Buttwelding of Mg-Cu-Gd Bulk Metallic Glass using a High-brightness Fiber Laser

Terajima, Takeshi; Kimura, Hisamichi; Inoue, Akihisa

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タイトル	Buttwelding of Mg-Cu-Gd Bulk Metallic Glass using a High-brightness Fiber Laser
著者	Terajima, Takeshi Terajima, Takeshi
	Kimura, Hisamichi Kimura, Hisamichi
	Inoue, Akihisa Inoue, Akihisa
キーワード等	Mg-based metallic glass
	fiber laser
	buttwelding
抄録	The light metal based metallic glass Mg₆₅Cu₅₅Gd₁₀ has low specific gravity and excellent mechanical properties and thus is expected to be a useful structural material. However, welding of Mg₆₅Cu₂₅Gd₁₀ is difficult since it immediately crystallizes if the quench rate is lower than the critical value. In this study, a high-brightness fiber laser with an ultrahigh power density of several megawatts per square millimeter, which corresponds to the power density of an electron beam and is a well suited for this purpose, is examined for welding Mg₆₅Cu₅₅Gd₁₀. The laser beam was transmitted through an optical fiber and focused on the butt surface of the Mg₆₅Cu₂₅Gd₁₀ rods that were synchronously rotated at 3000 rpm at 0.5 MPa. The molten alloy that forms following laser irradiation was extruded from the joint, and the specimens were successfully welded. The microstructure observed by micro-focus X-ray diffraction showed that the crystalline phase was not present inside the joint but was in the extruded region. The success of the proposed welding is likely attributable to the pressure applied to the specimens, which plays an important role in extruding the crystalline phase from the joint.
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	39
号	1
開始ページ	61
終了ページ	64
刊行年月	2010-09
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/8220
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.39 No.1 (2010-09)

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.39(1) P.61-P.64
DC.title	Buttwelding of Mg-Cu-Gd Bulk Metallic Glass using a High-brightness Fiber Laser
DC.creator	Terajima, Takeshi
	Kimura, Hisamichi
	Inoue, Akihisa
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	2010-09
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/8220
DC.subject	Mg-based metallic glass
	fiber laser
	buttwelding
DCTERMS.abstract	The light metal based metallic glass Mg₆₅Cu₅₅Gd₁₀ has low specific gravity and excellent mechanical properties and thus is expected to be a useful structural material. However, welding of Mg₆₅Cu₂₅Gd₁₀ is difficult since it immediately crystallizes if the quench rate is lower than the critical value. In this study, a high-brightness fiber laser with an ultrahigh power density of several megawatts per square millimeter, which corresponds to the power density of an electron beam and is a well suited for this purpose, is examined for welding Mg₆₅Cu₅₅Gd₁₀. The laser beam was transmitted through an optical fiber and focused on the butt surface of the Mg₆₅Cu₂₅Gd₁₀ rods that were synchronously rotated at 3000 rpm at 0.5 MPa. The molten alloy that forms following laser irradiation was extruded from the joint, and the specimens were successfully welded. The microstructure observed by micro-focus X-ray diffraction showed that the crystalline phase was not present inside the joint but was in the extruded region. The success of the proposed welding is likely attributable to the pressure applied to the specimens, which plays an important role in extruding the crystalline phase from the joint.
citation_title	Buttwelding of Mg-Cu-Gd Bulk Metallic Glass using a High-brightness Fiber Laser
citation_author	Terajima, Takeshi
	Kimura, Hisamichi
	Inoue, Akihisa
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2010-09
citation_journal_title	Transactions of JWRI
citation_volume	39
citation_issue	1
citation_firstpage	61
citation_lastpage	64
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/8220
citation_keywords	Mg-based metallic glass
	fiber laser
	buttwelding

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