THE EFFECT OF ELASTIC-ANISOTROPY ON THE DIRECTION AND FACETING OF CHEMICALLY-INDUCED GRAIN-BOUNDARY MIGRATION IN AL2O3

被引：21

作者：

LEE, HY ^{[1
]}

KANG, SJL ^{[1
]}

YOON, DY ^{[1
]}

机构：

[1] KOREA ADV INST SCI & TECHNOL, DEPT NAT SCI & ENGN, TAEJON 305701, SOUTH KOREA

来源：

ACTA METALLURGICA ET MATERIALIA | 1993年 / 41卷 / 08期

关键词：

D O I：

10.1016/0956-7151(93)90330-U

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The coherency strain energy of a Fe2O3 diffusion zone is calculated to be maximum at the (0001) surface of Al2O3 grain. An Al2O3 single crystal has been diffusion bonded at its (0001) surface with a polycrystalline Al2O3 piece to form (0001) grain boundaries. When this specimen is heat-treated at 1600-degrees-C in the presence of Fe2O3, all of the (0001) grain boundaries migrate to the direction of the single crystal, producing behind them zones enriched with Fe2O3. The migrating (0001) boundaries show faceting due to the appearance of boundary segments with different orientations moving more slowly than the initial (0001) segment. These results are consistent with the coherency strain theory for the initiation and continuation of the migration.

引用

页码：2497 / 2502

页数：6

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