Infrared brazing of Fe3Al intermetallic compound using gold-based braze alloy |
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| Authors: | Ren-Kae Shiue Shyi-Kaan Wu and I-Hong Li |
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| Affiliation: | (1) Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan;(2) Department of Mechanical Engineering, National Taiwan University, Taipei, 106, Taiwan; |
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| Abstract: | Infrared-brazing Fe3Al with Au–44Cu as filler metal has been investigated. The brazed joint consists mainly of a β-phase, Au8 − x
Cu4 + x
Al4, caused by the dissolution of Al from Fe3Al substrate into the braze alloy. The depletion of Al from Fe3Al substrate results in the formation of a layer of β-phase particles dispersed in the Fe-rich phase. The highest shear strength
for AuCu filler is 327 MPa for specimens infrared brazed at 880°C for 180 s. The brazed joint is mainly fractured along the
central β-phase in which the fractograph exhibits quasi-cleavage with dimples. Increasing the brazing time or temperature
will deteriorate the bonding strength of the joint, and the fracture mode is prone to cleavage of brittle fracture. Au–44Cu
filler demonstrates a great potential for bonding Fe3Al intermetallic compound. |
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