Ti-3Al-5Mo-4Cr-2Zr-1Fe合金在α+β相区不同道次热变形过程中β晶粒细化和动态再结晶

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Bohan Zhang, Yang Liang, Wenzhe Zhang, Xinyu Xu, Feng Li, Hui Chang
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引用次数: 0

摘要

本文系统地研究了α+β区应变速率为0.01 s⁻1的近β合金Ti-3Al-5Mo-4Cr-2Zr-1Fe在单道次和多道次变形过程中的组织演变和流变软化行为。结果表明:在单道压缩过程中,温度升高导致流动应力降低,α相破碎,α向β动态相变;在多道次热压缩过程中,随着应变的增加,大量α相发生球化。β相在与压缩轴正交的方向上拉长,平均晶粒尺寸减小。β晶粒的取向由随机分布转变为沿平行于压缩轴的<;111>;和<;001>;方向排列。随着道次的增加,β晶粒的尺寸由单道次变形后的30.35 μm细化到三道次变形后的18.62 μm。等轴α相尺寸显著增大,变形组织中几何必需位错密度相应增大。位错在晶界和亚晶界处逐渐积累,局部内应力成为成核的驱动力,促进动态再结晶,从而提高再结晶的程度。单道次热压缩软化机制主要为连续动态再结晶(CDRX),而三道次热压缩软化机制主要为连续动态再结晶和间断动态再结晶并存。变形织构{001}和{111}的强度随道次次数的增加而减小,与再结晶程度呈负相关。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Refinement of β Grains and Dynamic Recrystallization of Ti–3Al–5Mo–4Cr–2Zr–1Fe Alloy during Different Passes Hot Deformation in α+β Phase Region

This study systematically investigates the microstructural evolution and flow softening behavior of the near-β alloy Ti–3Al–5Mo–4Cr–2Zr–1Fe under strain rate of 0.01 s⁻1 in the α+β phase region, during both single-pass and multi-pass deformation. The results show that an increase in temperature led to a reduction in flow stress, fragmentation of the α phase, and dynamic phase transformation from α to β during single-pass compression. During multi-pass hot compression, as the strain increased, a substantial amount of the α phase underwent spheroidization. The β phase was elongated in the direction orthogonal to the compression axis, accompanied by a decrease in average grain size. The orientation of β grains changed from a random distribution to alignment along the <111> and <001> directions parallel to the compression axis. With an increasing number of passes, the size of β grains was refined from 30.35 μm after single-pass deformation to 18.62 μm after 3-pass. The size of the equiaxed α phase increased significantly, and the geometrically necessary dislocation density in the deformed microstructure correspondingly increased. Dislocations progressively accumulated at grain and subgrain boundaries, and the localized internal stresses acted as a driving force for nucleation, promoting dynamic recrystallization and thereby enhancing the degree of recrystallization. The main softening mechanism during single-pass hot compression was continuous dynamic recrystallization (CDRX), while both CDRX and discontinuous dynamic recrystallization coexisted during three-pass compression. The intensities of the deformation textures {001} and {111} decreased with the number of passes, showing a negative correlation with the degree of recrystallization.

Graphical Abstract

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来源期刊
Metals and Materials International
Metals and Materials International 工程技术-材料科学:综合
CiteScore
7.10
自引率
8.60%
发文量
197
审稿时长
3.7 months
期刊介绍: Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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