Abstract
Effects of B addition on the intragranular and cellular precipitations in a Cu-2 mass%Be alloy on aging at 523 and 623 K after quenching from 1093 K were investigated by means of hardness measurements, optical and electron microscopic observations, and X-ray analysis. The results obtained are as follows: The addition of 0.02-0.1 mass%B suppressed the formation of G.P. zones and retarded the precipitation of γ′ phase. The lattice parameter of the α solid solution of the B added alloy increased with the B addition. This result suggests that B exists interstitially in the α solid solution and suppresses the formation of G.P. zones and retards the precipitation of γ′ phase as a result of the strong interaction with vacancies. The formation and growth of grain boundary cells were suppressed by the addition of 0.02-0.05%B, but promoted by the excess addition of B, 0.1%.
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