退火温度对Ti-22Al-25Nb合金板组织与各向异性的影响

doi:10.13251/j.issn.0254-6051.2025.11.038

摘要/Abstract

摘要： 通过扫描电镜(SEM)、电子背散射衍射(EBSD)及拉伸性能测试,研究了退火温度(930、950和970 ℃)对Ti-22Al-25Nb合金板材组织及各向异性的影响。结果表明,随退火温度升高,O相逐渐溶解,B2相基体的演变机制从回复转变为部分再结晶,在970 ℃时发生完全再结晶,晶粒尺寸显著增大至100 μm以上。织构分析表明,低温退火后合金以{100}<011>织构为主,而高温退火后则转变为以{112}<110>织构为主导。施密特因子分析结果表明,退火温度升高加剧了横向与轧向施密特因子的差异,从而导致横向位错滑移的启动应力增大。经970 ℃退火后,横向屈服强度相较轧向高出73 MPa。

关键词: Ti-22Al-25Nb合金, 退火温度, 显微组织, 织构, 各向异性

Abstract: Effect of annealing temperature (930, 950, and 970 ℃) on microstructure and anisotropy of Ti-22Al-25Nb alloy sheet was studied by means of scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and tensile tests. The results indicate that as the annealing temperature increases, the O phase gradually dissolves, the evolution mechanism of B2 phase matrix changes from recovery to partial recrystallization, complete recrystallization occurs at 970 ℃, and the grain size significantly increases to more than 100 μm. Orientation distribution function(ODF) texture analysis indicates that the alloy is dominated by the {100}<011> texture after low-temperature annealing, while it is dominated by the {112}<110> texture after high-temperature annealing. Schmidt factor analysis shows that the increase of annealing temperature exacerbates the difference in Schmidt factor between the transverse direction(TD) and the rolling direction(RD), thereby increasing the initiation stress for transverse dislocation slip. After annealing at 970 ℃, the yield strength in the transverse direction is 73 MPa higher than that in the rolling direction.

Key words: Ti-22Al-25Nb alloy, annealing temperature, microstructure, crystallographic texture, anisotropy

中图分类号:

TG146.23

韩潮雨, 张建伟, 顾新福, 赵洪泽, 马雄, 梁晓波. 退火温度对Ti-22Al-25Nb合金板组织与各向异性的影响[J]. 金属热处理, 2025, 50(11): 272-278.

Han Chaoyu, Zhang Jianwei, Gu Xinfu, Zhao Hongze, Ma Xiong, Liang Xiaobo. Effect of annealing temperature on microstructure and anisotropy of Ti-22Al-25Nb alloy sheet[J]. Heat Treatment of Metals, 2025, 50(11): 272-278.

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