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Beta Phase Superplasticity in Titanium Alloys by Boron Modification

机译:硼改性钛合金中的β相超塑性

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Addition of boron to titanium alloys produces fine TiB whiskers in situ with excellent thermal stability and good chemical compatibility with the matrix. These whiskers stabilize a fine-grain microstructure by restricting grain growth at high temperatures in the p phase field. The hot deformation behavior in the p phase field (temperature range 1050-1200 deg C) of TI-6A1-4V alloys modified with two different levels of B additions (1.6 and 2.9 wt. percent) produced by powder metallurgy was investigated using hot compression tests in the strain rate range of 10~(-3) to 10~(-1) s~(-1) and hot tensile tests at a nominal strain rate of 6 X 10~(-4) s~(-1). The P phase exhibits superplasticity, which occurs due to stabilization of a fine-grain microstructure by the TiB. Matrix grain boundary sliding and p/TiB interface sliding appear to contribute to the p superplasticity. The ability to achieve superplasticity at higher temperatures enable lower flow stresses, improved chemical homogeneity, and high strain rate capability due to enhanced accommodation processes.
机译:在钛合金中添加硼可在原位生成细的TiB晶须,具有优异的热稳定性和与基体的良好化学相容性。这些晶须通过限制p相场中高温下的晶粒生长来稳定细晶粒的微观结构。使用热压缩技术研究了粉末冶金法对钛-6A1-4V合金通过两种不同含量的添加量(1.6和2.9重量%)改性的TI-6A1-4V合金在p相场(温度范围为1050-1200℃)中的热变形行为。在10〜(-3)到10〜(-1)s〜(-1)的应变速率范围内进行测试,并在6 X 10〜(-4)s〜(-1)的额定应变速率下进行热拉伸测试。 P相表现出超塑性,这是由于TiB稳定了细晶粒的微观结构而发生的。基质晶界滑动和p / TiB界面滑动似乎有助于p超塑性。在更高温度下实现超塑性的能力可实现更低的流动应力,改善的化学均质性以及由于改进的适应过程而具有的高应变速率能力。

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