为提升 Ti-6Al-4V 合金铸锭成分均匀性，解决铸锭底部出现的 Al 元素贫化问题，系统研究了不同混料质量(100、150、200 kg)与混料次数(一次混料与两次混料)对电极块合金分布及铸锭成分均匀性的影响规律。 结果表明，随着混料质量增加，钒铝合金(V-Al)和铝豆(Al)在电极块中下部的沉积程度加剧，导致电极块内部出现宏观偏析。 一次混料方式下，电极块上半部形成尺度较大的合金贫化区，该不均匀性在后续熔炼过程中无法被完全消除，最终遗传至铸锭底部，形成贫 Al 区。 相比之下，两次混料方式通过分批次投料，有效打散了宏观偏析的尺度，使其处于熔炼过程自均匀化能力的容错范围内，从而显著提升了铸锭整体成分均匀性。

To increase the compositional uniformity of Ti-6Al-4V alloy ingots and address the issue of aluminium (Al) depletion occurring at the bottom of the ingot, the influences of different mixing weights (100, 150, and 200 kg) and mixing cycles (single mixing and double mixing) during electrode block preparation on the alloy distribution in electrode

blocks and the compositional uniformity of the final ingots were systematically investigated. The results show that with increasing mixing weight, the degree of vanadium-aluminium (V-Al) alloy deposition and the number of Al nodules in the middle and lower parts of the electrode block intensify, leading to macroscopic segregation inside the electrode block. Under the single mixing method, a large-scale alloy-depleted zone is formed in the upper part of the electrode block; this inhomogeneity cannot be completely eliminated in the subsequent melting process and is ultimately inherited by the ingot bottom, resulting in an Al-depleted region. In contrast, the double mixing method, through batch feeding, effectively breaks up the scale of macroscopic segregation and confines it within the tolerance range of self-homogenization capability duringthe melting process. Consequently, the overall compositional uniformity of the ingot is significantly improved.