Varano R, Bobyn J D, Medley J B, Yue S
Department of Mining, Metals, and Materials Engineering, McGill University, 3610 University Street, Montreal, Quebec, Canada H3A 2B2.
J Biomed Mater Res B Appl Biomater. 2006 Feb;76(2):281-6. doi: 10.1002/jbm.b.30370.
The microstructure and its effect on the friction behavior of a medical grade wrought cobalt-chromium-molybdenum (CoCrMo) alloy for surgical implants were studied in this work. In particular, the effects of compression and carbon (C) content on the above characteristics were analyzed. Increasing amounts of deformation resulted in a decrease in the number of annealing twins in the microstructures. In addition, there was an increase in the volume fraction of the hexagonal closed-packed (HCP) phase due to a strain-induced transformation (SIT) from the metastable face-centered cubic (FCC) phase. The high C (HC) alloy had a lower volume fraction of this SIT phase. Friction studies conducted on these alloys revealed a higher coefficient of friction for the HC alloy and no significant effect of SIT on the friction characteristics.
在本研究中，对一种用于外科植入物的医用级锻造钴铬钼（CoCrMo）合金的微观结构及其对摩擦行为的影响进行了研究。特别地，分析了压缩和碳（C）含量对上述特性的影响。变形量的增加导致微观结构中退火孪晶数量减少。此外，由于亚稳面心立方（FCC）相的应变诱导转变（SIT），六方密排（HCP）相的体积分数增加。高碳（HC）合金中该SIT相的体积分数较低。对这些合金进行的摩擦研究表明，HC合金的摩擦系数较高，且SIT对摩擦特性没有显著影响。
