Microstructural Modification and property improvement of boride/Ti-6Al-4V surface-alloyed materials fabricated by high-energy electron-beam irradiation |
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Authors: | Kwangjun Euh Jongmin Lee Sunghak Lee |
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Affiliation: | (1) the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784 Pohang, Korea;(2) the Materials Science and Engineering Department, Pohang University of Science and Technology, Korea |
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Abstract: | The present study is concerned with the fabrication and microstructural analysis of boride/Ti-6Al-4V surface-alloyed materials
using the irradiation of a high-energy electron beam. Mixtures of TiB2 or MoB powders and CaF2 flux were placed on a Ti-6Al-4V alloy substrate and subsequently irradiated using a high-energy electron beam. Specimens
processed with a flux mixing ratio of 40 wt pct showed that the melted region of 1.1 to 1.5 mm in thickness was homogeneously
formed without defects and contained a large amount of titanium borides (TiB). The formation of TiB in the melted region greatly
improved the Vickers hardness, high-temperature Vickers hardness, and wear resistance to levels 2 or 3 three times higher
than the those for the Ti alloy substrate. Also, the addition of MoB powders into the mixtures made possible the fabrication
of surface-alloyed materials with various properties by controlling the kind, size, and volume fraction of TiB and the characteristics
of the matrix. These findings suggested that surface alloying using high-energy electron-beam irradiation was economical and
useful for the development of boride/Ti-6Al-4V surface-alloyed materials with improved properties. |
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