a duplex stainless steel solid cube is composed of 50% delta ferrite (bcc structure) and 50% austenite (fcc structure). using a laser to melt and re-solidified the cube, the structure changes to a solid 100% delta ferrite bcc structure. how does the density change from the initial mixture to the final pure bcc structure? assume there are no mass loss, the size of the cube stays the same, and the atomic radius are equal for all phases at all stages.