Dry-Sliding Wear Behavior of (TiZrNbTa)90Mo10 High-Entropy Alloy Against Al2O3
Received date: 2020-01-20
Revised date: 2020-04-28
Online published: 2020-05-15
Supported by
National Natural Science Foundation of China(51571192)
Degenerative and inflammatory joint disease including osteoarthritis, rheumatoid arthritis and chondromalacia affect more and more people. The standard treatment nowadays is arthroplasty, such as total hip replacement (THR). The material selection for the combination of bearing surfaces is a critical issue to determine the life quality of patients with THR. High entropy alloy (HEA) is expected to be a candidate material owing to its appreciated mechanical properties. A new HEA, (TiZrNbTa)90Mo10 alloy was developed recently, but its tribological behavior is still unclear. Using ball-on-plate reciprocating sliding approach, dry sliding wear behavior of arc-melted (TiZrNbTa)90Mo10 HEA against Al2O3 was investigated, together with two conventional implant alloys, Ti6Al4V and Co28Cr6Mo, for comparison. The wear mechanism of these alloys was revealed by characterizing the morphology of worn track, wear debris and scar on counterpart ball. It was shown that, under dry sliding condition, the coefficient of friction (f) of the HEA was determined to be 0.8~0.9, which is nearly double of that of either Ti6Al4V or Co28Cr6Mo, and is insensitive to the applied loading. Meanwhile, specific wear rate of this HEA is approximately 2.3 and 90 times of that of Ti6Al4V and Co28Cr6Mo, respectively, which means that wear resistance of the former is inferior to the two latter under the current conditions. As indicated, wear mechanism of the HEA is dependent on the applied loading. The abrasive wear is predominant under lower-level loading, whereas the third-body abrasive wear took place and played a remarkable role as the loading increased. It is noteworthy that such a complex mechanism is considerably different from that of either Ti6Al4V or Co28Cr6Mo. Furthermore, it is of interest to note that the advantage in mechanical properties of the current HEA, such as high strength and high hardness, is not necessarily to offer its excellent wear resistance, at least under the current tribological condition. It is proposed as future work to screen the appreciate materials as counterpart for this HEA and to characterize its wear behavior under a condition containing lubricant medium such as physiological fluid.
Key words： high-entropy alloy; Al2O3; tribology; wear; biomedical metal
Qianting SONG , Yingkun XU , Jian XU . Dry-Sliding Wear Behavior of (TiZrNbTa)90Mo10 High-Entropy Alloy Against Al2O3[J]. Acta Metall Sin, 2020 , 56(11) : 1507 -1520 . DOI: 10.11900/0412.1961.2020.00031
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