The dynamic responses of lamellar and equiaxed near β-Ti alloys subjected to multi-pass cross rolling
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第8期
论文作者：Wei Chen HANDe Wang Y.C.Lin Xiaoyong Zhang Chao Chen Yaping Lv Kechao Zhou
文章页码：220 - 229
摘 要：This work gives a comparison on the microstructural characteristics, textural discrepancies, and twinning behaviors of lamellar and equiaxed near β-Ti alloys during multi-pass cross rolling with a rolling reduction of 20%, 50% and 80%. The results showed that the restoration mechanism of the alloy in β phase is strongly dependent on the α morphologies, and in comparison, strain path has weaker influences on the grain refinement of the β matrix. Therefore, the texture intensities of both α and β phases were weakened owing to the dynamic recrystallization（DRX） of the two phases in the equiaxed microstructure. While,with regard to the lamellar microstructure, dynamic recovery（DRV） of the β phase predominated, forming elongated β subgrains. Besides, the α and β matrix in lamellar microstructures obeyed the Burgers orientation relationship, which was gradually broken down until the final reduction. Lastly, the{1101} twinning exhibits a strong size effect. With the continuous DRX of α phases, the α -twinning is suppressed owing to progressive grain refinement. The activation of β-twinning, namely{332} ?113?and {112} ?111?, in near β-Ti alloys is heavily dependent on the deficient β-stabilizing elements and the local stress concentration. These findings provide an effective way to obtain ultra-fine grain microstructures of this alloy.
Wei Chen1，HANDe Wang1，Y.C.Lin2，Xiaoyong Zhang1，Chao Chen1，Yaping Lv1，Kechao Zhou1
1. State Key Laboratory of Powder Metallurgy,Central South University2. School of Mechanical and Electrical Engineering,Central South University
摘 要：This work gives a comparison on the microstructural characteristics, textural discrepancies, and twinning behaviors of lamellar and equiaxed near β-Ti alloys during multi-pass cross rolling with a rolling reduction of 20%, 50% and 80%. The results showed that the restoration mechanism of the alloy in β phase is strongly dependent on the α morphologies, and in comparison, strain path has weaker influences on the grain refinement of the β matrix. Therefore, the texture intensities of both α and β phases were weakened owing to the dynamic recrystallization（DRX） of the two phases in the equiaxed microstructure. While,with regard to the lamellar microstructure, dynamic recovery（DRV） of the β phase predominated, forming elongated β subgrains. Besides, the α and β matrix in lamellar microstructures obeyed the Burgers orientation relationship, which was gradually broken down until the final reduction. Lastly, the{1101} twinning exhibits a strong size effect. With the continuous DRX of α phases, the α -twinning is suppressed owing to progressive grain refinement. The activation of β-twinning, namely{332} ?113?and {112} ?111?, in near β-Ti alloys is heavily dependent on the deficient β-stabilizing elements and the local stress concentration. These findings provide an effective way to obtain ultra-fine grain microstructures of this alloy.
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