Phase identification and fracture strength of plasma brazed joints of Ti-45Al-2Nb-2Mn-1B with Ti-Ni-Cu filler metals

Plasma brazing of gamma based Ti-45Al-2Nb-2Mn-1B titanium aluminide was investigated using Ti-NiCu filler metals.

The joints consisted of irregular or equiaxed grain of a2-Ti3Al phases which contained needle-like or fine particles of s3-Al3NiTi2 particles.

With increasing Ni from 15 to 25 wt% in filler metals, the shear fracture strength of the joints increased from ~120 to ~300 MPa. However, the microhardness of the joints area (410–550 HV) was higher than that of Ti-45Al-2Nb-2Mn-1B base alloy (350–400 HV).

The joints and base alloy were compatible and no cracking occurred in the joints.

This paper is published in journal of Materials Letters.

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