变形量对TA15钛合金组成相形态和性能的影响

Effect of deformation degree on the morphology and mechanical property of constituent phases in TA15 titanium alloy

采用等温压缩实验研究变形量对TA15钛合金中初生α相和转变β基体形态的影响,并通过纳米压痕实验分析变形量对初生α相和转变β基体微观硬度的影响。结果表明,在大变形量条件下,初生α相明显球化,且沿垂直于压缩方向排列;不同变形量下二次α相均匀分布于转变β基体中;三次α相的出现取决于加热流程,与变形量无关。初生α相的硬度不受变形量影响,转变β基体的硬度随着变形量的增加而增加。

Isothermal compression experiments were carried out to investigate the morphology of primary αphase and transformedβmatrix at different deformation degrees . Nano indentation test was used to analyze the variation of the hardness of primary αphase and transformed βmatrix with deformation degrees . The results show that the spheroidization of the primary αphase is in-tensified and the primary αelongates in the plane perpendicular to the compression axis at large deformation degree . Secondary αphase regularly and finely distributes in the transformed βmatrix , and tertiary αphase exists in the retained βphase at different deformation degrees . The deformation degree has no effect on the hardness of primary α. The hardness of transformed βmatrix increases with the increase of deformation degree .