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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第4期    总第296期    2019年4月

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文章编号:1672-7207(2019)04-0806-08
退火温度对纯钛TA1织构及各向异性的影响
张贵华,江海涛,吴波,杨永刚,田世伟,郭文启

(北京科技大学 工程技术研究院,北京,100083)

摘 要: 通过X线衍射(XRD)和电子背散射衍射(EBSD)等分析技术,研究退火温度对冷轧态TA1钛板显微组织及织构的影响规律。研究结果表明:TA1钛板冷轧退火后,微观组织发生再结晶并形成典型的双峰分裂基面织构特征。在退火温度不大于700 ℃时,组织变化主要以回复与再结晶的形核生长为主,生成 和 类型再结晶织构组分,此时轧制织构组分逐渐消失;当退火温度达到800 ℃时,晶粒变化以合并长大为主,再结晶织构组分 和 的强度也继续增强。同时,织构组分对板材的各向异性有着直接影响,由于棱锥型织构 和 再结晶织构组分特征的作用,可开动的滑移系统分别为易激活的柱面<a>滑移和较难开动的基面<a>滑移或棱锥面<c+a>滑移,从而导致板面内TD方向的拉伸强度比RD方向的拉伸强度大,而45°方向强度最低,从而产生较大的板面各向异性。

 

关键字: TA1钛板;织构;退火;再结晶;各向异性;电子背散射衍射(EBSD)

Effect of annealing temperature on texture and anisotropy of mechanical properties of pure titanium(TA1) sheet
ZHANG Guihua, JIANG Haitao, WU Bo, YANG Yonggang, TIAN Shiwei, GUO Wenqi

Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China

Abstract:The effect of evolution of microstructure and texture of commercially pure titanium (TA1) annealed at different temperatures was investigated by X-ray diffraction (XRD), and electron backscattered diffraction (EBSD). The results show that recovery and recrystallization of the cold rolled TA1 titanium sheet occur during the annealing process, and typical TD-split basal texture was formed. When the annealing temperature is below 700 ℃, the microstructure is characterized by recovery and recrystallization, and recrystallization texture components are presented. The as-rolled texture component is gradually weakened and disappears with the increase of the heat treatment temperature. When the annealing temperature reaches 800 ℃, the grain growth is dominated by merged-growth and the intensity of and recrystallized texture component continue to increase. In addition, anisotropy of mechanical properties of TA1 sheet is related to the texture components. Due to pyramid textures and recrystallization textures, the cylinder <a> slip is respectively easier to be activated and the base <a> slip or pyramidal plane <c+a> slip becomes more difficult to be activated respectively, which leads to greater tensile strength in the TD direction than the RD direction of the sheet. As a result, the anisotropy of mechanical properties of TA1 sheet is caused.

 

Key words: TA1 titanium sheet; texture; annealing; recrystallization; anisotropy; electron backscattered diffraction (EBSD)

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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