Microstructural Characteristics of Al-Cr Coated Zr Alloy Fabricated by Laser Surface Melting Process

Jeong-Min Kim; Jae-Cheol Lee; Il-Hyun Kim; Hyun-Gil Kim

doi:10.3740/MRSK.2017.27.10.563

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Microstructural Characteristics of Al-Cr Coated Zr Alloy Fabricated by Laser Surface Melting Process 레이저 표면 용융공정으로 Al-Cr 코팅한 Zr합금의 미세조직 특성

October 2017. pp. 563-568

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Abstract

In this study, the coating of an Al-Cr layer on the surface of a Zircaloy-4 alloy was carried out through plasma pretreatment coating and a laser surface melting process. Two different conditions for laser treatment, severe or minimal surface melting of the Zr alloy substrate, were applied to form the final coating. When there was significant surface melting of the Zr alloy, the solidification microstructure of the newly formed coating layer was mainly composed of needle-shaped Al₃Zr, Al(Cr) and Al₇Cr phases. On the other hand, the solidification microstructure of the coating layer was mainly composed of Al(Cr) and Al₇Cr phases when there was minimal surface melting of Zr base in the laser process. However, when the coating was maintained at 1100 °C for 2 hours, significant inter-diffusion occurred between the phases in the coating. As a result, the upper part of the coating layer was observed to mainly consist of Al₃Zr and Al₈Cr₅ phases, regardless of the laser treatment conditions.

Keywords

Al-Cr

Zr alloy

laser surface melting

microstructure

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 27
No :10
Pages :563-568
Received Date : 2017-08-21
Revised Date : 2017-09-22
Accepted Date : 2017-09-23
DOI :https://doi.org/10.3740/MRSK.2017.27.10.563

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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