Microstructure, Creep and Failure: A Program For Graduate Education and Research in High Temperature Materials

摘要

The accomplishments of the program are: (1) The growth of large amounts of the Ni-Cr lamellar composites in diameters up to 4 cm, with 1 cm a routine operation. The degree of perfection has been markedly improved, but 'single crystals' are not yet available. (2) The preparation of fine grained ZrO2 with greater density than that obtained by conventional hot pressing. (3) The setting up of several sets of fatigue equipment covering the range from room-temperature low-cycle testing in air to 800 degrees C in a vacuum of 10 to the 9th power torr or better. (4) The demonstration in various experiments on Ni-Cr composites of notable differences in uniaxial properties and in creep failure mechanisms and times caused by simple variations in microstructure. (5) The design, building and near completion of several pieces of complicated equipment by the graduate students. (Author)