GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF Pb-Ca-Sn-Al ALLOY OF SOLUTION-TREATED AND PRE-AGED FOLLOWED BY STRAIN ANNEALING

Acta Metall Sin

2007, Vol. 43

Issue (5): 454-458 DOI:

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GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF Pb-Ca-Sn-Al ALLOY OF SOLUTION-TREATED AND PRE-AGED FOLLOWED BY STRAIN ANNEALING

山东理工大学机械工程学院金属材料系

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. GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF Pb-Ca-Sn-Al ALLOY OF SOLUTION-TREATED AND PRE-AGED FOLLOWED BY STRAIN ANNEALING. Acta Metall Sin, 2007, 43(5): 454-458 .

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Abstract The grain boundary character distributions (GBCD) of Pb-0.05%Ca-1.5%Sn-0.026%Al （mass fraction）alloy, which was solution treated at 290℃ and solution treated followed by pre-ageing at 100℃～200℃ prior to the same strain annealing, were investigated by means of electron back scatter diffraction ( EBSD) techniques. The results indicate that special boundaries were largely populated in the specimen which was strain annealed just after solution treatment. The fractions of ∑3 and（∑9+∑27）boundaries reached 49.6% and 7.2%, respectively, and the connectivity of general high angle boundaries (HABs) network was interrupted substantially by the special boundaries. However, special boundaries of fairly low fraction were developed in the specimen which was strain annealed after solution treatment and pre-ageing. The fractions of ∑3 and（∑9+∑27）boundaries was less than 35.9% and 2.5%, respectively, and the connectivity of general high angle boundaries (HABs) network was not interrupted significantly.

Key words: Pb alloy grain boundary character distribution (GBCD) cold rolling and annealing

Received: 31 August 2006

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