Dynamic mechanical behavior, microstructure evolution, and restoration mechanism of a β-Ti alloy during hot compression deformation

IF 3.4 Q1 ENGINEERING, MECHANICAL 国际机械系统动力学学报(英文) Pub Date : 2022-11-03 DOI:10.1002/msd2.12056
Xi Pan, Pei Li, Yang Chen, Zhixiang Qi, Hao Xu, Yuede Cao, Yuan Lei, Gong Zheng, Guang Chen
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Abstract

Metastable β titanium alloys are promising materials for lightweight and energy-efficient applications due to their high strength and low density. Thermal–mechanical processing (TMP) is one of the most effective ways to improve the mechanical properties of such alloys. This paper describes a systematic TMP investigation on a new metastable β titanium alloy, including its dynamic mechanical behavior, and microstructure evolution, via isothermal compression tests and electron back-scattered diffraction characterizations. The results show that the compression stress increases with an increase in the strain rate and a decrease in the temperature. After yielding, the compression stress–strain pattern shows flow-softening behavior at a low temperature and a high strain rate, while sustaining a steady flow state at a high temperature and a low strain rate. The temperature-rise effect contributes to a large degree of flow softening at high strain rates. After the correction for temperature rise, the stress–strain constitutive relationships are established, showing that the compression behavior varies in different phase regions. Based on the microstructure characterizations, it is found that the dynamic recovery and dynamic recrystallization dominate the hot deformations in β phase region and at low strain rates, while the deformation band as an additional product is found in α + β phase region and at high strain rates. The results contribute to a better understanding of the TMP for the considered alloy and may also represent a useful database for β-Ti alloy applications in lightweight mechanical systems.

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热压缩变形过程中β-钛合金的动态力学行为、显微组织演变及恢复机制
亚稳态β钛合金由于其高强度和低密度的特点,在轻量化和节能应用方面具有很大的前景。热机械加工(TMP)是提高此类合金力学性能的最有效方法之一。本文通过等温压缩实验和电子背散射衍射表征,系统地研究了一种新型亚稳β钛合金的动态力学行为和微观组织演变。结果表明:压缩应力随应变速率的增大和温度的降低而增大;屈服后,压缩应力-应变模式在低温、高应变速率下表现为流动软化,在高温、低应变速率下保持稳定流动状态。在高应变速率下,温升效应导致了较大程度的流动软化。修正温升后,建立了应力-应变本构关系,表明不同相区的压缩行为不同。通过显微组织表征发现,在低应变速率下,β相区热变形以动态恢复和动态再结晶为主,而在高应变速率下,α + β相区热变形带作为附加产物存在。这些结果有助于更好地理解所考虑的合金的TMP,也可能为β-钛合金在轻量化机械系统中的应用提供有用的数据库。
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