Electrochemical Noise Response of Cr2Nb Powders Applying Mechanical Alloying

Abstract

Cr2Nb alloys are potential candidates for high-temperature structural materials. The influence of different mechanical alloying parameters (milling time) and sintering processes were studied. After mechanical alloying and observation by scanning electron microscope (SEM), nano powders were characterized and then sintered by spark plasma sintering (SPS). Electrochemical noise (EN) tests were also conducted in order to study the electrochemical behavior. From the current experimental results, it was revealed that ball milling times up to 20 h may explain the influence of Nb–Cr alloys and its association to the Laves phase and corrosion behavior. These insights aimed at improving the samples’ predicted behavior before spending time and resources at high-temperature industrial processes.

Aluminium-Silicon Lightweight Thermal Management Alloys with Controlled Thermal Expansion

“…Mechanical alloying was first developed in the 1960s with the aim of fabricating a nickel-based superalloy with homogeneous distribution of oxide reinforcements for gas turbine applications [13]. Since then, many material combinations have been explored [14][15][16][17][18][19][20][21][22][23][24][25][26]. The basic principle is the cyclical welding and fracture of ductile and brittle powders via repetitive impact, resulting in a distribution of reinforcement within the metallic matrix particles [27].…”

“…The basic principle is the cyclical welding and fracture of ductile and brittle powders via repetitive impact, resulting in a distribution of reinforcement within the metallic matrix particles [27]. Optimization of key parameters is however necessary to achieve a homogeneous and stable process [24][25][26]28,29]. This composite powder then acts as an input into downstream consolidation processes such as Hot Isostatic Pressing (HIP) or extrusion.…”

Aluminium-Silicon Lightweight Thermal Management Alloys with Controlled Thermal Expansion

“…Mechanical alloying was first developed in the 1960s with the aim of fabricating a nickel-based superalloy with homogeneous distribution of oxide reinforcements for gas turbine applications [13]. Since then, many material combinations have been explored [14][15][16][17][18][19][20][21][22][23][24][25][26]. The basic principle is the cyclical welding and fracture of ductile and brittle powders via repetitive impact, resulting in a distribution of reinforcement within the metallic matrix particles [27].…”

“…The basic principle is the cyclical welding and fracture of ductile and brittle powders via repetitive impact, resulting in a distribution of reinforcement within the metallic matrix particles [27]. However, the optimization of key parameters is necessary to achieve a homogeneous and stable process [24][25][26]28,29]. This composite powder then acts as an input into downstream consolidation processes, such as hot isostatic pressing (HIP) or extrusion.…”