Experimental study and modeling of the microstructural effects on the mechanical behavior of Ti-6Al-4V titanium alloy

IF 1.9 4区工程技术 Q3 MECHANICS

Mechanics Research Communications Pub Date : 2025-07-12 DOI:10.1016/j.mechrescom.2025.104473

Fatna Benmessaoud , Mohammed Cheikh , Vanessa Vidal , Hiroaki Matsumoto , Vincent Velay

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Abstract

This work is devoted to studying the coupled effect of grain size and crystallographic texture on the mechanical behavior at room temperature of Ti6Al4V alloy with an equiaxed microstructure. To this end, experimental data was collected on a broad range of mechanical solicitation conditions through monotonic and cyclic tests, followed by macroscopic elasto-viscoplastic modeling.

The experimental results show that the mechanical behavior of Ti6Al4V is mainly influenced by both the grain size and the crystallographic texture. The microstructure with the finest grain size exhibits the highest flow stress. The weakly textured alloy presents the highest ductility. Moreover, all the Ti6Al4V microstructures present cyclic softening behavior. In addition, at room temperature, no microstructure was found to exhibit significant strain rate sensitivity. The results also show that the grain size affects the yield strength of the Ti6Al4V alloy, as well as its ductility and its kinematic hardening.

The proposed model formulation accurately predicts the effect of the microstructural features of the Ti6Al4V alloy. Isotropic and kinematic hardening laws are modified by introducing the grain size effects via the Hall-Petch relationship.

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微观组织对Ti-6Al-4V钛合金力学行为影响的实验研究与模拟

本文研究了晶粒尺寸和晶构对等轴组织Ti6Al4V合金室温力学行为的耦合影响。为此，通过单调和循环试验，在广泛的力学诱发条件下收集实验数据，然后进行宏观弹粘塑性建模。实验结果表明，Ti6Al4V的力学行为主要受晶粒尺寸和晶体织构的影响。晶粒尺寸越细的微观组织流变应力越大。弱织构合金具有最高的延展性。此外，所有Ti6Al4V组织都表现出循环软化行为。此外，在室温下，没有发现任何微观结构表现出明显的应变速率敏感性。晶粒尺寸不仅影响Ti6Al4V合金的屈服强度，还影响合金的塑性和运动硬化。提出的模型公式准确地预测了Ti6Al4V合金微观组织特征的影响。通过引入霍尔-佩奇关系的晶粒尺寸效应，修正了各向同性和运动硬化规律。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mechanics Research Communications 物理-力学

CiteScore

4.10

自引率

4.20%

发文量

114

审稿时长

9 months

期刊介绍： Mechanics Research Communications publishes, as rapidly as possible, peer-reviewed manuscripts of high standards but restricted length. It aims to provide: • a fast means of communication • an exchange of ideas among workers in mechanics • an effective method of bringing new results quickly to the public • an informal vehicle for the discussion • of ideas that may still be in the formative stages The field of Mechanics will be understood to encompass the behavior of continua, fluids, solids, particles and their mixtures. Submissions must contain a strong, novel contribution to the field of mechanics, and ideally should be focused on current issues in the field involving theoretical, experimental and/or applied research, preferably within the broad expertise encompassed by the Board of Associate Editors. Deviations from these areas should be discussed in advance with the Editor-in-Chief.