About
https://www.ntu.edu.sg/mse/about-us/our-people/faculty-staff/easonchen
Activity
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🚀 Excited to share our latest project at NTU FACTS! We're developing hybrid learning content for instrument training, specifically focusing on…
🚀 Excited to share our latest project at NTU FACTS! We're developing hybrid learning content for instrument training, specifically focusing on…
Liked by Eason (Yi-Sheng) Chen
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It is the time of year to celebrate scholarly achievements! Hyeungjun (Jun) Koh has done some tremendous work over the past 5 years ... he passed…
It is the time of year to celebrate scholarly achievements! Hyeungjun (Jun) Koh has done some tremendous work over the past 5 years ... he passed…
Liked by Eason (Yi-Sheng) Chen
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Our School is hiring! Come and join us!
Our School is hiring! Come and join us!
Shared by Eason (Yi-Sheng) Chen
Experience
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The University of Sydney
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Education
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Activities and Societies: Basketball Team Golf Team
My master research was focusing on powder processing, dispersing, sintering/porosity, and their consequential thermo-mechanical/electronic properties. Learned skills and equipment include furnace heat treatment; Thermal Mechanical Analysis (TMA); Thermogravimetry & Differential Thermal Analysis (TG/DTA); Differential Scanning Calorimetry (DSC); Laser Diffraction Particle Size Analyser; Zeta Potential Analyser; Rheometer; Impedance Analyser
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Activities and Societies: Basketball Team Golf Team
Publications
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Observation of hydrogen trapping at dislocations, grain boundaries, and precipitates
Science
Hydrogen embrittlement of high-strength steel is an obstacle for using these steels in sustainable energy production. Hydrogen embrittlement involves hydrogen-defect interactions at multiple-length scales. However, the challenge of measuring the precise location of hydrogen atoms limits our understanding. Thermal desorption spectroscopy can identify hydrogen retention or trapping, but data cannot be easily linked to the relative contributions of different microstructural features. We used…
Hydrogen embrittlement of high-strength steel is an obstacle for using these steels in sustainable energy production. Hydrogen embrittlement involves hydrogen-defect interactions at multiple-length scales. However, the challenge of measuring the precise location of hydrogen atoms limits our understanding. Thermal desorption spectroscopy can identify hydrogen retention or trapping, but data cannot be easily linked to the relative contributions of different microstructural features. We used cryo-transfer atom probe tomography to observe hydrogen at specific microstructural features in steels. Direct observation of hydrogen at carbon-rich dislocations and grain boundaries provides validation for embrittlement models. Hydrogen observed at an incoherent interface between niobium carbides and the surrounding steel provides direct evidence that these incoherent boundaries can act as trapping sites. This information is vital for designing embrittlement-resistant steels.
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Observing hydrogen in steel using cryogenic atom probe tomography: A simplified approach
International Journal of Hydrogen Energy
This work demonstrates a new method to enable cryogenic atom probe tomography (cryo-APT) for the investigation of hydrogen in a high-strength steel, specifically to detect hydrogen localised to V–Mo–Nb carbides finely dispersed in the matrix. Prior cryogenic experiments required highly customised atom probe instrumentation to enable samples to be kept at cryogenic temperatures throughout the vacuum transfer process. Here we use an alternative approach without modification of the atom probe…
This work demonstrates a new method to enable cryogenic atom probe tomography (cryo-APT) for the investigation of hydrogen in a high-strength steel, specifically to detect hydrogen localised to V–Mo–Nb carbides finely dispersed in the matrix. Prior cryogenic experiments required highly customised atom probe instrumentation to enable samples to be kept at cryogenic temperatures throughout the vacuum transfer process. Here we use an alternative approach without modification of the atom probe instrument itself, whilst still achieving hydrogen mapping. Additionally, we use this method to investigate the roles of solvent and solutes within the charging electrolyte, and we demonstrate that deuterated solute is not required when using heavy water as solvent, expanding the range of electrolytes that can be utilised in APT hydrogen charging experiments. This work reduces the experimental requirements for cryo-APT and makes the technique accessible to all APT equipped laboratories.
