The pathways of dynamic recrystallization in all-metal hip joints

被引：84

作者：

Büscher, R ^{[1
]}

Fischer, A ^{[1
]}

机构：

[1] Univ Duisburg Gesamthsch, Dept Mat Sci 2, D-47057 Duisburg, Germany

来源：

WEAR | 2005年 / 259卷

关键词：

recrystallization; nanocrystals; wear; artificial hip joints;

D O I：

10.1016/j.wear.2005.02.036

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 [机械工程];

摘要：

In the present study metal-on-metal (MoM) McKee-Farrar prostheses of the first generation were investigated by means of transmission electron microscopy (TEM). It was possible to observe the worn regions using a novel taper section preparation technique without producing any artefacts. Thereby, it could be shown that the wear in vivo leads to a reduction in grain size by a factor of up to 20,000. This is achieved by recrystallization via two pathways which act simultaneously within the subsurface regions. One is dominated by the metallurgical characteristics of the material and follows the gradient of the friction induced shear strains from the bulk towards the surface. The other one is merely acting within the tribological contact volume directly at the surface. Both mechanisms lead to a significant increase in strength. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：887 / 897

页数：11

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