Analysis of hybrid fracture in α/β titanium alloy with lamellar microstructure

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

卷:744

Article

Dang, Ning^1,2  Chen, Shuai³  Liu, Lingyu⁴  Maire, Eric²  Adrien, Jerome²  Cazottes, Sophie²  Xiao, Wenlong¹  Ma, Chaoli¹  Zhou, Lian^1,5 

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

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

[3] Univ Lyon, INSA Lyon, LAMCOS, CNRS,UMR 5259, F-69621 Villeurbanne, France

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

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

关键词: Crystal plasticity;    Spectral method;    Fracture behavior;    Titanium alloys;    Deformation heterogeneities;   

DOI  :  10.1016/j.msea.2018.12.007

来源: Elsevier

【 摘 要 】

An integrated experimental-numerical method combining a realistic microstructure-based isotropic crystal plasticity (CP) model and fracture surface analysis was adapted to analyze the fracture behavior of the titanium alloy Ti-6Al-4V. A hybrid fracture mode consisting of cleavage facets and elongated dimples was observed and analyzed. With the help of numerical simulations and post-mortem SEM, the micro-mechanism of the hybrid fracture mode was revealed. The results show that ruptured a lamellae can be linked to cleavage facets induced by the development of voids. Simultaneously, hard beta lath can function as walls that separate two neighboring arrays of voids or micro cracks within the a lamellae. The origin of this behavior can be associated with a heterogeneous stress/strain distribution in the alpha/beta phases, which was revealed via numerical simulations. Further, the influence of the alpha grain orientation on the void evolution was investigated by varying the Schmid factor of the grains in simulations.

【 授权许可】

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