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Open AccessArticle

Effect of Boron Doping on Cellular Discontinuous Precipitation for Age-Hardenable Cu–Ti Alloys

1
Kansai Center, Institute for Materials Research, Tohoku University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
2
Department of Materials Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
3
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 9577-8531, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Maryam Tabrizian
Materials 2015, 8(6), 3467-3478; https://doi.org/10.3390/ma8063467
Received: 7 April 2015 / Revised: 25 May 2015 / Accepted: 9 June 2015 / Published: 11 June 2015
(This article belongs to the Section Manufacturing Processes and Systems)
The effects of boron doping on the microstructural evolution and mechanical and electrical properties of age-hardenable Cu–4Ti (at.%) alloys are investigated. In the quenched Cu–4Ti–0.03B (at.%) alloy, elemental B (boron) is preferentially segregated at the grain boundaries of the supersaturated solid-solution phase. The aging behavior of the B-doped alloy is mostly similar to that of conventional age-hardenable Cu–Ti alloys. In the early stage of aging at 450 °C, metastable β′-Cu4Ti with fine needle-shaped precipitates continuously form in the matrix phase. Cellular discontinuous precipitates composed of the stable β-Cu4Ti and solid-solution laminates are then formed and grown at the grain boundaries. However, the volume fraction of the discontinuous precipitates is lower in the Cu–4Ti–0.03B alloy than the Cu–4Ti alloy, particularly in the over-aging period of 72–120 h. The suppression of the formation of discontinuous precipitates eventually results in improvement of the hardness and tensile strength. It should be noted that minor B doping of Cu–Ti alloys also effectively enhances the elongation to fracture, which should be attributed to segregation of B at the grain boundaries. View Full-Text
Keywords: Cu–Ti alloy; boron; discontinuous precipitate; aging; strengthening Cu–Ti alloy; boron; discontinuous precipitate; aging; strengthening
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Semboshi, S.; Ikeda, J.; Iwase, A.; Takasugi, T.; Suzuki, S. Effect of Boron Doping on Cellular Discontinuous Precipitation for Age-Hardenable Cu–Ti Alloys. Materials 2015, 8, 3467-3478.

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