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Microstructure Evolution and Mechanical Properties of Ti–43Al–9V–0.3Y Alloy Joints Brazed With Ti–Zr–Ni–Cu + Mo Composite Filler
Author(s) -
Wang Ying,
Qiu Qiwen,
Yang Zhenwen,
Wang Dongpo
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500549
Subject(s) - brazing , materials science , microstructure , eutectic system , shear strength (soil) , alloy , composite number , metallurgy , joint (building) , composite material , brittleness , solid solution , filler metal , architectural engineering , environmental science , arc welding , welding , soil science , engineering , soil water
Ti–Zr–Ni–Cu + Mo composite filler with the Mo content from 0 to 10 wt% is developed to braze Ti–43Al–9V–0.3Y (at%) alloy. The effects of Mo content and brazing time on the microstructure and mechanical properties of the brazed joints are investigated. Four phases, including γ‐(Ti, Zr)2(Cu, Ni), β‐Ti, α2‐Ti3Al, and B2, formed in the brazed joint. The Mo additive inhibits the eutectoid transformation of β phase during cooling. The joint microstructure becomes fine and homogeneous with the increase of Mo content. The shear strength of the joints firstly increases and then decreases with the increase of Mo content and brazing time. The maximum shear strength of 268 MPa is obtained for the joint brazed with Ti–Zr–Ni–Cu + 8wt% Mo at 1 000 °C for 20 min. The fracture is brittle and primarily propagated in γ matrix nearby α2‐Ti3Al.