Damage behavior of micro segregation in Al-Si alloy by use of phase contrast imaging

Ryusuke Yamada, Hiroyuki Toda, Yasuko Besel, Kentaro Uesugi, Takeuchi Akihisa

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Some segregation in casting alloys are microstructural defects and degrade mechanical properties of the alloys. Therefore it is important to understand the influence of the distribution of segregation regions on fracture behavior. In this study, tensile test was carried out on an Al-Si cast alloy. Three-dimensional (3D) in-situ observation of its tensile fracture behavior was performed by means of the synchrotron X-ray computed tomography (CT) technique. Some segregation regions have similar density to that of the matrix. Phase retrieval processing, which is one of the phase contrast imaging techniques, enables us to distinguish such segregations based on X-ray CT tomographic images. Fracture path was identified by comparing unfractured and fractured 3D volumes. Grey values of each voxel in CT images correlate to the density of the material after the phase retrieval processing. Examining grey values of voxels on the extracted fracture path, it was found that fracture occurred preferably around the segregation part with high density.

Original languageEnglish
Title of host publication72nd World Foundry Congress, WFC 2016
PublisherThe WFO (The World Foundry Organization Ltd)
Number of pages2
ISBN (Electronic)9781510833128
Publication statusPublished - 2016
Event72nd World Foundry Congress, WFC 2016 - Nagoya, Japan
Duration: May 21 2016May 25 2016

Publication series

Name72nd World Foundry Congress, WFC 2016


Other72nd World Foundry Congress, WFC 2016

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Metals and Alloys


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