लेखक: Sam Allen

ROBERT W. BALLUFEI, SCD, is Professor of Physical Metallurgy, Emeritus, Department of Materials Science and Engineering, Massachusetts Institute of Technology. SAMUEL M, ALLEN. PHD, is Professor of Physical Metallurgy, Department of Materials Science and Engineering, Massachusetts Institute of Technology. W. CRAIG CARTER. PHD. is Professor of Materials Science and Engineering, Department of Materials Science and Engineering, Massachusetts Institute of Technology.