Abstract
Ni(V)/Al multilayer covered with Ag-based braze alloy (NanoFoil®) was applied for joining parts made of Ti6Al4V alloy. The reaction of multilayers was started with electric current pulse (0.5A, 9V). The transmission electron microscopy (TEM) observations of joint area, backed by analysis of the electron diffractions, showed that the initial Ni(V)/Al multilayer transformed into fine grain (~150nm) of B2-NiAl intermetallic phase. The silver-based braze alloy layer from top and bottom of Ni(V)/Al multilayer, located itself mostly at the B2-NiAl/Ti6Al4V interface as Ag-rich precipitates, but small amounts out-diffused into B2-NiAl as intergranular veins. The Ti6Al4V close to the B2-NiAl is subject to strain high enough to fill it with platelets of α″-Ti martensite.
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