Structural Characterization of Cu10Mo Alloy Synthesized by Mechanical Alloying

Abstract

Copper and its alloys have good electrical and thermal conductivity as well as good resistance to corrosion [1] but it has a low mechanical strength. However, its mechanical strength can be improved by adding alloying elements by means of Mechanical Alloying (MA) and powder metallurgy [2][3][4][5].In this work we report the results of the Cu10Mo alloy, synthesized during 10 h by MA. The microstructural characterization was carried out by X-Ray Diffraction to identify the phases formed after MA process, the crystals size was determined by Rietveld method using the MAUD software [6]. This results were obtained with a value of chi 2 : 1.33 and Rwp = 8.28 respectively. Finally, analysis of Scanning electron microscopy (SEM) and Energy dispersive spectroscopy (EDS) were used to determine the morphology and chemical composition of the particles formed. Figure 1 shows the X-Ray results of the alloy. It is possible to observe the presence of different peaks, which correspond to the Cu and Mo elements. By other hand the Rietveld analysis showed a crystal size of 13 and 24 nm and a microdeformation of 38.5 x 10 -4 and 3.6 x 10 -6 R.M.S., for the Co and Mo respectively. Figure 2a shows the morphology of the particles analyzed by SEM. It can be observed a different morphology of the particles, the average size is ranking between 5-30 nm. The chemical composition of the particles can be observed in figure 2b where Cu and Mo peaks are observed. It is possible to observe that ther is not a presence a other peak, which can indicate contamination from the steel balls used during the milling, the quantification of the elements indicated that the particles are composed of 94.56% wt and 5.46% wt of Cu and Mo respectively.

Effects of Mo Concentration on the Structural and Corrosion Properties of Cu–Alloy

“…In line with previous research [3,4,15], the corrosion behavior of the Cu-20 wt% Mo alloy, synthesized in MA, sintered and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) was studied.…”

“…They also discovered that Cu 2 O is formed by a direct anodic reaction, and after 90-120 min a second layer of CuO is formed by precipitation. North and Pryor found Cu 2 O and Cu 2 (OH) 3 Cl formed in Cu, Cu-10Ni-1Fe-0.5Mn and Cu-30Ni-0.4Fe in boiling NaCl solution. In all these cases, the internal layer of Cu 2 O was formed by a direct anodic reaction and the upper layer of CuO or Cu 2 (OH) 3 Cl was formed by precipitation.…”

“…North and Pryor found Cu 2 O and Cu 2 (OH) 3 Cl formed in Cu, Cu-10Ni-1Fe-0.5Mn and Cu-30Ni-0.4Fe in boiling NaCl solution. In all these cases, the internal layer of Cu 2 O was formed by a direct anodic reaction and the upper layer of CuO or Cu 2 (OH) 3 Cl was formed by precipitation. Kato et al studied the corrosion mechanism of the Cu-9.4Ni-1.7Fe alloy in a saturated NaCl solution, and found by XRD analysis that the corrosion product developed on the surface of the Cu-Ni alloy had Cu 2 O and Cu 2 (OH) 3 Cl.…”

“…In all these cases, the internal layer of Cu 2 O was formed by a direct anodic reaction and the upper layer of CuO or Cu 2 (OH) 3 Cl was formed by precipitation. Kato et al studied the corrosion mechanism of the Cu-9.4Ni-1.7Fe alloy in a saturated NaCl solution, and found by XRD analysis that the corrosion product developed on the surface of the Cu-Ni alloy had Cu 2 O and Cu 2 (OH) 3 Cl. Therefore, in the case of the Cu-20 wt% Mo alloy, it would appear that the lower crystalline layer will be Cu 2 O and a mixture of CuO and Cu 2 (OH) 3 Cl in the form of the precipitates.…”

“…Many copper-based binary systems, such as Cu-Mo, appear to be immiscible in the solid and liquid state, and they do not form any compound or alloy using conventional methods [2]. A new method that can be used for the formation of this alloy, is Mechanical Alloying (MA), a simple and versatile method due to its ability to increase the free energy of the system and solid solubility at room temperature [3,4], through the high transfer of energy that occurs between the milling media and the powders to be alloyed [5].…”