Crack nucleation and growth in α/β titanium alloy with lamellar microstructure under uniaxial tension: 3D X-ray tomography analysis

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:747

Article

Dang, Ning^1,2  Liu, Lingyu³  Adrien, Jerome²  Cazottes, Sophie²  Xiao, Wenlong¹  Ma, Chaoli¹  Zhou, Lian⁴  Maire, Eric² 

[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China

[2] Univ Lyon, INSA Lyon, MATEIS CNRS UMR 5510, F-69621 Villeurbanne, France

[3] Baoti Grp Co Ltd, Baoji 721014, Peoples R China

[4] Northwest Inst Nonferrous Met Res, Xian 710016, Shaanxi, Peoples R China

关键词: Ti-6Al-4V alloy;    X-ray tomography;    In situ tensile test;    Void propagation;    Bypassing behavior;   

DOI  :  10.1016/j.msea.2019.01.065

来源: Elsevier

【 摘 要 】

In situ tensile tests were carried out on notch axisymmetric samples of as-cast (alpha+beta) Ti alloy to analyze evolution of void/micro-crack with the help of X-ray Synchrotron tomography. The results indicate that junctions or boundaries of a colonies could be the most vulnerable sites for voids nucleation. In addition, during the growth and coalescence procedure, ligaments could be observed on the voids/micro-crack. A bypassing & fracture propagating approach was proposed and validated to interpret the existence of ligaments. In the propagating procedure, due to lacking of hard precipitations, microstructure zone and other inserting colony could play a role as hard obstacle in the growing path. This could induce a bypassing & fracture propagating approach for void coalescence and micro-crack growth.

【 授权许可】

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