The results of original research into the structure and statistical distribution of elements alloyed into ingots from a new Russian intermetallic TiAl alloy having two variable compositions (Ti–44.5Al–2V–1Nb–1.5Zr/2.5Cr–0.1Gd, at.%) are presented. The experimental ingots having a nominal weight of 3–30 kg were obtained according to two technological schemes: 1 — triple vacuum arc remelting (VAR + VAR + VAR) with a consumable compacted electrode; 2 — VAR → VAR → single vacuum induction melting (VAR + VAR + VIM) in a cold crucible furnace. The statistical processing of the chemical analysis results was carried out using Shewhart charts. The results indicate a minimum degree of volumetric macrosegregation in the ingots and the almost complete absence of segregation inhomogeneity in Zr- and Cr-containing compositions: the maximum range of Al content over the cross section of triple-remelted ingots was no more than 0.84 at.% (0.42 wt.%), while along the height of the ingots, Al content was no more than 1.87 at.% (0.55 wt.%).

中文翻译：

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不同成分β固化TiAl合金的化学不均匀性研究

对具有两种可变成分的新型俄罗斯金属间 TiAl 合金（Ti–44.5Al–2V–1Nb–1.5Zr/2.5Cr–0.1Gd，at.%）合金化成锭的元素的结构和统计分布的原始研究结果被提出。根据两种技术方案获得标称重量为 3-30 kg 的实验锭： 1 — 三重真空电弧重熔 (VAR + VAR + VAR) 使用自耗压紧电极；2 — VAR → VAR → 冷坩埚炉中的单真空感应熔炼（VAR + VAR + VIM）。使用休哈特图表对化学分析结果进行统计处理。结果表明，锭中的体积宏观偏析程度最低，并且在含 Zr 和 Cr 的组合物中几乎完全没有偏析不均匀性：