Quality and Microstructure Analysis of Ti-6AI-4V brazed joint with Ti-Based Filler by Ultrasonic test

The Ti–6Al–4V alloy brazed in a controlled atmosphere furnace, using an amorphous STEMET 1228 (Ti–27Zr–14Cu–13Ni, wt. %) brazing foil. Primarily, quality of the brazed joints evaluated by an ultrasonic test with „„Krautkramer Branson‟‟ thickness measurement technique and then effect of different temperature and time investigated on joint microstruc-ture and mechanical properties. The former by metallography, scanning electron microscope (SEM) and the latter by shear test. Original microstructure of the Ti–6Al–4V base metals did not altered using this braze alloy. The joints mainly consist of γ-Cu/Ni [Ti(Zr)]2 and λ-Lave(Cu/Ni)2[Ti,(Zr)] intermetallic compounds. Prolonging brazing time, results in replace-ment of these brittle phases with a fine acicular Widmanstatten structure dominating the en-tire joint due to redistribution of Cu and Ni from the braze alloy into the base metals. Opti-mum shear strength of the Ti–6Al-4V brazed joints were achieved 571 MPa at 950 °C - 30 min. From practical point of view, it was found that controlled atmosphere brazing of com-patible samples have located in a simple close chamber, maybe carried out as an effective and economic process.

Keywords:

Ultrasonic Test , Brazing , Microstructure , Mechanical Properties