Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4934839
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Funding
- National Natural Science Foundation of China [51302207, 51275392, 51271140]
- National Basic Research Program of China (973 Program) [2015CB057400]
- Fundamental Research Funds for the Central Universities [2015gjhz03]
- National Young 1000 Talents Program of China
- Office of Science, Office of Basic Energy Sciences, Materials Science Division, of the U.S. Department of Energy at LBNL [DE-AC02-05CH11231]
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Synchrotron X-ray microdiffraction was employed to investigate the inhomogeneous distribution of defect and residual strain in the transitional region between the dendritic and stray grains in a laser-assisted 3D printed Ni-based superalloy. The dendritic region was found to be under tensile strain transversely to the primary dendrite arm directions. The dendrite edges, where high level of strains and geometrically necessary dislocations were detected, were discerned as low angle grain boundaries. High angle grain boundaries were observed in the stray grain region, and the orientation of the strain tensor in this region varied dramatically at the micron scale, in contrast with the more or less homogeneous distribution in the dendritic region. (C) 2015 AIP Publishing LLC.
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