Hardening of rhombohedral twinning in sapphire (α-Al2O3) by basal slip dislocations
Hardening of rhombohedral twinning in sapphire (α-Al2O3) by basal slip dislocations
复制标题
通过基底滑移位错硬化蓝宝石 (α-Al2O3) 中的菱面体孪晶
DOI：
10.1080/01418610208235680
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. D. Rodríguez
中科院分区：
文献类型：
--
作者：
J. Castaing;A. Muñoz;A. D. Rodríguez
摘要：由于菱形孪晶可以在低剪切应力t下繁殖，蓝宝石在中温条件下是弱的。位错是孪晶扩展的障碍。我们测量了T随位错密度的增加而增加。硬化本质上是由于与孪晶中位错合并相关的能量变化。光学显微镜观察到的微观结构与目前对孪晶扩展机制的理解是一致的。
Abstract Sapphire is weak at medium temperatures because rhombohedral twins can propagate under low shear stresses T. The introduction of a dislocation forest improves the strength of sapphire; dislocations are obstacles to twin propagation. We have measured the increase in T with the increase in dislocation density. The hardening is essentially due to the energy change associated with the incorporation of dislocations in the twins. The microstructure observed by optical microscopy is compatible with the current understanding of the mechanism for twin propagation.