Slip and twinning in polycrystalline alumina (α-Al2O3) deformed under hydrostatic pressure between 600° and 1000°C
Slip and twinning in polycrystalline alumina (α-Al2O3) deformed under hydrostatic pressure between 600° and 1000°C
复制标题
DOI：
10.1111/j.1151-2916.2003.tb03342.x
复制
发表时间：
2003-04-01
影响因子：
3.9
通讯作者：
Castaing, J
中科院分区：
文献类型：
--
作者：
Korinek, SL;Castaing, J
用透射电镜研究了多晶氧化铝在静水压和低温下变形后的显微结构。变形主要以棱柱面滑移和菱面体孪晶方式发生。氢的引入导致屈服应力的显著降低。在用氢变形的大晶粒尺寸氧化铝中，孪生的调节涉及孪晶界和晶粒中的位错反应，而不是通过开裂。棱柱面位错通过交叉滑移分解为基底位错，这可能是由于氢的存在降低了基底滑移的Peierls应力。
The microstructure of polycrystalline alumina deformed under hydrostatic pressure and at low temperature is investigated by transmission electron microscopy. Deformation occurs mainly by prism plane slip and rhombohedral twinning. Introduction of hydrogen leads to a significant decrease in the yield stress. In large grain size alumina deformed with hydrogen, accommodation of twinning involves dislocation reactions in the twin boundary and in the grains rather than by cracking. Prism plane dislocations decompose into basal dislocations by cross slip probably due to a decrease of Peierls stress for basal slip in the presence of hydrogen.