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The mobility of high-angle grain boundaries is typically higher than that of low-angle grain boundaries. This is because as the distance between dislocations becomes smaller than a critical value, grain boundaries migrate via diffusion of atoms across the boundary. In contrast, if dislocations are distant from one another, the grain boundaries migrate at a relatively low velocity that is proportional to the dislocation mobility. ¡¾·Òë¡¿´ó½Ç¾§½ç±ÈС½Ç¾§½çµÄÇ¨ÒÆÒª¸ü¿ì¡£ÕâÊÇÒòΪ´ó½Ç¾§½çµÄλ´í¼ä¾à±ÈÁÙ½çÖµ»¹Ð¡£¬¾§½çÊÇͨ¹ý¾§½ç´¦Ô×ÓÀ©É¢½øÐÐÇ¨ÒÆµÄ£»¶øÐ¡½Ç¾§½çµÄλ´í¼ä¾à½Ï´ó£¬¾§½çÒÔÕý±ÈÓÚλ´íÇ¨ÒÆµÄ½ÏµÍËÙ¶ÈÇ¨ÒÆ¡£ |
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The mobility of high-angle grain boundaries is typically higher than that of low-angle grain boundaries. This is because as the distance between dislocations becomes smaller than a critical value, grain boundaries migrate via diffusion of atoms across the boundary. In contrast, if dislocations are distant from one another, the grain boundaries migrate at a relatively low velocity that is proportional to the dislocation mobility. ¡¾·Òë¡¿´ó½Ç¾§½ç ±È С½Ç¾§½çµÄ ¡¾»ú¶¯ÐÔÒª¸ü¸ß¡¿¡£ÕâÊÇÒòΪ¡¾Ëæ×Å¡¿´ó½Ç¾§½çµÄ λ´í¼ä¾à ¡¾±äµÃСÓÚij¸ö¡¿ÁÙ½çÖµ£¬¾§½ç ÊÇͨ¹ý ¾§½ç´¦ Ô×ÓÀ©É¢ ½øÐÐÇ¨ÒÆµÄ£»¡¾Ïà·´¡¿¡¾Èç¹û¡¿ λ´í¼ä¾à½Ï´ó£¬¾§½ç¡¾»áÒÔÓë´íÎ»Ç¨ÒÆÕýÏà¹ØµÄ¡¿½ÏµÍµÄËÙ¶ÈÇ¨ÒÆ¡£ |
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