STRESS RELAXATION 4 ZIRCONIUM AND ALLOYS 4 ZIRCONIUM METALLOGRAPHY - Lattice Defects 4 ACTIVATION ENTHALPY 2 ANELASTIC DEFORMATION 2 GRAIN-BOUNDARY SLIDING 2 HIGH TEMPERATURE 2 HIGH-TEMPERATURE INTERNAL FRICTION 2 METALLOGRAPHY - Lattice Defects 2 METALS AND ALLOYS 2 METALS TESTING - High Temperature 2 Microscopic Examination 2 PARTICLE-FREE GRAIN BOUNDARIES 2 RELAXATION PROCESSES 2 SELF-DIFFUSION COEFFICIENT 2 ZIRCALOY 4 2 ZIRCALOY-4 2 ZIRCONIUM AND ALLOYS - Deformation 2 ZIRCONIUM METALLOGRAPHY - Grain Growth 2 Zinc Metallography--Grain Boundaries 2 Zirconium Metallography--Grain Boundaries 2 Zirconium Tin Alloys--Grain Boundaries 2