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Intermetallic formation in a Ti–Cu dissimilar joint brazed using a Zr-based amorphous alloy filler
Ist Teil von
Intermetallics, 2010-04, Vol.18 (4), p.529-535
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2010
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Microstructural evolution of the Ti–Cu dissimilar joints brazed by a Zr
41.2Ti
13.8Cu
12.5Ni
10.0Be
22.5 (at.%) amorphous alloy filler was investigated at a temperature of 820
°C for 1–20
min. As the brazing time increased, the overall composition of the joint sensitively changed from Ti-rich to Cu-rich owing to the different reactivity of the Zr in the filler with the Ti and Cu in the base metals. Based on such time-dependent compositional change, the formation of the intermetallic phases in the joint was basically divided into three stages; Stage (1): formation of interfacial Ti
2Cu, Stage (2): formation of two-phase structure with Ti
2Cu/TuCu and Cu
2TiZr, and Stage (3): transformation to Cu-rich phases. At Stage (2), the joint was fully produced isothermally by directional phase transformations with fine dendritic and columnar two-phase structures, revealing the highest bonding strength due to its controlled intermetallic morphology.