Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions

被引：7

作者：

Li, Lintao ^{[1
]}

Jin, Tao ^{[1
]}

Shuang, Fei ^{[2
,3
]}

Li, Zhiqiang ^{[1
]}

Wang, Zhihua ^{[1
]}

Ma, Wei ^{[1
,2
]}

机构：

[1] Taiyuan Univ Technol, Inst Applicat Mech, Taiyuan 030024, Peoples R China

[2] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China

[3] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA

来源：

MATERIALS | 2020年 / 13卷 / 24期

关键词：

titanium alloy; deformation localization; microcosmic mechanism; shear-compression specimen; dynamic combined loading; PURE TI; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; INSTABILITY; TI-6AL-4V; BEHAVIOR;

D O I：

10.3390/ma13245646

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Titanium Ti6Al4V alloy is a superior material that has extremely high strength, hardness and good anti-corrosion resistance. Dynamic shear-compression experiments were carried out on the alloy to investigate the micro-mechanisms of adiabatic shear banding (ASB) formation. The split Hopkinson pressure bar (SHPB) setup were used for the tests at high strain rates. It was found that the shear deformation localization (SDL) was considerably affected by the complex loading conditions. The micro-mechanisms for the ASB formation relied on different shear compressive proportion of loadings (SCLPs). Scanning electron microscope (SEM) observations showed that the ASB width was related with the SCLP and the fracture failure of alloy was induced by the nucleation and growth of microvoids. In transmission electron microscope (TEM) analysis, the microstructural changes of material within the ASB were characterized by dynamic recrystallization (DRX) and twining grain formation, dislocation migration, and stacking and grain refining processes. The results in this article demonstrates a complex image of microstructural evolution of alloy in the shear localization process.

引用

页码：1 / 12

页数：12

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