Effect of Brazing Conditions on Microstructure and Mechanical Properties of Al2O3/Tie6Ale4V Alloy Joints Reinforced by TiB Whiskers

doi:10.1016/j.jmst.2013.05.009

J. Mater. Sci. Technol.

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Effect of Brazing Conditions on Microstructure and Mechanical Properties of Al₂O₃/Tie6Ale4V Alloy Joints Reinforced by TiB Whiskers

Minxuan Yang^1,2), Peng He¹⁾, Tiesong Lin¹⁾

1) State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2) Beijing Power Machinery Research Institute, Beijing 100074, China

Received:2012-04-04 Revised:2012-10-20 Online:2013-10-30 Published:2013-10-16
Contact: T. Lin
Supported by:
National Natural Science Foundation of China (Grant Nos. 51275135, 51105107 and 51021002), the Natural Science Foundation of Heilongjiang Province, China (Grant No.QC2011C044) and the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No.20112302130005)

Abstract

Abstract:

Al₂O₃ and Ti–6Al–4V alloy were brazed with Ag–Cu–Ti + B fillers in different brazing conditions. Effects of brazing temperature, holding time and additive Ti content on joints microstructure and shear strength were investigated by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, transmission electron microscopy and shear testing. Results indicate that TiCu and Ti(Cu,Al) decrease, but Ti₂Cu and Ti₂(Cu,Al) increase in brazing seam with increasing brazing temperature, holding time and additive Ti content. Area consisting of Ti₃(Cu,Al)₃O and TiO near Al₂O₃ becomes gradually discontinuous from continuity when brazing temperature rises or holding time extends. As Ti additive content increases, TiO is absent near Al₂O₃; area consisting of only Ti₃(Cu,Al)₃O thickens. TiB whiskers are in situ synthesized by Ti and B atoms during brazing process. The brazing temperature, holding time and additive Ti content on joints microstructure influence the joints shear strength directly. The shear strength of joints, obtained at 850 °C holding for 10 min, reaches the maximum of 78 MPa. According to the experimental results, phase diagram and thermodynamics calculation, the interface evolution mechanism of the Al₂O₃/Ti–6Al–4V alloy joint was analyzed.

Key words: Active brazing, Addition of B and Ti, Al2O3, Tie6Ale4V alloy

Minxuan Yang, Peng He, Tiesong Lin. Effect of Brazing Conditions on Microstructure and Mechanical Properties of Al₂O₃/Tie6Ale4V Alloy Joints Reinforced by TiB Whiskers[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.05.009.

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Effect of Brazing Conditions on Microstructure and Mechanical Properties of Al₂O₃/Tie6Ale4V Alloy Joints Reinforced by TiB Whiskers

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