Improving the tensile properties of additively manufactured β-containing tial alloys via microstructure control focusing on cellular precipitation reaction

Cho, Ken; Odo, Hirotaka; Okamoto, Keisuke; Yasuda, Hiroyuki Y.; Nakashima, Hirotoyo; Takeyama, Masao; Nakano, Takayoshi

doi:https://doi.org/10.3390/cryst11070809

アクセス数:218件（2025-01-24 11:24 集計）

固定URL: https://hdl.handle.net/11094/89778

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タイトル	Improving the tensile properties of additively manufactured β-containing tial alloys via microstructure control focusing on cellular precipitation reaction
著者	NRID 1000000633661 1000000633661 researchmap permalink choken choken Scopus Author ID 55535308400 55535308400 著者名 Cho, Ken
	著者名 Odo, Hirotaka
	著者名 Okamoto, Keisuke
	NRID 1000060294021 1000060294021 ORCID 0000-0002-7077-0655 0000-0002-7077-0655 researchmap permalink read0051691 read0051691 Scopus Author ID 47861549600 47861549600 著者名 Yasuda, Hiroyuki Y.
	著者名 Nakashima, Hirotoyo
	著者名 Takeyama, Masao
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 著者名 Nakano, Takayoshi
キーワード等	Additive manufacturing
	Cellular precipitation reaction
	Electron beam powder bed fusion
	Microstructure
	Tensile properties
	Titanium aluminide
内容	Cho K., Odo H., Okamoto K., et al. Improving the tensile properties of additively manufactured β-containing tial alloys via microstructure control focusing on cellular precipitation reaction. Crystals, 11, 7, 809. https://doi.org/10.3390/cryst11070809.
抄録	The effect of a two-step heat treatment on the microstructure and high-temperature tensile properties of β-containing Ti-44Al-4Cr (at%) alloys fabricated by electron beam powder bed fusion were examined by focusing on the morphology of α2/γ lamellar grains and β/γ cells precipitated at the lamellar grain boundaries by a cellular precipitation reaction. The alloys subjected to the first heat treatment step at 1573 K in the α + β two-phase region exhibit a non-equilibrium microstructure consisting of the α2/γ lamellar grains with a fine lamellar spacing and a β/γ duplex structure located at the grain boundaries. In the second step of heat treatment, i.e., aging at 1273 K in the β + γ two-phase region, the β/γ cells are discontinuously precipitated from the lamellar grain boundaries due to excess Cr supersaturation in the lamellae. The volume fraction of the cells and lamellar spacing increase with increasing aging time and affect the tensile properties of the alloys. The aged alloys exhibit higher strength and comparable elongation at 1023 K when compared to the as-built alloys. The strength of these alloys is strongly dependent on the volume fraction and lamellar spacing of the α2/γ lamellae. In addition, the morphology of the β/γ cells is also an important factor controlling the fracture mode and ductility of these alloys.
出版者	MDPI
収録物名	Crystals
巻(号)	11(7)
ページ	809
刊行年月	2021-07-12
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89778
eISSN	20734352
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.3390/cryst11070809
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Crystals. 2021, 11(7), p. 809
DC.title	Improving the tensile properties of additively manufactured β-containing tial alloys via microstructure control focusing on cellular precipitation reaction
DC.creator	Cho, Ken
	Odo, Hirotaka
	Okamoto, Keisuke
	Yasuda, Hiroyuki Y.
	Nakashima, Hirotoyo
	Takeyama, Masao
	Nakano, Takayoshi
DC.publisher	MDPI
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-07-12
DC.identifier	https://doi.org/10.3390/cryst11070809
DC.subject	Additive manufacturing
	Cellular precipitation reaction
	Electron beam powder bed fusion
	Microstructure
	Tensile properties
	Titanium aluminide
DC.description	Cho K., Odo H., Okamoto K., et al. Improving the tensile properties of additively manufactured β-containing tial alloys via microstructure control focusing on cellular precipitation reaction. Crystals, 11, 7, 809. https://doi.org/10.3390/cryst11070809.
DCTERMS.abstract	The effect of a two-step heat treatment on the microstructure and high-temperature tensile properties of β-containing Ti-44Al-4Cr (at%) alloys fabricated by electron beam powder bed fusion were examined by focusing on the morphology of α2/γ lamellar grains and β/γ cells precipitated at the lamellar grain boundaries by a cellular precipitation reaction. The alloys subjected to the first heat treatment step at 1573 K in the α + β two-phase region exhibit a non-equilibrium microstructure consisting of the α2/γ lamellar grains with a fine lamellar spacing and a β/γ duplex structure located at the grain boundaries. In the second step of heat treatment, i.e., aging at 1273 K in the β + γ two-phase region, the β/γ cells are discontinuously precipitated from the lamellar grain boundaries due to excess Cr supersaturation in the lamellae. The volume fraction of the cells and lamellar spacing increase with increasing aging time and affect the tensile properties of the alloys. The aged alloys exhibit higher strength and comparable elongation at 1023 K when compared to the as-built alloys. The strength of these alloys is strongly dependent on the volume fraction and lamellar spacing of the α2/γ lamellae. In addition, the morphology of the β/γ cells is also an important factor controlling the fracture mode and ductility of these alloys.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89778
citation_title	Improving the tensile properties of additively manufactured β-containing tial alloys via microstructure control focusing on cellular precipitation reaction
citation_author	Cho, Ken
	Odo, Hirotaka
	Okamoto, Keisuke
	Yasuda, Hiroyuki Y.
	Nakashima, Hirotoyo
	Takeyama, Masao
	Nakano, Takayoshi
citation_publisher	MDPI
citation_language	英語
citation_date	2021-07-12
citation_journal_title	Crystals
citation_volume	11
citation_issue	7
citation_firstpage	809
citation_doi	https://doi.org/10.3390/cryst11070809
citation_public_url	https://hdl.handle.net/11094/89778

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