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Title: Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

Abstract

Microstructural features developed along with mechanical properties in furnace brazing of Ti-6Al-4V alloy using STEMET 1228 (Ti-26.8Zr-13Ni-13.9Cu, wt.%) and STEMET 1406 (Zr-9.7Ti-12.4Ni-11.2Cu, wt.%) amorphous filler alloys. Brazing temperatures employed were 900-950 Degree-Sign C for the titanium-based filler and 900-990 Degree-Sign C for the zirconium-based filler alloys, respectively. The brazing time durations were 600, 1200 and 1800 s. The brazed joints were evaluated by ultrasonic test, and their microstructures and phase constitutions analyzed by metallography, scanning electron microscopy and X-ray diffraction analysis. Since microstructural evolution across the furnace brazed joints primarily depends on their alloying elements such as Cu, Ni and Zr along the joint. Accordingly, existence of Zr{sub 2}Cu, Ti{sub 2}Cu and (Ti,Zr){sub 2}Ni intermetallic compounds was identified in the brazed joints. The chemical composition of segregation region in the center of brazed joints was identical to virgin filler alloy content which greatly deteriorated the shear strength of the joints. Adequate brazing time (1800 s) and/or temperature (950 Degree-Sign C for Ti-based and 990 Degree-Sign C for Zr-based) resulted in an acicular Widmanstaetten microstructure throughout the entire joint section due to eutectoid reaction. This microstructure increased the shear strength of the brazed joints up to the Ti-6Al-4V tensile strength level.more » Consequently, Ti-6Al-4V can be furnace brazed by Ti and Zr base foils produced excellent joint strengths. - Highlights: Black-Right-Pointing-Pointer Temperature or time was the main factors of controlling braze joint strength. Black-Right-Pointing-Pointer Developing a Widmanstaetten microstructure generates equal strength to base metal. Black-Right-Pointing-Pointer Brittle intermetallic compounds like (Ti,Zr){sub 2}Ni/Cu deteriorate shear strength. Black-Right-Pointing-Pointer Ti and Zr base filler alloys were the best choice for brazing Ti-6Al-4V.« less

Authors:
 [1];  [2];  [3];  [1];  [4]
  1. Materials Division, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran (Iran, Islamic Republic of)
  2. Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran (Iran, Islamic Republic of)
  3. Department of Material Engineering, Science and Research Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of)
  4. Department of Electrical and Electronics Engineering, UNAM - National Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey)
Publication Date:
OSTI Identifier:
22163123
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 71; Journal Issue: Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRAZED JOINTS; BRAZING; CHEMICAL COMPOSITION; FILLERS; INTERMETALLIC COMPOUNDS; MICROSTRUCTURE; SCANNING ELECTRON MICROSCOPY; SEGREGATION; SHEAR PROPERTIES; TENSILE PROPERTIES; TITANIUM; X-RAY DIFFRACTION; ZIRCONIUM

Citation Formats

Ganjeh, E., E-mail: navidganjehie@sina.kntu.ac.ir, Sarkhosh, H., Bajgholi, M.E., Khorsand, H., and Ghaffari, M.. Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.05.016.
Ganjeh, E., E-mail: navidganjehie@sina.kntu.ac.ir, Sarkhosh, H., Bajgholi, M.E., Khorsand, H., & Ghaffari, M.. Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys. United States. doi:10.1016/J.MATCHAR.2012.05.016.
Ganjeh, E., E-mail: navidganjehie@sina.kntu.ac.ir, Sarkhosh, H., Bajgholi, M.E., Khorsand, H., and Ghaffari, M.. Sat . "Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys". United States. doi:10.1016/J.MATCHAR.2012.05.016.
@article{osti_22163123,
title = {Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys},
author = {Ganjeh, E., E-mail: navidganjehie@sina.kntu.ac.ir and Sarkhosh, H. and Bajgholi, M.E. and Khorsand, H. and Ghaffari, M.},
abstractNote = {Microstructural features developed along with mechanical properties in furnace brazing of Ti-6Al-4V alloy using STEMET 1228 (Ti-26.8Zr-13Ni-13.9Cu, wt.%) and STEMET 1406 (Zr-9.7Ti-12.4Ni-11.2Cu, wt.%) amorphous filler alloys. Brazing temperatures employed were 900-950 Degree-Sign C for the titanium-based filler and 900-990 Degree-Sign C for the zirconium-based filler alloys, respectively. The brazing time durations were 600, 1200 and 1800 s. The brazed joints were evaluated by ultrasonic test, and their microstructures and phase constitutions analyzed by metallography, scanning electron microscopy and X-ray diffraction analysis. Since microstructural evolution across the furnace brazed joints primarily depends on their alloying elements such as Cu, Ni and Zr along the joint. Accordingly, existence of Zr{sub 2}Cu, Ti{sub 2}Cu and (Ti,Zr){sub 2}Ni intermetallic compounds was identified in the brazed joints. The chemical composition of segregation region in the center of brazed joints was identical to virgin filler alloy content which greatly deteriorated the shear strength of the joints. Adequate brazing time (1800 s) and/or temperature (950 Degree-Sign C for Ti-based and 990 Degree-Sign C for Zr-based) resulted in an acicular Widmanstaetten microstructure throughout the entire joint section due to eutectoid reaction. This microstructure increased the shear strength of the brazed joints up to the Ti-6Al-4V tensile strength level. Consequently, Ti-6Al-4V can be furnace brazed by Ti and Zr base foils produced excellent joint strengths. - Highlights: Black-Right-Pointing-Pointer Temperature or time was the main factors of controlling braze joint strength. Black-Right-Pointing-Pointer Developing a Widmanstaetten microstructure generates equal strength to base metal. Black-Right-Pointing-Pointer Brittle intermetallic compounds like (Ti,Zr){sub 2}Ni/Cu deteriorate shear strength. Black-Right-Pointing-Pointer Ti and Zr base filler alloys were the best choice for brazing Ti-6Al-4V.},
doi = {10.1016/J.MATCHAR.2012.05.016},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 71,
place = {United States},
year = {2012},
month = {9}
}