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Chen Wei1,Lv Yaping2,Zhang Xiaoyong1*,Chen Chao1,Zhou Kechao1
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1.State Key Laboratory of Powder Metallurgy, Central South University, Lu Mountain South Road, Hunan, Changsha 410083, PR China;2.Hunan Goldsky Titanium Industry Technology Co.,Ltd, No. 97, Qianming Road, Deshan Town, Changde ECO-TECH Development Zone, Hunan Pro., China

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    Abstract:

    Lamellar Ti–55511 near-beta Ti alloy was conducted on 750°C hot rolling and subsequent 600°C annealing to investigate the microstructure evolution and mechanical properties. The Burgers orientation relationship between α and β phase is broken down owing to dynamic recrystallization (DRX) of lamellar α phase during hot deformation, forming fine and equiaxed α plates, which leads to the increasing tensile strength and elongation. During annealing, secondary α grains are precipitated from β matrix, resulting in higher strength but lower elongation. Meanwhile, further spheroidization and growth of α phase via static recrystallization (SRX) happen during annealing. The recrystallization of β phase only happens in subsequent annealing rather than hot rolling. At the beginning of the deformation, two twin variants can be found in lamellar α phase. With an increase in deformation, three twin variants are formed in α phase. The nano-scaled twins and stacking fault was formed resulting from twins decomposing during annealing.

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[陈维,Lv Yaping, zhangxiaoyong, chenchao, zhoukechao. Chen Wei1,Lv Yaping2,Zhang Xiaoyong1*,Chen Chao1,Zhou Kechao1[J]. Rare Metal Materials and Engineering,2020,49(3):897~900.]
DOI:10.12442/j. issn.1002-185X.17Ti2019190

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History
  • Received:January 30,2019
  • Revised:July 12,2019
  • Adopted:July 30,2019
  • Online: April 08,2020
  • Published: