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Grain boundary character distribution(GBCD) of cold-rolled Pb-Ca-based alloy during annealing

Weiguo Wang

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Abstract

The grain boundary character distribution(GBCD) of a cold-rolled Pb-0.1%Ca-1.5%(Sn-0.026%)Al alloy during annealing was investigated by means of electron back scatter diffraction.The results indicate straight ∑3 coherent twin boundaries of over 60%(all values are given as a length fraction of the total boundary length) are introduced in the alloy when annealed at 220℃ for 72 hours after cold rolling to 10% reduction in thickness.Such boundaries are not distributed in a network of general high angle boundaries(HABs) and the GBCD is not optimized.However,for annealing at 270℃ for 7 minutes of samples cold rolled to 30%,apart from ∑3 boundaries of over 65%,a fair amount of ∑9 and ∑27 coincidence site lattice boundaries were also developed.These ∑9 and ∑27 boundaries along with the large number of curved ∑3 boundaries are located in a network of HABs and the GBCD is optimized.

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What this paper is about

The grain boundary character distribution(GBCD) of a cold-rolled Pb-0.1%Ca-1.5%(Sn-0.026%)Al alloy during annealing was investigated by means of electron back scatter diffraction.The results indicate straight ∑3 coherent twin boundaries of over 60%(all values are given as a length fraction of the total boundary length) are introduced in the alloy when annealed at 220℃ for 72 hours after cold rolling to 10% reduction in thickness.Such boundaries are not distributed in a network of general high angle boundaries(HABs) and the GBCD is not optimized.However,for annealing at 270℃ for 7 minutes of samples cold rolled to 30%,apart from ∑3 boundaries of over 65%,a fair amount of ∑9 and ∑27 coincidence site lattice boundaries were also developed.These ∑9 and ∑27 boundaries along with the large number of curved ∑3 boundaries are located in a network of HABs and the GBCD is optimized.

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Available abstract

The grain boundary character distribution(GBCD) of a cold-rolled Pb-0.1%Ca-1.5%(Sn-0.026%)Al alloy during annealing was investigated by means of electron back scatter diffraction.The results indicate straight ∑3 coherent twin boundaries of over 60%(all values are given as a length fraction of the total boundary length) are introduced in the alloy when annealed at 220℃ for 72 hours after cold rolling to 10% reduction in thickness.Such boundaries are not distributed in a network of general high angle boundaries(HABs) and the GBCD is not optimized.However,for annealing at 270℃ for 7 minutes of samples cold rolled to 30%,apart from ∑3 boundaries of over 65%,a fair amount of ∑9 and ∑27 coincidence site lattice boundaries were also developed.These ∑9 and ∑27 boundaries along with the large number of curved ∑3 boundaries are located in a network of HABs and the GBCD is optimized.

Key concepts: Grain boundary, Annealing (glass), Alloy, Materials science, Metallurgy, Crystallography, Microstructure, Chemistry

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