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Microstructural evolution in H-implanted polycrystalline α-SiC upon thermal annealing at temperature 1100℃ is studied.After annealing,the samples are examined via cross-sectional transmission electron microscopy (XTEM) analysis.H2 gas bubbles are formed during H implantation and some H2 molecules are released from the bubble to form cavities during thermal annealing.The distribution and size of the observed cavities are related to the implantation fluence.The results are compared to H implanted single cr:ystal SiC and He implanted polycrystalline α-SiC.The possible reasons are discussed.