Effect of Mn Contents on the Phase Transition of the High Entropy Alloy Prepared by Laser Cladding

Abstract:

Al_1.3FeCoNiCuCr high entropy alloy (HEA) coatings were prepared by pre-placed laser cladding on 921A steel substrate, and the study on the phase transition of the Al_1.3FeCoNiCuCr coating due to the introduction of Mn was conducted. The combination of TEM and XRD results showed that the Al_1.3FeCoNiCuCr HEA coatings without Mn addition typically consisted of two kinds of grains, i.e., one is composed of only FCC phase, and the another is a mixture of BCC and FCC phases. The two phases were of similar ratio in the coatings, while nanoparticulate precipitates were observed in the bcc phase. When 3 wt. % Mn was introduced into the alloy, the coatings consisted of also FCC and BCC phase. However, most of the grains were in FCC phase, while the BCC phase with a lath shape only distributed between the FCC phases. High hardness nanobanded precipitates were observed in the FCC phase. It is clearly revealed that the phase structure of Al_1.3FeCoNiCuCr coatings undergoes a dramatic transition due to the introducing of Mn.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 64-70
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.64
• Online since: March 2016
• Authors: Shi Da Liu, Cun Yuan Peng, Ming Xing Ma, Wen Jin Liu, Wei Ming Zhang
• Keywords: High Entropy Alloy Coating, Laser Cladding, Mn Addition, Phase Structure

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