Influence of spark plasma sintering temperature on the densification and micro-hardness behaviour of Ni-Cr-Al alloy

Abstract

Sintering temperature is essential towards attaining desired densification and formation of phases which in turn influences the microstructure and properties of a material. In this study, the densification and microhardness behaviour of Ni-Cr-Al alloy prepared by spark plasma sintering (SPS) at different sintering temperatures were investigated. After sintering operation, the density, hardness, phase analysis, and microstructural evolution were investigated using the Archimede’s principle, hardness tester, X-ray diffraction (XRD), and scanning electron microscopy (SEM) respectively. The nickel based alloy was sintered at temperatures of 600, 750, 950 and 1100 °C. The results indicated that the densification, microstructure, and hardness values were influenced by changes in the sintering temperature. The relative density increased from 73.89 % at 600 °C to 99.89 % at 1100 °C, while the hardness value was enhanced from 131.9 ± 2.8 HV to 404 ± 1.2 HV respectively.

Process Optimization of Spark Plasma Sintered Parameters for Ti-Al-Cr-Nb-Ni-Cu-Co High Entropy Alloy by Response Surface Methodology

“…It applies the effect of statistical mathematical approach using the UDD-RSM to optimize the various processing parameters needed to improve the mechanical properties of the designed HEAs. However, numerous researchers have demonstrated the dependability of this method [24][25][26]. Tables 2 and 3 show the build-up information of the proposed model and the operating conditions of the coded and actual factors respectively.…”

Mechanical and Microstructural Behavior of Sintered NiAl-Based High Entropy Alloy

“…With the strong bond between Nickel and Aluminium at an elevated temperature, NiAl can efficiently contend with ceramics or superalloys due to its remarkable characteristics at high temperatures and good strength. In comparison to the traditional nickel-based superalloys, the NiAl-based alloy has demonstrated better thermomechanical characteristics and good corrosion, wear, and creep resistance [1][2][3][4][5][6]. A recent study has focused on Nickel-Aluminide, an intermetallics; comprising Aluminium and Nickel.…”

Optimization of process parameters for the development of Ni–Al-Ti-Mn-Co-Fe–Cr high entropy alloy system via spark plasma sintering

“…This bond has generated outstanding properties at an extreme temperature and good strength that could effectively compete with superalloys and ceramics. The NiAl-based alloy has shown superior thermomechanical properties, excellent corrosion, wear, and creep resistance compared to the conventional nickel-based superalloys [1][2][3][4][5][6]. Nickel-aluminide is an intermetallic compound containing aluminium and nickel and has been the focus of recent researchers.…”