Transmission electron microscopy analysis of worn alumina hip replacement prostheses

被引:14
作者
Zeng, P. [1 ]
Rainforth, W. M. [1 ]
Inkson, B. J. [1 ]
Stewart, T. D. [2 ]
机构
[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
[2] Univ Leeds, Sch Mech Engn, Leeds LS2 9JT, W Yorkshire, England
基金
英国工程与自然科学研究理事会;
关键词
Alumina; Hip replacement prosthesis; TEM; Wear debris; EDX; PLASTIC-DEFORMATION; CERAMIC COMPONENTS; SLIDING WEAR; GRAIN-SIZE; ARTHROPLASTY; MICROSEPARATION; JOINTS; TRANSITION; OSTEOLYSIS; SIMULATOR;
D O I
10.1016/j.actamat.2012.01.009
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Explanted worn alumina orthopaedic hip replacements show characteristic wear regions, ranging from severe wear, dominated by intergranular fracture, to regions in which minimal damage has occurred during articulation. The surface damage accumulation mechanisms are complex and not fully understood. This paper presents a detailed transmission electron microscopy (TEM) study of the surface damage accumulation mechanisms following in vitro tested worn alumina hip replacement prostheses. TEM of focused ion beam cross-section samples indicated extensive surface dislocation activity, which is restricted in the outer grain layer. Except for one example of basal slip, all slips were found to be on pyramidal planes. Both inter- and transgranular cracks were observed in regions of high wear. Grooves, largely associated with third-body abrasion, were generally associated with extensive dislocation activity. Three types of wear debris were seen from the worn surface, namely: granular wear debris, nanocrystalline wear debris and oblong wear debris. Wear debris were shown to arise from grain pull-out and severe plastic deformation at the surface. The observations allow a mechanistic model of the damage accumulations leading to wear and ultimately failure. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:2061 / 2072
页数:12
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