a friction stir tool is provided to perform friction stir riveting using a partially consumable pin , wherein the pin includes a cutting edge on a bottom surface thereof , wherein the tool is rotated at a first speed to enable cutting by the pin into a first material that is overlapping a second material , wherein after the pin has cut to a sufficient depth , the rotational speed of the tool is increased to thereby enable plasticization of the consumable pin , the first material , and the second material , wherein the tool is then rapidly decelerated until stopped , enabling diffusion bonding between the pin , the first material and the second material .