Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract The beta-alpha phase transformation has been studied in hot pressed boron doped SiC (HP SiC). The microstructure has been characterized using optical microscopy, scanning and transmission electron microscopy. The influence of the sintering times and temperatures on the crystalline structure of the materials has been checked. The phase transformation which occurs during the sintering involves the formation of feathers. These feathers, constituted by two adjacent alphas grains, can be described as mechanical twins. Three different twinning laws have been observed. To check the influence of the external pressure on the feathers formation, the previous study in pressureless boron doped SiC (PS SiC) has been completed by a new investigation. The results obtained in both PS and HP boron doped SiC show that the external pressure has no influence on the microstructure of the feathers.
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