Abstract

The possibility of producing high-quality ingots of an advanced biomedical Ti–20 at % Nb–5 at % Ta alloy by melting in an argon arc furnace and subsequent homogenizing annealing is demonstrated. The microhardness, phase composition, and structure of the ingots are studied. After melting, the structure of the alloy is shown to be partially dendritic; it forms as a result of the temperature gradient induced by cooling of an ingot in a copper mold and consists of β-Ti with traces of α'-phase precipitates. Annealing of the alloy at 900°C leads to the destruction of the dendritic structure, leveling the chemical composition, and recrystallization. Upon annealing at 950°C, further grain growth and the appearance of an insignificant amount of the ω phase are observed.

中文翻译：

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在氩弧炉中生产 Ti-20 at % Nb-5 at % Ta 合金

摘要

证明了通过在氩弧炉中熔化和随后的均质化退火来生产高质量的生物医学 Ti-20 at % Nb-5 at % Ta 合金锭的可能性。研究了铸锭的显微硬度、相组成和结构。熔化后，合金的结构显示为部分树枝状；它是由铜模具中的铸锭冷却引起的温度梯度形成的，由带有痕量 α' 相析出物的 β-Ti 组成。合金在 900°C 的退火导致枝晶结构的破坏、化学成分的均匀化和再结晶。在 950°C 退火后，观察到进一步的晶粒生长和少量 ω 相的出现。