中文摘要：

晶界内耗是中国科学家葛庭燧开创的一个研究领域．以往晶界内耗的研究主要是用多晶试样进行的．最近作者用不同取向差的双晶试样研究了单个晶界的内耗，取得了一些新的结果．文章综述了研究晶界内耗的意义以及新近的进展．

英文摘要：

Grain boundary internal friction is a research field developed by the Chinese scientist Ge Ting-Sui （T. S. Kg）. Previous investigations were mainly performed with polycrystals, but recently we have studied the internal friction of a single boundary by using bicrystals with different misorientations, and some new results have been obtained. The significance of these investigations and other recent progress are reviewed.