COMPUTER CALCULATED PHASE DIAGRAMS FOR THE Ni-W-Al, Ni-Al-llf, Ni-Cr-Hf AND Co (Cr, Ni)-Ta-C SYSTEMS

摘要

Computer analysis of the W-Ni, W-Al, Ni-Al, Co-C, Ta-Co, Ta-C, Ta-Ni, Ta-Cr, Hf-Ni, Hf-Al, Hf-Cr, Al-W-Ni, Co-Ta-C, Al-Ni-Hf and H£-Cr-Ni systems has been carried out in order to predict the isothermal sections and liquidus projec¬tions for these systems. The present results indicate that the Al-W-Ni and Hf-Cr-Ni systems offer opportunities for the growth of in-situ composites by means of controlled solidification, while the Al-Ni-Hf system suffers from low melting ternary eutectics. Calculation of the temperature and composi¬tion of the Co-TaC eutectic results in reasonable agreement with experimental observations and has been extended to consider effects of nickel and chromium additions on the eutectic temperature and composition.