Nanoindentation Study of Pop-in Phenomenon Characteristics and Mechanical Properties of Sapphire (10(1)over-bar2) Crystal

被引:38
作者
Mao, Weiguo [1 ,2 ]
Shen, Yaogen [1 ]
机构
[1] City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China
[2] Xiangtan Univ, Key Lab Low Dimens Mat & Applicat Technol, Minist Educ, Xiangtan 411105, Hunan, Peoples R China
关键词
CONTACT-INDUCED PLASTICITY; SURFACE DEFORMATION; SINGLE-CRYSTALS; ANISOTROPIC MATERIALS; INDENTATION MODULUS; ENERGY PRINCIPLE; ELASTIC-MODULUS; BASAL SLIP; BEHAVIOR; HARDNESS;
D O I
10.1111/j.1551-2916.2012.05405.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
The pop-in behavior and mechanical properties of sapphire crystal vertically indented to its rhombohedral R (10 (1) over bar2) plane were investigated by nanoindentation using a Berkovich indenter. Effect of loading rate on pop-in load and pop-in extension width was observed within the indentation depth of h < 120 nm. The indentation size effect (ISE) of hardness within an indentation depth of 60 nm was systematically analyzed using Nix-Gao and Al-Rub models. Our experiments provided the consistent evaluations of hardness (H = 27.5 GPa), true hardness (H-true = 68.9 GPa) at the non-ISE region and effective indentation modulus (M = 423 GPa) for the contact depth of h(c) > 20 nm. Using the Hertzian contact theory, Schmid's law, and energy principle of indentation, the possible dominant slip system, which mainly contributed to the first pop-in event when indented normal to the (10 (1) over bar2) plane, was estimated as {10 (1) over bar1} <(1) over bar2 (1) over bar0 >. The distributions of corresponding resolved shear stress and principal stresses at the slip plane were also estimated.
引用
收藏
页码:3605 / 3612
页数:8
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