Processing and properties of CuAl₂ intermetallic coatings

Abstract

CuAl 2 intermetallic powders were consolidated using an atmospheric plasma spraying process. Based on X-ray diffractometry results, no phase change occurred during thermal spraying. The investigation of optical micrographs showed that about 7% porosity was present in the microstructure of the coatings. The coatings showed hardness value up to 575 HV(50 g). The polarisation tests and electrochemical spectroscopy measurements were utilised for electrochemical investigation of the coatings in 1 M H 2 SO 4 and 3.5% NaCl media. In H 2 SO 4 environment, the coated and uncoated samples showed similar corrosion rates. However, the coating showed a lower corrosion rate than the substrate in NaCl solution by an order of magnitude. Corrosion of the steel substrate occurred in the NaCl solution, no corrosion was observed in the H 2 SO 4 .

Influence of processing conditions on the properties of thermal sprayed coating: a review

“…The higher value of coating modulus was owing to the increase of cohesion b/w the splats. Abbasi et al [47] examined the micro-hardness, microstructure, fracture toughness and corrosion performance of atmospheric plasma sprayed CuAl 2 intermetallic coating. The as-sprayed coating showed porosity (7%), micro-hardness (575HV), and lower corrosion rate as compared to base steel in NaCl solution.…”

Copper-aluminium joining by novel locked projection welding process

“…In dissimilar copper-aluminium RSW, these properties and phenomena have two main consequences. On the one hand, the formed intermetallic layer (IML) is characterised by a low fracture toughness [1,2], roughly two orders of magnitude lower than that of the base materials, leading to brittle joint failure. Especially cross tension loaded RSW are susceptible to such brittle failure, as suboptimal mode I loading occurs at the notch surrounding the RSW joint.…”

Corrosion of 2024 alloy after ultrasonic impact cladding with iron

“…In addition to good corrosion behaviour, the iron aluminides possess low density and low material cost. A crystal structure, stability, hardness, and corrosion resistance of the Fe x Al y phases depend on the iron content [3,[6][7][8][9][10].…”