TEM OF DISLOCATIONS IN ALN

被引：26

作者：

SEIFERT, A ^{[1
]}

BERGER, A ^{[1
]}

MULLER, WF ^{[1
]}

机构：

[1] TH DARMSTADT,INST MINERAL,W-6100 DARMSTADT,GERMANY

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1992年 / 75卷 / 04期

关键词：

D O I：

10.1111/j.1151-2916.1992.tb04153.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Sintered AIN specimens were deformed by Vickers hardness (HV) indentations. Compared with Al2O3 the HV hardness values indicate a much higher plasticity of AIN at room temperature, but above 600-degrees-C a higher ductility for Al2O3. Deformed AIN specimens were examined by transmission electron microscopy. Basal and prismatic glide with the slip systems (0001) <1120BAR> and {1100BAR} <1120BAR> were frequently observed. This results in four linearly independent slip systems. The critical resolved shear stress for single prismatic slip seems to be even smaller than for basal slip. However, thermally activated dislocation reactions are frozen up to at least 1000-degrees-C. Thus, prismatic slip is suppressed as soon as more than one slip direction is activated.

引用

页码：873 / 877

页数：5

共 18 条

[1]

ALPERT CP, 1991, J AM CERAM SOC, V71, pC371

[2] DISLOCATIONS SLIP AND FRACTURE IN BEO SINGLE CRYSTALS [J].