科研之友
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摘要
The grain boundary character distribution of TLM titanium alloy (with a nominal chemical composition of Ti-3Zr-2Sn-3Mo-25Nb) was studied under the deformation condition with different strain rates and compression reductions. The experimental results showed that the evolution and character distribution of grain boundaries structure during deformation were both related to grain boundary coupling, sliding, migration, and the grain rotating in nature. In TLM titanium alloy, the type of grain boundaries under different deformation condition included high-angle boundaries, low-angle boundaries, and the CSL boundaries of I 3 pound, I 13 pound, I 29 pound, and I 39 pound. Under the strain rate of 1 s(-1), the numbers of grain boundaries with misorientation angle of 3A degrees, 30A degrees, and 60A degrees all decreased obviously with the increasing compression reduction to 4.5%, comparing to those obtained under the strain rate of 0.001 s(-1). Under the strain rate of 1 s(-1), the numbers of I 29 pound boundaries greatly increased with the compression reductions of 3 to 4.5% comparing to those obtained under the strain rate of 0.001 s(-1), and the numbers of I 3 pound boundaries increased firstly and then stabilized with the compression reduction increasing from 0 to 4%, while the numbers of I 39 pound boundaries decreased with the compression reduction increasing to 4.5%.
