A guidewire having a first region having a first property, a second region having a second property different than the first property and a joint formed by a niobium coated nickel titanium alloy sleeve joined onto a first section of the first region and a second section of the second region. A method of joining two metal components for forming a guidewire is also provided including placing a first and second metal component into a sleeve, the first sleeve composed of a nickel titanium alloy and having niobium deposited thereon, and increasing the temperature of the first sleeve so the niobium reacts to form a joint joining the first and second components.
