熔体过热处理的弛豫过程和引起的不可逆过程使熔体状态变化出现滞后效应，从而影响定向凝固界面形态稳定性。

The influences of hysteresis and relaxation of melt superheat on the morphological stability of interface in directional solidification were described.

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结果HIFU辐照后肿瘤细胞立即发生凝固性坏死，电镜下亦见到不可逆的破坏。

Results Tumor cells underwent coagulation necrosis immediately after irradiation with HIFU. Irreversible destruction was observed under electron microscope.

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