Aging effect on microstructure of cold groove-rolled α′-type Ti-12 mass%V-2 mass%Al alloys studied by transmission electron microscopy

Sato, Kazuhisa; Matsumoto, Hiroaki; Chiba, Akihiko; Konno, J. Toyohiko

doi:https://doi.org/10.2320/matertrans.M2013463

Aging effect on microstructure of cold groove-rolled α′-type Ti-12 mass%V-2 mass%Al alloys studied by transmission electron microscopy

Sato, Kazuhisa; Matsumoto, Hiroaki; Chiba, Akihiko et al.

Materials Transactions, 2014, 55(5), 763-767

Number of Access:171（2025-06-07 02:30 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89448

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Title	Aging effect on microstructure of cold groove-rolled α′-type Ti-12 mass%V-2 mass%Al alloys studied by transmission electron microscopy
Creator	NRID 1000070314424 1000070314424 ORCID 0000-0001-9078-2541 0000-0001-9078-2541 researchmap permalink read0158304 read0158304 Scopus Author ID 55552977400 55552977400 CreatorName Sato, Kazuhisa
	NRID 1000040372312 1000040372312 CreatorName Matsumoto, Hiroaki
	NRID 1000000197617 1000000197617 CreatorName Chiba, Akihiko
	NRID 1000090260447 1000090260447 CreatorName Konno, J. Toyohiko
Subject	Cold groove rolling
	Electron tomography
	Recovery
	Titanium-vanadium-aluminum
	Transmission electron microscopy (TEM)
	α′-martensite
Abstract	Microstructure and phase decomposition of hexagonal α′ martensite in cold groove rolled (CGR) Ti-12 mass% V-2 mass% Al alloys have been studied by transmission electron microscopy and electron diffraction. Acicular structure of the α′ martensite changes into equiaxed α′ grains by CGR with a cold reduction of 75%. After aging at 573K for 500 h, local Moiré fringes disappear and diffraction rings become sharp due to recovery. However, Vickers hardness also increased in spite of the recovery. Partitioning of solute atoms and/or formation of fine precipitates can be possible cause for the observed age-hardening. Although a CGR alloy is characterized by a microstructure with polycrystalline equiaxed grains, following orientation relationship is locally observed between β precipitates and α grains after aging at 673 K: (101)β // (011̄1̄)α, [010]β // (101̄1)α. Electron tomography revealed a heterogeneous nucleation and growth of β precipitates in the deformed α′ matrix. © 2014 The Japan Institute of Metals and Materials.
Publisher	The Japan Institute of Metals and Materials
Source Title	Materials Transactions
Volume (Issue)	55(5)
Page	763-767
Date of Issued	2014-05-01
Language	English
Handle URL	https://hdl.handle.net/11094/89448
PISSN	13459678
eISSN	13475320
NCID	AA1151294X
NCID	AA12041816
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.2320/matertrans.M2013463
Access Rights	open access
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	Materials Transactions. 2014, 55(5), p. 763-767
DC.title	Aging effect on microstructure of cold groove-rolled α′-type Ti-12 mass%V-2 mass%Al alloys studied by transmission electron microscopy
DC.creator	Sato, Kazuhisa
	Matsumoto, Hiroaki
	Chiba, Akihiko
	Konno, J. Toyohiko
DC.publisher	The Japan Institute of Metals and Materials
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2014-05-01
DC.identifier	https://doi.org/10.2320/matertrans.M2013463
DC.subject	Cold groove rolling
	Electron tomography
	Recovery
	Titanium-vanadium-aluminum
	Transmission electron microscopy (TEM)
	α′-martensite
DCTERMS.abstract	Microstructure and phase decomposition of hexagonal α′ martensite in cold groove rolled (CGR) Ti-12 mass% V-2 mass% Al alloys have been studied by transmission electron microscopy and electron diffraction. Acicular structure of the α′ martensite changes into equiaxed α′ grains by CGR with a cold reduction of 75%. After aging at 573K for 500 h, local Moiré fringes disappear and diffraction rings become sharp due to recovery. However, Vickers hardness also increased in spite of the recovery. Partitioning of solute atoms and/or formation of fine precipitates can be possible cause for the observed age-hardening. Although a CGR alloy is characterized by a microstructure with polycrystalline equiaxed grains, following orientation relationship is locally observed between β precipitates and α grains after aging at 673 K: (101)β // (011̄1̄)α, [010]β // (101̄1)α. Electron tomography revealed a heterogeneous nucleation and growth of β precipitates in the deformed α′ matrix. © 2014 The Japan Institute of Metals and Materials.
DC.format	89448
citation_title	Aging effect on microstructure of cold groove-rolled α′-type Ti-12 mass%V-2 mass%Al alloys studied by transmission electron microscopy
citation_author	Sato, Kazuhisa
	Matsumoto, Hiroaki
	Chiba, Akihiko
	Konno, J. Toyohiko
citation_publisher	The Japan Institute of Metals and Materials
citation_language	English
citation_date	2014-05-01
citation_journal_title	Materials Transactions
citation_volume	55
citation_issue	5
citation_firstpage	763
citation_lastpage	767
citation_doi	https://doi.org/10.2320/matertrans.M2013463
citation_public_url	https://hdl.handle.net/11094/89448

Aging effect on microstructure of cold groove-rolled α′-type Ti-12 mass%V-2 mass%Al alloys studied by transmission electron microscopy

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