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Impact of grain orientation and phase on Volta potential differences in an additively manufactured titanium alloy. | LitMetric

AI Article Synopsis

  • This study presents a new method for combining different imaging techniques to analyze sub-micrometer features in titanium alloy components created through additive manufacturing, specifically Ti-6Al-4V.
  • The research involved treating these components via hot isostatic pressing and then using advanced microscopy techniques to evaluate how various structural factors affect the electrical properties between different titanium phases.
  • The findings highlight that controlling the crystallographic texture and phase distribution can help prevent micro-galvanic corrosion in these titanium parts by reducing specific grain interactions.

Article Abstract

This work introduces a method for co-localized multi-modal imaging of sub-m features in an additively manufactured (AM) titanium alloy. Ti-6Al-4V parts manufactured by electron beam melting powder bed fusion were subjected to hot isostatic pressing to seal internal porosity and machined to remove contour-hatch interfaces. Electron microscopy and atomic force microscopy-based techniques (electron backscatter diffraction and scanning Kelvin probe force microscopy) were used to measure and categorize the effects of crystallographic texture, misorientation, and phase content on the relative differences in the Volta potential of -Ti and -Ti phases. Given the tunability of additive manufacturing processes, recommendations for texture and phase control are discussed. In particular, our findings indicate that the potential for micro-galvanic corrosion initiation can be regulated in AM Ti-6Al-4V parts by minimizing both the total area of {111} prior-β grains and the number of contact points between {111} β grains and laths that originate from {001} prior-β grains.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8272250PMC
http://dx.doi.org/10.1063/5.0038114DOI Listing

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