Effect of Carbon-Nanotube Addition on Thermal Stability of Ti-Based Metallic Glass Composites

Abstract

The preparation of Ti50Cu28Ni15Sn7 metallic glass composite powders was accomplished by the mechanical alloying of a pure Ti, Cu, Ni, Sn and carbon nanotube (CNT) powder mixture after 8 h milling. In the ball-milled composites, the initial CNT particles were dissolved in the Ti-based alloy glassy matrix. The thermal stability of the amorphous matrix is affected by the presence of the CNT particles. Changes in Tg and Tx suggest deviations in the chemical composition of the glassy matrix due to a partial dissolution of the CNT species in the amorphous phase. The bulk metallic glass composite was successfully prepared by vacuum hot pressing the as-milled CNT/ Ti50Cu28Ni15Sn7 metallic glass composite powders. A significant hardness increase with the CNT additions was observed for the consolidated composite compacts.

The effect of sintering temperature on Cu-CNTs nano composites properties produced by PM method

“…Kima et al [19] reported a method to produce Cu-CNTs composites as called mechanical mixing process. In addition, ball milling has been a promising technique includes impact, fracture and welding of powders continuously during ball-powder-ball and ball-powder-container collisions to obtain optimum dispersion of powders [20][21][22] that has been used by a number of research groups [16,[22][23][24][25][26][27][28][29][30].…”

“…Therefore, copper is reinforced with materials which are able to improve its mechanical properties and overcome the problem of low strength of it [32,34]. In order to produce Cu-CNTs nanocomposites, various synthesis methods which improve the mechanical properties have been used such as electroless deposition [2,25], hot pressing [26][27], spark plasma sintering [1-2, 28, 35] and powder metallurgy [28,36] which includes mixing, cold compaction and sintering the starting powders. The sintering temperature of the cold compacts depends on the volume fraction and melting temperature of the constituent with lower melting point [29].…”

Plasma And Cold Sprayed Aluminum Carbon Nanotube Composites: Quantification Of Nanotube Distribution And Multi-Scale Mechanical Properties

“…Tibased BMG-CNT composites, processed by powder metallurgy, have shown 53% increase in hardness [75,76]. CNT reinforced Zr-based BMG prepared by melting and casting technique, show ~10% improvement in hardness and elastic modulus [23,87].…”

“…Hot pressing route has also been explored for processing CNT reinforced Ti-based BMG composite [75,76].…”

“…Ti-CNT [28] Mg-CNT [73] Fe 3 Al-CNT [74] Ti-BMG-CNT [75,76] 450% increase in hardness and 65% increase in elastic modulus in Ti-CNT [28] 9% increase in elastic modulus in Mg2wt.% CNT [73] Increased thermal stability and hardness (30%) in Ti-BMG-10wt.% CNT [75] Powder Metallurgy Spark plasma sintering (SPS) SPS of powders prepared by Mechanical alloying/novel dispersion methods Cu-CNT [19,[66][67][68] Al-CNT [31] 129% increase in tensile strength in Al5vol.% CNT [31] 200% increase in yield strength and 70% increase in elastic modulus of SPS of molecular level mixed Cu-5vol.% CNT [19] Deformation Processing…”