Experimental investigation of the dependence of void nucleation and growth on initial microstructure in high-purity titanium under tension

Pitkin, Nicholas; Patterson, Brian M.; Knezevic, Marko

doi:10.1016/j.matchar.2025.115511

Experimental investigation of the dependence of void nucleation and growth on initial microstructure in high-purity titanium under tension

Journal Article · Mon Aug 25 00:00:00 EDT 2025 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2025.115511· OSTI ID:2588073

Pitkin, Nicholas ^[1]; ^[2]; Knezevic, Marko ^[1]

University of New Hampshire, Durham, NH (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

An experimental investigation of failure mechanisms in relation to the initial microstructure in high-purity titanium samples is presented. The initial microstructure of the specimens was measured in 3D using diffraction-contrast tomography (DCT). Ex-situ X-ray computed tomography (XCT) was used to visualize voids in specimens at various levels of deformation attained by interrupted tensile testing. Electron backscatter diffraction (EBSD) mapping was used to characterize the deformed microstructures per specimen. The investigation showed that the location of failures was unrelated to the formation of the first voids, but rather the nucleation and growth of cracks were from heavily deformed surface regions. The areas surrounding the failure-causing cracks had the highest propensity for void development of any area in the specimen. This facilitated crack propagation through the specimen via “linking up”. The failure of the specimens by microvoid coalescence was bolstered by “dimpled” fracture surfaces. Paint composed of gallium embedded in rubber was used to track the displacement of points along the loading direction of the specimens, to relate the location of failure to the material's initial microstructure. However, the correlation proved difficult, due to complex microstructural evolution involving voids, grain fragmentations, and profuse twinning. Nevertheless, it was shown that necking occurred near the largest grain in the gauge section of the specimens. This is likely caused by the decrease in strength of larger grains, causing strain to concentrate in their vicinity. Here, a comprehensive picture of the failure processes in high-purity titanium under axial loading is presented and discussed in the paper.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: DEVCOM Army Research Laboratory; Los Alamos National Laboratory; USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2588073

Report Number(s):: LA-UR--25-21882; 10.1016/j.matchar.2025.115511

Journal Information:: Materials Characterization, Journal Name: Materials Characterization Journal Issue: Part A Vol. 229; ISSN 1044-5803

Publisher:: Elsevier BVCopyright Statement

Country of Publication:: United States

Language:: English

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Effect of Grain Orientation on Microstructure and Mechanical Properties of FeCoCrNi High-Entropy Alloy Produced via Laser Melting Deposition Ge, Fuyu; Liu, Shuai; Zhang, Xin Materials, Vol. 16, Issue 17 https://doi.org/10.3390/ma16175963	journal	August 2023
Evolution of the Second-Phase Particles and Their Effect on Tensile Fracture Behavior of 2219 Al-xCu Alloys Xu, Daofen; Chen, Kanghua; Chen, Yunqiang Metals, Vol. 10, Issue 2 https://doi.org/10.3390/met10020197	journal	January 2020
A Review of Damage, Void Evolution, and Fatigue Life Prediction Models Lee, Hsiao Wei; Basaran, Cemal Metals, Vol. 11, Issue 4 https://doi.org/10.3390/met11040609	journal	April 2021

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