Effects of Annealing Temperature on Textures and Corrosion Resistance

Abstract:

Abstract: The evolution of macro-texture of hafnium bars at different annealing temperatures was investigated by X-ray diffraction (XRD).The morphology and composition of corrosion products of hafnium bars at 360℃/18.6Mpa water was investigated by scanning electron microscope (SEM) and X-ray energy spectrum analysis (EDS) and X-ray photoelectron spectroscopy (XPS). The results shows that four types of textures appear on the RD-TD plane of the hot-rolled hafnium bars,appear as axial complex textures. The texture of the basal﹛0002﹜shows a strong heredity in each stage, and the rest of the textures has changed differently. The corroded layer of the hafnium bars is formed by stacking oxide particles from 10 to 100 nanometers, the corrosion rate of prismatic {10-10} annealed texture is faster than basel{0002}annealed texture. The corroded layer preferentially forms Hf(4-x)+ oxide, Hf(4-x)+ loses electrons and becomes Hf4+,forming HfO2 with oxygen during the growth .