and resultant mechanical properties of specimens fabricated by L-PBF and EB-PBF. Because the melting mode transforms from the conduction mode to the keyhole mode with an increase in the energy density in L-PBF, the relative density of the L-PBF-built specimen decreases at higher energy densities, unlike that of the EB-PBF-built specimen. Although both EB-PBF and L-PBF can obtain cubic crystallographic textures via bidirectional scanning with a 90° rotation in each layer, the formation mechanisms of the textures were found to be different. The <100> texture in the build direction is mainly derived from the vertically grown columnar cells in EB-PBF, whereas it is derived from the vertically and horizontally grown columnar cells in L-PBF. Consequently, different textures were developed via bidirectional scanning without rotation in each layer: the <110> and <100> aligned textures along the build direction in L-PBF and EB-PBF, respectively. The L-PBF-built specimen exhibited considerably better ductility, but slightly lower strength than the EB-PBF-built specimen, under the conditions of the same crystallographic texture and relative density. We attributed this to the variation in the microstructures of the specimens; the formation of the α-phase was completely absent in the L-PBF-built specimen. The results demonstrate the importance of properly selecting the two technologies according to the material and its application.
Publisher	Elsevier
Source Title	Additive Manufacturing
Volume (Issue)	47
Page	102329
Date of Issued	2021-11-01
Language	English
Handle URL	https://hdl.handle.net/11094/89765
eISSN	22148604
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.addma.2021.102329
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Additive Manufacturing. 2021, 47, p. 102329
DC.title	Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies
DC.creator	Sun, Shi Hai
	Hagihara, Koji
	Ishimoto, Takuya
	Suganuma, Ryoya
	Xue, Yun Fei
	Nakano, Takayoshi
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-11-01
DC.identifier	https://doi.org/10.1016/j.addma.2021.102329
DC.subject	Beta-Ti alloy
	Crystallographic texture
	Electron beam powder bed fusion
	Laser powder bed fusion
	Process map
DC.description	Sun S.H., Hagihara K., Ishimoto T., et al. Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies. Additive Manufacturing, 47, 102329. https://doi.org/10.1016/j.addma.2021.102329.
DCTERMS.abstract	Depending on the application, establishing a strategy for selecting the type of powder bed fusion technology—from electron beam (EB-PBF) or laser powder bed fusion (L-PBF)—is important. In this study, we focused on the β-type Ti–15Mo–5Zr–3Al alloy (expected for hard-tissue implant applications) as a model material, and we examined the variations in the microstructure, crystallographic texture, and resultant mechanical properties of specimens fabricated by L-PBF and EB-PBF. Because the melting mode transforms from the conduction mode to the keyhole mode with an increase in the energy density in L-PBF, the relative density of the L-PBF-built specimen decreases at higher energy densities, unlike that of the EB-PBF-built specimen. Although both EB-PBF and L-PBF can obtain cubic crystallographic textures via bidirectional scanning with a 90° rotation in each layer, the formation mechanisms of the textures were found to be different. The <100> texture in the build direction is mainly derived from the vertically grown columnar cells in EB-PBF, whereas it is derived from the vertically and horizontally grown columnar cells in L-PBF. Consequently, different textures were developed via bidirectional scanning without rotation in each layer: the <110> and <100> aligned textures along the build direction in L-PBF and EB-PBF, respectively. The L-PBF-built specimen exhibited considerably better ductility, but slightly lower strength than the EB-PBF-built specimen, under the conditions of the same crystallographic texture and relative density. We attributed this to the variation in the microstructures of the specimens; the formation of the α-phase was completely absent in the L-PBF-built specimen. The results demonstrate the importance of properly selecting the two technologies according to the material and its application.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89765
citation_title	Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies
citation_author	Sun, Shi Hai
	Hagihara, Koji
	Ishimoto, Takuya
	Suganuma, Ryoya
	Xue, Yun Fei
	Nakano, Takayoshi
citation_publisher	Elsevier
citation_language	English
citation_date	2021-11-01
citation_journal_title	Additive Manufacturing
citation_volume	47
citation_firstpage	102329
citation_doi	https://doi.org/10.1016/j.addma.2021.102329
citation_public_url	https://hdl.handle.net/11094/89765

Comparison of microstructure, crystallographic texture, and mechanical properties in Ti–15Mo–5Zr–3Al alloys fabricated via electron and laser beam powder bed fusion technologies

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