(TiZrNbTa)90Mo10高熵合金与Al2O3干摩擦条件下的滑动磨损行为

doi:10.11900/0412.1961.2020.00031

金属学报

2020, Vol. 56

Issue (11): 1507-1520 DOI: 10.11900/0412.1961.2020.00031

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(TiZrNbTa)₉₀Mo₁₀高熵合金与Al₂O₃干摩擦条件下的滑动磨损行为

宋芊汀¹^,², 徐映坤¹, 徐坚¹(

)

1 中国科学院金属研究所沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016

Dry-Sliding Wear Behavior of (TiZrNbTa)₉₀Mo₁₀ High-Entropy Alloy Against Al₂O₃

SONG Qianting¹^,², XU Yingkun¹, XU Jian¹(

)

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

宋芊汀, 徐映坤, 徐坚. (TiZrNbTa)₉₀Mo₁₀高熵合金与Al₂O₃干摩擦条件下的滑动磨损行为[J]. 金属学报, 2020, 56(11): 1507-1520.
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.

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摘要:

采用“球-板”式往复滑动方式，研究了电弧熔炼态bcc结构 (TiZrNbTa)₉₀Mo₁₀高熵合金与Al₂O₃球在干摩擦条件下的摩擦磨损行为，并与Ti6Al4V和Co28Cr6Mo 2种合金进行了对比。通过对磨痕、磨屑、磨球表面形貌的表征，揭示出该高熵合金在摩擦学和磨损机制上的特征。结果表明，(TiZrNbTa)₉₀Mo₁₀高熵合金与Al₂O₃干滑动摩擦的摩擦系数(f)为0.8~0.9，约是同条件下Ti6Al4V和Co28Cr6Mo合金与Al₂O₃摩擦体系的2倍。(TiZrNbTa)₉₀Mo₁₀高熵合金的比磨损率约是Ti6Al4V合金的2.3倍，是Co28Cr6Mo合金的90倍，即耐磨性不如后2种合金；其磨损机制因施加载荷的大小而异，低载荷下以磨粒磨损为主，高载荷下三体磨粒磨损的作用愈显突出，在磨损机制上明显不同于Ti6Al4V和Co28Cr6Mo。该高熵合金在高强度和高硬度上的优势并未保证其拥有良好的耐磨性，与之相适宜的低摩擦磨损对磨副材料仍有待于进一步研究。

关键词 ：高熵合金, Al₂O₃, 摩擦学, 磨损, 生物医用金属

Abstract：

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

收稿日期: 2020-01-20

ZTFLH:

TG146

基金资助:国家自然科学基金项目(51571192)

作者简介: 宋芊汀，男，1992年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00031 或 https://www.ams.org.cn/CN/Y2020/V56/I11/1507

图1 在不同干摩擦载荷条件下，TiZrNbTaMo-HEA、Ti6Al4V、Co28Cr6Mo 3种合金与Al2O3对磨的摩擦系数(f)随时间变化曲线

图2 干摩擦条件下TiZrNbTaMo-HEA、Ti6Al4V、Co28Cr6Mo合金与Al2O3球对磨的f与载荷之间的关系

图3 在干摩擦条件下，TiZrNbTaMo-HEA、Ti6Al4V、Co28Cr6Mo 3种合金与Al2O3球往复式对磨3600 s后体积损失与载荷之间的关系

图4 在不同干摩擦载荷下，TiZrNbTaMo-HEA与Al2O3球往复式对磨3600 s后试样表面磨痕的三维激光测量显微镜照片

图5 在不同干摩擦载荷下，TiZrNbTaMo-HEA、Ti6Al4V、Co28Cr6Mo合金与Al2O3球往复式对磨3600 s后，试样表面磨痕中心区域横截面沿纵深方向的二维轮廓线

图6 在干摩擦条件下，TiZrNbTaMo-HEA、Ti6Al4V、Co28Cr6Mo合金与Al2O3球往复式对磨3600 s后，表面磨痕的宽度和深度随载荷的变化

图7 在2、10、20 N载荷下，TiZrNbTaMo-HEA与Al2O3球对磨3600 s后，试样表面磨痕区域的SEM像

图8 在10 N干摩擦载荷条件下Ti6Al4V和Co28Cr6Mo合金与Al2O3球对磨3600 s后的SEM像

图9 在不同载荷下与Al2O3球对磨后，由TiZrNbTaMo-HEA表面磨屑的SEM像

图10 在2、10和20 N载荷下，与TiZrNbTaMo-HEA对磨后，Al2O3球表面磨损区域的SEM像

图11 在干摩擦条件下与TiZrNbTaMo-HEA和Ti6Al4V合金对磨后，Al2O3对磨球的体积损失与载荷之间的关系及与合金体积损失之间的关系

图12 在干摩擦条件下与Al2O3球往复式对磨3600 s后，TiZrNbTaMo-HEA、Ti6Al4V、Co28Cr6Mo合金的比磨损率和Vickers硬度比较

表1 根据式(3)计算得出不同对磨副在不同载荷下的最大接触应力 (MPa)

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