Provided is a multilateral junction. The multilateral junction, in one aspect, includes a y-block. The multilateral junction additionally includes a mainbore leg coupled to the y-block, the mainbore leg defining a second overlapping space, and a lateral bore leg coupled to the y-block, the lateral bore leg defining a third overlapping space. The multilateral junction, in this aspect, additionally includes an expanded metal joint located in at least a portion of the second overlapping space or the third overlapping space, the expanded metal joint comprising a metal that has expanded in response to hydrolysis.