Dr. Lijun Song Profile

Dr. Lijun Song

at Univ of Michigan

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Proceedings Article | 7 February 2012 Paper

Identification of phase transformation using optical emission spectroscopy for direct metal deposition process

Lijun Song, Cunshan Wang, Jyoti Mazumder

Proceedings Volume 8239, 82390G (2012) https://doi.org/10.1117/12.908264

KEYWORDS: Plasma, Nickel, Iron, Materials processing, Spectroscopy, Scanning electron microscopy, Laser processing, Plasma generation, Binary data, Metals

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Service performance of all materials is determined by the structure-property relationship of the materials. However, the analysis of microstructure of an alloy has, to date, been limited to time- and labor-intensiveanalysis such as optical or scanning electron microscopes after material is synthesized. Presently there is no known method determining the microstructure during the material synthesis process. Here we report that the phase transformation can affect the characteristics of laser induced plasma during a direct laser material synthesis process. The plasma spectral line intensity ratio from different elements is only proportional to the elemental concentration within the same phase. The linear relationship is broken when there is a phase change and a new linear relationship is formed within the range of the new phase. This phase related plasma change indicates the initial nucleation of the crystallography of the alloy in early stage. This phase determined plasma characteristics will be applicable for in-situ phase transformation identification in real time during material synthesis process where plasma is generated. For synthesis where plasma is not generated, pulsed laser induced plasma can be used to sample the synthesized material for phase identification.

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