The effects of Fe and Al on the phase transformations and mechanical behavior of -Ti β alloy Ti-11at.%Cr
The effects of Fe and Al on the phase transformations and mechanical behavior of -Ti β alloy Ti-11at.%Cr
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DOI：
10.1016/j.msea.2023.145677
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发表时间：
2023-09-21
期刊：
影响因子：
6.4
通讯作者：
Boehlert，C. J.
中科院分区：
文献类型：
--
作者：
Ballor，J.;Shawon，A. A.;Boehlert，C. J.
合金成分对于在热机械加工期间在β-钛（β-Ti）合金中形成期望的微观结构是重要的。在本工作中，相对低成本的合金元素铁（Fe）和铝（Al）被添加到基础Ti-11at. %铬（Cr）合金的拉伸过程中的显微组织演变和力学性能的原位和非原位检测，硬度，高温X射线衍射（XRD）和共振超声光谱（罗斯）进行。400 ° C XRD显示Ti-11at. % Cr经历了β → ω和β → α的转变。添加0.85原子% Fe降低了合金中ω相和α相的体积分数，添加5.3at Al抑制β-向-ω的转化。400 ° C的罗斯表明，含有ω相的合金表现出的剪切模量增加了10.140%，而不含ω相的合金表现出的剪切模量仅增加了10.102%。当ω/α比大于0.25时，含ω相的Ti-11Cr和Ti-11Cr-0.85Fe的硬度和强度值随ω相体积分数的增加而增加。讨论了ω/α体积分数比与力学性能的关系。
Alloy composition is important for developing desired microstructures in beta-titanium (β-Ti) alloys during thermomechanical processing. In this work, the relatively low-cost alloying elements iron (Fe) and aluminum (Al) were added to a base Ti-11at.%chromium (Cr) alloy and in-situ and ex-situ examination of the microstructural evolution and mechanical properties during tension, hardness, elevated temperature X-ray diffraction (XRD) and resonance ultrasound spectroscopy (RUS) were performed. The 400 °C XRD revealed that Ti-11at.%Cr underwent β-to-ω and β-to-α transformations. Adding 0.85 at.% Fe reduced the volume fraction of the ω- and α-phases, and adding 5.3 at.% Al inhibited the β-to-ω transformation. The 400 °C RUS showed that the alloys containing the ω phase exhibited an increase in shear modulus of ∼140%, while the ω-free alloys exhibited an increase of only ∼102%. The hardness and strength values of the ω-containing Ti–11Cr and Ti–11Cr-0.85Fe increased with increased ω-phase volume fraction when the ω/α ratio was greater than 0.25. The relationship between ω/α volume fraction ratio and mechanical properties is discussed.