Nucleation and Growth Analysis of {10–12} Tensile Twin in TA2 Alloy by In-Situ Tensile Test

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-01-25 DOI:10.1007/s12540-025-01893-z

Pengyu Wang, Ziqi Wei, Pingli Mao, Le Zhou, Zhi Wang, Feng Wang, Xuanyu Liu, Zheng Liu

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Abstract

The nucleation and growth of {10–12} tensile twins in TA2 pure titanium during in-situ tensile test are explored by electron backscattered diffraction (EBSD). The dynamic process of twin growth can be clearly revealed by observe the evolution of microstructure at the same position with cumulative strains increases. According to the statistics and analysis of experimental data, it is found that the Schmid factor (SF) plays an important role during the nucleation and growth of twins. The twin variants with high SF are easy to be activated. However, approximately 18% of twins not satisfy the SF law, have low SF, nucleation and growth occur during deformation. In addition, the strain compatibility between tensile twins and various deformation modes in adjacent grains are analyzed by geometric compatibility factor. For tensile twin nucleation and growth, the shear strain generated by various deformation modes in adjacent grains plays an important role. The shear strain generated by tensile twins and pyramidal slip are beneficial to the twin nucleation, however, pyramidal slip is not conducive to the twin growth.

Graphical Abstract

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原位拉伸试验分析TA2合金中{10-12}拉伸孪晶的形核与长大

利用电子背散射衍射（EBSD）研究了TA2纯钛在原位拉伸试验中{10-12}拉伸孪晶的形核和生长。通过观察同一位置随累积应变增加的微观组织演变，可以清楚地揭示孪晶生长的动态过程。通过对实验数据的统计和分析，发现施密德因子（SF）在双胞胎成核和生长过程中起着重要作用。具有高SF的双变体很容易被激活。然而，约18%的孪晶不满足SF定律，具有低SF，变形过程中出现形核和长大。此外，利用几何相容因子分析了拉伸孪晶与相邻晶粒中不同变形模式之间的应变相容性。对于拉伸孪晶的形核和生长，相邻晶粒中各种变形模式产生的剪切应变起着重要作用。拉伸孪晶和锥体滑移产生的剪切应变有利于孪晶成核，锥体滑移不利于孪晶长大。图形抽象

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来源期刊

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.