The Ti-3.3Al-2.8Mo-1.2V alloy is commonly utilized in high-pressure marine vessels. This study investigated its constitutive behavior through compression tests conducted at temperatures ranging from 850 °C to 1100 °C and strain rates between 0.001 and 10 s−1. Subsequently, the microstructural evolution was analyzed. In the α + β phase region, higher temperatures enhanced the spheroidization of α grains, while increased strain rates suppressed it. Additionally, the c-axes of α-phase grains were observed to rotate toward a direction perpendicular to the compression direction (CD), with the rotation becoming more pronounced at higher strain rates. In contrast, the β-phase region displayed scattered {0001} poles in the pole figure (PF), indicating a lack of distinct texture. However, as the strain rate increased, the c-axes of grains gradually aligned perpendicularly to the CD, resulting in the development of a <20<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11661_2025_7872_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">$\overline{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation><InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11661_2025_7872_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">$\overline{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation>>|| CD texture. Texture formation in the α + β phase region was primarily governed by prismatic slip, whereas both prismatic and pyramidal slip systems became increasingly active in the β-phase region as strain rates rose after deformation. A constitutive model relating the flow stress of the Ti-3.3Al-2.8Mo-1.2V alloy to strain rate and temperature was proposed, achieving a correlation coefficient of 0.91 and an average absolute relative error of 8.11 pct.

Constitutive Modeling and Microstructural Evolution of Ti-3.3Al-2.8Mo-1.2V Alloy Under Hot Compression

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发表日期：

2025年7月5日

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Kai Tang,
Bobo Lu,
Gang Yang,
Yi Yang,
Mingxia Wu,
Junming Fan,
Qixiong Zhou,
Xiong Luo

摘要

The Ti-3.3Al-2.8Mo-1.2V alloy is commonly utilized in high-pressure marine vessels. This study investigated its constitutive behavior through compression tests conducted at temperatures ranging from 850 °C to 1100 °C and strain rates between 0.001 and 10 s⁻¹. Subsequently, the microstructural evolution was analyzed. In the α + β phase region, higher temperatures enhanced the spheroidization of α grains, while increased strain rates suppressed it. Additionally, the c-axes of α-phase grains were observed to rotate toward a direction perpendicular to the compression direction (CD), with the rotation becoming more pronounced at higher strain rates. In contrast, the β-phase region displayed scattered {0001} poles in the pole figure (PF), indicating a lack of distinct texture. However, as the strain rate increased, the c-axes of grains gradually aligned perpendicularly to the CD, resulting in the development of a <20 $\overline{1}$ $\bar{1}$ $\overline{1}$ $\bar{1}$ >|| CD texture. Texture formation in the α + β phase region was primarily governed by prismatic slip, whereas both prismatic and pyramidal slip systems became increasingly active in the β-phase region as strain rates rose after deformation. A constitutive model relating the flow stress of the Ti-3.3Al-2.8Mo-1.2V alloy to strain rate and temperature was proposed, achieving a correlation coefficient of 0.91 and an average absolute relative error of 8.11 pct.