Microstructure and wear studies of laser clad Al-Si/SiC(p) composite coatings

Abstract

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. and Si increase the hardness of the material by dispersion hardening but do not contribute to its abrasive wear resistance, because they are softer than the abrasive particles, and confirm that the parameters used to prepare Al-Si-SiC composite coatings by laser cladding must be selected so that only minimal reactions occur between SiC and molten Al.

Fabrication of Surface-Hybrid-MMCs Layer on Aluminum Plate by Friction Stir Processing and Its Wear Characteristics

“…Reihani 10) fabricated Al6061/SiC with squeeze casting and the hardness was about 85 HV. On the other hand Anandkumar 11) surfaced the Al-Si (90 HV) alloy with SiC particles by laser cladding and the hardness reached 120 HV.…”

“…[6][7][8][9] The widely used particles for reinforcing Al alloys are silicon carbide (SiC) and alumina (Al 2 O 3 ). [10][11][12][13][14][15] Besides their high hardness, they show low density and low cost comparing with other reinforcements. In the past two decades, the wear resistance of the aluminum alloys reinforced with SiC and Al 2 O 3 in many forms (particles, whiskers and fibers) and sizes has been described by a huge body of publications.…”

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Most studies [6][7][8][9][10][11][12][13][14][15][16] proved that SiC was more effective than Al 2 O 3 in the improvement of wear resistance of the resultant aluminum composite due to its higher hardness. [6][7][8][9][10][11][12][13][14][15][16] On the other hand, some investigations [17][18][19][20] suggested that Al/Al 2 O 3 composites were more stable and inert, and had better corrosion and high temperature behavior than Al/SiC. [17][18][19][20] In this sense, it may become practical to use both SiC particles and Al 2 O 3 particles (hybrid) as reinforcements to gain both of their benefits for improving the composite properties.…”

“…16) It was reported in many works [10][11][12][21][22][23][24][25] that the hybrid composites of SiC and Al 2 O 3 exhibited better wear resistance than those reinforced only with the SiC or Al 2 O 3 . [10][11][12][21][22][23][24][25] It is generally known that the fabrication of SMMCs by traditional fusion surfacing techniques such as laser beam and thermal spraying may lead to the deterioration of MMCs properties. [26][27][28][29][30] In the case of Al 2 O 3 , the Al 2 O 3 may decompose to Al and oxygen gas (forming porosities) on contact with liquid aluminum in addition to the tendency of the Al 2 O 3 particle to clustering.…”

Effect of Laser Remelting and Simultaneous Application of Ultrasonic Vibrations during Laser Melting on the Microstructural and Tribological Properties of Laser Clad Al-SiC Composites

“…The microstructures of the laser clad zone revealed the presence of an acicular needle-like phase. The formation of needle-like phase is a common feature in laser surface engineering of Al-SiC composites and has been widely reported to be a eutectic acicular α-Si phase [20][21][22]. Also, the acicular α-Si phase is observed to nucleate from the SiC particles [23].…”