Improvement in Tensile Property of Ti64 Composites with VGCFs Fabricated by Powder Metallurgy

Pripanapong, Patchara; Mimoto, Takanori; Li, Shu-feng; Imai, Hisashi; Umeda, Junko; Kondoh, Katsuyoshi

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タイトル	Improvement in Tensile Property of Ti64 Composites with VGCFs Fabricated by Powder Metallurgy
著者	Pripanapong, Patchara Pripanapong, Patchara
	Mimoto, Takanori Mimoto, Takanori
	Li, Shu-feng Li, Shu-feng
	Imai, Hisashi Imai, Hisashi
	Umeda, Junko Umeda, Junko
	Kondoh, Katsuyoshi Kondoh, Katsuyoshi
キーワード等	Ti64
	VGCFs
	Powder metallurgy
	Spark plasma sintering
	Solid solution strengthening
抄録	Ti-6Al-4V (Ti64) composite reinforced with vapor grown carbon fibers (VGCFs) was fabricated by a powder metallurgy (P/M) route in this research. Ti64 powder was mixed with VGCFs in four compositions such as 0.1, 0.2, 0.3 and 0.4 wt%, and consolidated by spark plasma sintering (SPS), followed by a hot extrusion process. The microstructure observation was carried out by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure was changed from full lamellar to bimodal after the addition of VGCFs. Almost all VGCFs reacting with Ti and turned into Ti6C3.75 compounds. Hardness was improved by the effect of solid solution strengthening of carbon in the Ti matrix and reached the maximum value of 495.8Hv. 0.2%YS and UTS were also significantly increased after adding 0.1wt% of VGCFs, but never much improved when more VGCF content was applied. Ductility of the sample was affected by a change in microstructure when 0.1 wt% of VGCFs was added, bimodal microstructures showed higher ductility compared to full lamellar structures. The relationship between fracture morphology after tensile testing and original microstructure could also be observed. At 0.1wt% of VGCFs, a good balance between strength and ductility of Ti64/VGCFs composite can be improved simultaneously.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	42
号	1
開始ページ	27
終了ページ	31
刊行年月	2013-06
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/26596
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.42 No.1 (2013-06)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.42(1) P.27-P.31
DC.title	Improvement in Tensile Property of Ti64 Composites with VGCFs Fabricated by Powder Metallurgy
DC.creator	Pripanapong, Patchara
	Mimoto, Takanori
	Li, Shu-feng
	Imai, Hisashi
	Umeda, Junko
	Kondoh, Katsuyoshi
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2013-06
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/26596
DC.subject	Ti64
	VGCFs
	Powder metallurgy
	Spark plasma sintering
	Solid solution strengthening
DCTERMS.abstract	Ti-6Al-4V (Ti64) composite reinforced with vapor grown carbon fibers (VGCFs) was fabricated by a powder metallurgy (P/M) route in this research. Ti64 powder was mixed with VGCFs in four compositions such as 0.1, 0.2, 0.3 and 0.4 wt%, and consolidated by spark plasma sintering (SPS), followed by a hot extrusion process. The microstructure observation was carried out by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure was changed from full lamellar to bimodal after the addition of VGCFs. Almost all VGCFs reacting with Ti and turned into Ti6C3.75 compounds. Hardness was improved by the effect of solid solution strengthening of carbon in the Ti matrix and reached the maximum value of 495.8Hv. 0.2%YS and UTS were also significantly increased after adding 0.1wt% of VGCFs, but never much improved when more VGCF content was applied. Ductility of the sample was affected by a change in microstructure when 0.1 wt% of VGCFs was added, bimodal microstructures showed higher ductility compared to full lamellar structures. The relationship between fracture morphology after tensile testing and original microstructure could also be observed. At 0.1wt% of VGCFs, a good balance between strength and ductility of Ti64/VGCFs composite can be improved simultaneously.
citation_title	Improvement in Tensile Property of Ti64 Composites with VGCFs Fabricated by Powder Metallurgy
citation_author	Pripanapong, Patchara
	Mimoto, Takanori
	Li, Shu-feng
	Imai, Hisashi
	Umeda, Junko
	Kondoh, Katsuyoshi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2013-06
citation_journal_title	Transactions of JWRI
citation_volume	42
citation_issue	1
citation_firstpage	27
citation_lastpage	31
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/26596
citation_keywords	Ti64
	VGCFs
	Powder metallurgy
	Spark plasma sintering
	Solid solution strengthening

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