【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■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■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。更多还原

【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■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.更多还原