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Zr기 필러메탈을 이용한 상용 순 티타늄(CP-Ti) 합금의 저온 브레이징 특성
선주현 ( J. H. Sun ),신승용 ( S. Y. Shin ),홍주화 ( J. W. Hong ) 한국열처리공학회 2016 熱處理工學會誌 Vol.29 No.1
Titanium and its alloys can be usually joined with brazing method. And the alloys should be brazed at low temperature to keep their original microstructure. In this study, the mechanical strength and microstructure of the CP-Ti joint-brazed with Zr54Ti22Ni16Cu8 filler metal having melting temperature of 774~783oC were investigated. The tensile strengths of the joint-brazed at 800oC with 100oC/min of cooling rate showed more than 400 MPa which was as high as base metal. The Widmanstatten structure consisting of Ti and Ti2Ni phase was observed in the joint area. However, the tensile strengths of the joint-brazed at 800oC with 15oC/min of cooling rate were decreased and the Ti, (Ti,Zr)2Ni and Ti2Ni phases were observed at the joint area. It is believed that the (Ti,Zr)2Ni laves phases could decrease the mechanical strength of the joint and the cooling rate should be controled to get high strength of the titanium joint. (Received December 3, 2015; Revised December 9, 2015; Accepted December 14, 2015)