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