In this work, wear and scratch behavior of four different bulk metallic glasses (BMGs) namely Zr41.2Cu12.5Ni10Ti13.8Be22.5 (LM 1), Zr57Cu15.4Ni12.6Al10Nb5 (LM 106), Ni60Pd20P17B3 (Ni-BMG), and Pt57.5Cu14.7Ni5.3P22.5 (Pt-BMG) were compared. Shear band formation on the edges of the scratch groove with spallation was found to be the primary failure mechanism in progressive scratch tests. The wear behavior and the scratch response of model binary Ni-P metallic glasses was systematically studied as a function of composition, with amorphous alloy formation over the narrow range of 10 at% to 20 at% phosphorus. Pulsed current electrodeposition was used to obtain these binary amorphous alloys, which offers a facile and versatile alternative to conventional melt quenching route. The electrodeposited metallic glasses (EMGs) showed hardness values in the range of 6.6-7.4 GPa, modulus in the range of 155-163 GPa, and friction coefficient around 0.50. Among the studied alloys, electrodeposited Ni80P20 showed the lowest wear rate. The wear mechanism was determined to be extensive plastic deformation along with mild ploughing, micro tears, and formation of discontinuous lubricious oxide patches. The effect of phosphorus content on the structure, mechanical properties, and the tribological response was systematically investigated for biocompatible Co-P metallic glasses. With increase in phosphorus content, there was an increase in hardness, hardness/modulus, wear resistance, and scratch resistance following the trend: Co80P20 > Co90P10 > Pure Co. The Co-P electrodeposited amorphous alloys showed enhanced wear resistance that was two orders of magnitude better than SS 316 and Ti-based alloys in simulated physiological environment. The wear mechanisms were determined to be a combination of abrasive and surface fatigue wear in both dry and physiological environments. Decreased platelet adhesion and more extracellular matrix deposition indicated that Co80P20 electrodeposited alloy had excellent blood compatibility and pre-osteoblast adhesion response. These results suggest the potential use of Co-P metallic glasses as superior bio implant materials with better durability compared to the state-of-the-art.

El objetivo general del trabajo fue realizar aportaciones al conocimiento dinamométrico y electromiográfico de la articulación del codo. Para ello se analizó la fuerza isométrica máxima y su variabilidad inter e intraobservador, así como el comportamiento electromiográfico de bíceps y tríceps en diferentes ejercicios dinámicos sobre una población de 23 sujetos sanos. Se determinó también la influencia del género y de la dominancia. Los resultados de las mediciones dinamométricas mostraron valores más altos de fuerza isométrica en los varones, observándose una alta correlación con la talla y el peso corporal. Un CCI>0.71 en todas las mediciones demostró la fiabilidad y reproductibilidad de este método a 90º de flexión. No se encontraron diferencias en cuanto a la lateralidad. La actividad EMGs aumentó con la carga e intensidad del ejercicio dinámico, principalmente en el bíceps. Se demostró la gran influencia del sexo y la dominancia sobre los resultados. / The aim of this study was to make contributions to the knowledge of isometric dynamometry and surface electromyography of the elbow joint. We analyzed the maximal isometric force and inter-intraobserver variability also the electromyographic behavior of biceps and triceps brachii in different dynamic exercises on a population of 23 healthy people. We determined the influence of gender and dominance too. Dynamometric measurements showed higher values of isometric strength in men, showing a high correlation with height and body weight. An ICC>0.71 for all measurements demonstrated the reliability and reproducibility of this method at 90º of elbow flexion. There were no differences between dominant and nondominant side. The sEMG activity increased with the load and intensity of dynamic exercise mainly in the biceps brachii. It showed the great influence of sex and dominance on the results.