Wear and thermal properties of Zr-based amorphous surface alloyed materials fabricated by high-energy electron beam irradiation

• Published in: Journal of alloys and compounds 2005-09, Vol.400 (1), p.171-177
• Main Authors: Lee, Kyuhong, Euh, Kwangjun, Lee, Sunghak, Kim, Nack J.
• Format: Article
• Language: English
• Subjects: Amorphous alloy; Applied sciences; Crystalline phase particle; Exact sciences and technology; Hardness; High-energy electron beam irradiation; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metallic coatings; Metals. Metallurgy; Production techniques; Surface alloyed material; Surface treatment; Thermal barrier coating
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2005.03.074

Zr-based amorphous surface alloyed materials were fabricated by high-energy electron beam irradiation in this study. A mixture of Zr-based amorphous powders and LiF + MgF 2 flux was deposited on a pure copper substrate, and then an electron beam was directed on this powder mixture to fabricate a one-layered surface alloyed material. A two-layered surface alloyed material was also fabricated by irradiating electron beam again onto the powder mixture deposited on the one-layered surface alloyed material. The microstructural analysis results indicated that a number of coarse crystalline phase particles were formed in the one-layered surface alloyed layer, whereas a small amount of fine and hard crystalline particles were homogeneously distributed in the amorphous matrix of the two-layered surface alloyed layer. Owing to these fine and hard crystalline particles, the hardness and wear resistance of the two-layered surface alloyed layer improved over the one-layered surface alloyed layer or other kinds of surface alloyed layers. The thermal conductivity of the two-layered surface alloyed layer was much lower than that of titanium-alloy-based or stainless-steel-based surface alloyed layers. These findings suggested the possibility of applying Zr-based amorphous surface alloyed materials to high wear-resistant thermal barrier coatings or parts.