应力诱导马氏体相变对亚稳β钛合金压缩变形过程中变形行为和组织演变的影响

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Penglai Jia, Xueli Wang, Fuguo Li, Zhimin Zhang, Qiang Wang
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引用次数: 0

摘要

为了研究应力诱导马氏体相变(SIMT)对亚稳β钛合金变形行为和组织演变的影响,对经β固溶处理的Ti-10 V-2Fe-3Al (Ti-1023)合金进行了室温压缩,并对其变形行为进行了分析。利用光学显微镜(OM)和电子背散射衍射(EBSD)研究了合金在不同应变下的组织演变。结果表明:在压缩变形过程中,Ti-1023合金的应力-应变曲线和应变硬化率曲线呈现出不同的变形机制,SIMT逐渐激活(ε < 5%);随着应变的增加,SIMT和变形诱导马氏体孪晶(DIMT)逐渐激活,α″-马氏体的含量和形貌发生了显著变化,α″-马氏体不断切分成更小的晶粒尺寸(~ 6 μm),从而产生晶粒细化强化效果。同时,β-矩阵与α″-变体之间存在特定的取向关系(SORs),其中<;100 > β // <100 > α″,< 110 > β // <010 > α″,< 110 > β // <001 > α″。核平均位错(KAM)和几何必要位错(GNDs)的平均值显著增加,表明高体积分数α″-马氏体连续活化的SIMT和DIMT会导致更高的位错密度。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。

Role of Stress-Induced Martensite Transformation on Deformation Behavior and Microstructural Evolution in Metastable β Titanium Alloys during Compressive Deformation

Role of Stress-Induced Martensite Transformation on Deformation Behavior and Microstructural Evolution in Metastable β Titanium Alloys during Compressive Deformation

In this paper, in order to investigate the effect of stress-induced martensitic transformation (SIMT) on the deformation behavior and microstructure evolution of metastable β titanium alloy, the β solution treated Ti-10 V-2Fe-3Al (Ti-1023) alloy was compressed at room temperature and its deformation behavior was analyzed. Optical microscopy (OM) and electron backscatter diffraction (EBSD) were used to study the microstructure evolution of alloys at different strain. The results show that the various deformation mechanisms have been presented in the stress-strain curve and strain hardening rate curve of the Ti-1023 alloy different during the compression deformation, respectively, and the SIMT gradually activated (ε < 5%). There are significant changes in the content and morphology of α″-martensite due to the SIMT and deformation induced martensitic twinning (DIMT) gradually activated with the strain increasing, which the α″-martensite segmented continuously into smaller grain sizes (~ 6 μm) leading to grain refinement strengthening effect. Simultaneously, there is specific orientation relationships (SORs) between β-matrix and α″-variants with < 100 > β // <100 > α″, < 110 > β // <010 > α″, and < 110 > β // <001 > α″. Moreover, the average values of kernel average misorientation (KAM) and geometrically necessary dislocations (GNDs) significantly increased, indicating that the SIMT and DIMT activated continuously with a high volume fraction of α″-martensite would lead to higher dislocation density.

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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