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Materials 2017, 10(4), 415; doi:10.3390/ma10040415

Grain Boundary Character Dependence on Nucleation of Discontinuous Precipitates in Cu-Ti Alloys

1
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
2
Department of Materials Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai 599-8531, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 13 March 2017 / Revised: 10 April 2017 / Accepted: 11 April 2017 / Published: 15 April 2017
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Abstract

The dependence of the grain boundary character distribution for a Cu-4 at. % Ti polycrystal alloy (average grain size: 100 µm) on the nucleation of cellular discontinuous precipitates was systematically investigated. In an alloy over-aged at 723 K, cellular discontinuous precipitates consisted of a terminal Cu solid solution and a stable β-Cu4Ti lamellae nucleated at grain boundaries. Electron backscatter diffraction analysis revealed that the discontinuous precipitation reaction preferentially occurred at random grain boundaries with a Σ value of more than 21 according to the coincidence site lattice theory. On the other hand, few cellular discontinuous precipitates nucleated at low-angle and low-Σ boundaries, particularly twin (Σ 3) boundaries. These findings suggest that the nucleation of discontinuous precipitates is closely correlated with grain boundary character and structure, and hence energy and/or diffusibility. It should therefore be possible to suppress the discontinuous precipitation reaction through control of the alloy’s grain boundary energy, by means of texture control and third elemental addition. View Full-Text
Keywords: Cu alloy; aging; grain boundary; discontinuous precipitation; electron backscattering diffraction; misorientation; Σ value Cu alloy; aging; grain boundary; discontinuous precipitation; electron backscattering diffraction; misorientation; Σ value
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MDPI and ACS Style

Semboshi, S.; Sato, M.; Kaneno, Y.; Iwase, A.; Takasugi, T. Grain Boundary Character Dependence on Nucleation of Discontinuous Precipitates in Cu-Ti Alloys. Materials 2017, 10, 415.

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