Micrographic Digital Image Correlation Coupled with Microlithography: Case Study of Strain Localization and Subsequent Cracking at an FIB Notch Tip in a Laminated Ti-6Al-4V Alloy.
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| Title: | Micrographic Digital Image Correlation Coupled with Microlithography: Case Study of Strain Localization and Subsequent Cracking at an FIB Notch Tip in a Laminated Ti-6Al-4V Alloy. |
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| Authors: | Koyama, M.1 koyama@mech.kyushu-u.ac.jp, Tanaka, Y.2, Tsuzaki, K.1 |
| Source: | Experimental Mechanics. Feb2018, Vol. 58 Issue 2, p381-386. 6p. |
| Subjects: | Titanium-aluminum-vanadium alloys, Micrographics, Laminated materials, Mechanical properties of metals, Microlithography, Strains & stresses (Mechanics) |
| Abstract: | This study presents a microlithography-based approach to increase the spatial resolution of strain mapping by micrographic digital image correlation. A micro-mesh with a lattice size of 500 nm was added on the surface of a Ti-6Al-4V alloy specimen with a coarse lath size of 1.1 μm. Although the micro-mesh pattern was not random, a combination of the laminated microstructure and the micro-mesh enabled sub-micrometer strain mapping through digital image correlation even for coarse lath larger than 1 μm. Specifically, the strain mapping technique used in this study was applied to characterize the strain component and distribution near an artificial sharp micro-stress concentration site introduced by a focused ion beam. The strain characterization under tensile deformation clarified that cracking occurred via shear strain localization at the micro-stress concentration site, indicating that accumulation of damage (such as vacancy or dislocation) plays an important role in the cracking mechanism of the Ti-6Al-4V alloy. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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