Laser‐induced reversion of precipitates in an Al‐Li alloy: Study on temperature rise in pulsed laser atom probe

The influence of tuning the laser pulse energy during the analyses on the resulting microstructure in a specimen utilizing an ultra-fast laser assisted atom probe was demonstrated by a case study of a binary Al-Li alloy. The decomposition parameters, such as the size, number density, volume fraction...

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Bibliographic Details
Published in:Microscopy research and technique 2016-08, Vol.79 (8), p.727-737
Main Authors: Khushaim, Muna, Gemma, Ryota, Al-Kassab, Talaat
Format: Article
Language:English
Subjects:
Estimates
Heating
Laser beam heating
Lasers
Precipitates
Precipitation
Reversion
Tuning
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Summary:The influence of tuning the laser pulse energy during the analyses on the resulting microstructure in a specimen utilizing an ultra-fast laser assisted atom probe was demonstrated by a case study of a binary Al-Li alloy. The decomposition parameters, such as the size, number density, volume fraction, and composition of [Formulaomitted] precipitates, were carefully monitored after each analysis. A simple model was employed to estimate the corresponding specimen temperature for each value of the laser energy. The results indicated that the corresponding temperatures for the laser pulse energy in the range of 10 to 80 pJ are located inside the miscibility gap of the binary Al-Li phase diagram and fall into the metastable equilibrium field. In addition, the corresponding temperature for a laser pulse energy of 100 pJ was in fairly good agreement with reported range of [Formulaomitted] solvus temperature, suggesting a result of reversion upon heating due to laser pulsing. Microsc. Res. Tech. 79:727-737, 2016.
ISSN:1059-910X
1097-0029
DOI:10.1002/jemt.22691