Abstract Titanium and its alloys are extensively used in a variety of high performance applications with the α + β alloy, Ti-6Al-4V, being the most popular. Conventionally Ti alloys in the as-cast condition possess highly coarse prior β grains, whose size is in the order of ~mm. Such large grain sizes not only reduce the strength of the alloy, but also impair its workability. The addition of about 0.1% wt.% B can result marked reduction in the grain size. The advantages offered by microstructural refinements, thus induced by trace addition of B in Ti alloys, are reviewed in this paper. Processing response of the as-cast alloys improved as a result of grain refinement due to B addition, leading to the possibility of removal or minimization of primary ingot breakdown steps. This can significantly bring down the cost of the finished Ti alloy components. Microstructural refinements with B addition on the mechanical performance of the alloys both at room and elevated temperatures are reviewed with emphasis on the microstructure-property correlations.

中文翻译：

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硼改性钛合金

摘要 钛及其合金被广泛用于各种高性能应用，其中最流行的是 α + β 合金 Ti-6Al-4V。通常，铸态的 Ti 合金具有高度粗的先验 β 晶粒，其尺寸约为 ~mm。如此大的晶粒尺寸不仅降低了合金的强度，而且损害了其可加工性。添加约 0.1% wt.% B 可导致晶粒尺寸的显着减小。本文综述了钛合金中微量添加 B 所带来的显微组织细化所带来的优势。由于 B 添加导致晶粒细化，铸态合金的加工响应得到改善，从而导致去除或最小化初级铸锭分解步骤的可能性。这可以显着降低成品钛合金部件的成本。回顾了添加 B 对合金在室温和高温下的机械性能的微结构改进，重点是微结构-性能的相关性。