Laser surface alloying of aluminum with chromium powder by pulsed Nd:YAG laser

In this paper, laser surface alloying of AA6061 aluminum alloy with chromium was investigated. Chromium powder was pre-placed on Al substrate and subsequently laser alloyed using pulsed Nd:YAG laser with a maximum mean power of 400W at different output powers and scanning rates in the argon gas shielding. Optical and Scanning electron microscopy equipped with EDS analysis and XRD were used for characterization of the phases formed by laser alloying. Alloyed layer contained relatively large amounts of Al-Cr intermetallic compounds dispersed in a matrix of α-A1. The intermetallic compounds appeared in two needle-like and equiaxed cell morphologies, organized in a dense network. At 240W output power and scanning rate of 8 mm/s, a defect-free layer containing of Al7Cr and Al4Cr intermetallics was achieved.

کلیدواژه ها:

Laser Surface Alloying ، Aluminum alloy ، Chromium ، Intermetallic compound