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Hydrogen transport and trapping: from quantum effects to alloy design: discussion
Philosophical Transactions A, The Royal Society
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Direct observation of individual hydrogen atoms at trapping sites in a ferritic steel
Science
The design of atomic-scale microstructural traps to limit the diffusion of hydrogen is one key strategy in the development of hydrogen-embrittlement–resistant materials. In the case of bearing steels, an effective trapping mechanism may be the incorporation of finely dispersed V-Mo-Nb carbides in a ferrite matrix. First, we charged a ferritic steel with deuterium by means of electrolytic loading to achieve a high hydrogen concentration. We then immobilized it in the microstructure with a…
The design of atomic-scale microstructural traps to limit the diffusion of hydrogen is one key strategy in the development of hydrogen-embrittlement–resistant materials. In the case of bearing steels, an effective trapping mechanism may be the incorporation of finely dispersed V-Mo-Nb carbides in a ferrite matrix. First, we charged a ferritic steel with deuterium by means of electrolytic loading to achieve a high hydrogen concentration. We then immobilized it in the microstructure with a cryogenic transfer protocol before atom probe tomography (APT) analysis. Using APT, we show trapping of hydrogen within the core of these carbides with quantitative composition profiles. Furthermore, with this method the experiment can be feasibly replicated in any APT-equipped laboratory by using a simple cold chain.
Languages
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Chinese
Native or bilingual proficiency
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English
Full professional proficiency
More activity by Eason (Yi-Sheng)
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It is generally accepted that oxide films can mitigate (or inhibit) the entry of hydrogen atoms into steels. It may also be known that the inhibiting…
It is generally accepted that oxide films can mitigate (or inhibit) the entry of hydrogen atoms into steels. It may also be known that the inhibiting…
Liked by Eason (Yi-Sheng) Chen
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My postdoc journey at KAUST will end soon. So many wonderful memories here. I want to thank my mentors, colleagues, and friends here. Next, I'll be…
My postdoc journey at KAUST will end soon. So many wonderful memories here. I want to thank my mentors, colleagues, and friends here. Next, I'll be…
Liked by Eason (Yi-Sheng) Chen
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Thanks to everyone who joined us for the NSW P2X Technology Showcase this week as part of Climate Action Week Sydney! We had a full house at Sydney…
Thanks to everyone who joined us for the NSW P2X Technology Showcase this week as part of Climate Action Week Sydney! We had a full house at Sydney…
Liked by Eason (Yi-Sheng) Chen
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Materials Science and Engineering at Illinois professor Qian Chen has received the Materials Research Society’s 2024 Outstanding Early Career…
Materials Science and Engineering at Illinois professor Qian Chen has received the Materials Research Society’s 2024 Outstanding Early Career…
Liked by Eason (Yi-Sheng) Chen
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Just finished an array of hydrogen events in Europe, including meeting with close colleagues at the Emerging Fuels Symposium in Athens and then the…
Just finished an array of hydrogen events in Europe, including meeting with close colleagues at the Emerging Fuels Symposium in Athens and then the…
Liked by Eason (Yi-Sheng) Chen
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We hosted a visit to our lab by delegates from Academia Sinica, led by President Prof. James Liao and Vice President Prof. Mei-Yin Chou. 🤝
We hosted a visit to our lab by delegates from Academia Sinica, led by President Prof. James Liao and Vice President Prof. Mei-Yin Chou. 🤝
Liked by Eason (Yi-Sheng) Chen
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Sharing a scientific paper authored by our FACTS users. 😀 https://lnkd.in/eF-JGqry #XPS #SAXS #SEM #ScientificDiscovery #NTU
Sharing a scientific paper authored by our FACTS users. 😀 https://lnkd.in/eF-JGqry #XPS #SAXS #SEM #ScientificDiscovery #NTU
Liked by Eason (Yi-Sheng) Chen
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Sharing our latest publication on Acta Materialia about the hydrogen effects on the mechanical behavior of laser-powder bed fusion (L-PBF) fabricated…
Sharing our latest publication on Acta Materialia about the hydrogen effects on the mechanical behavior of laser-powder bed fusion (L-PBF) fabricated…
Liked by Eason (Yi-Sheng) Chen
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I am thrilled to share that I will be joining the Nanyang Technological University NTU School of Materials Science and Engineering as a tenure-track…
I am thrilled to share that I will be joining the Nanyang Technological University NTU School of Materials Science and Engineering as a tenure-track…
Liked by Eason (Yi-Sheng) Chen
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I am honor to be awarded NSTC Science and Technology Profession Medal today. Keeping passion and optimism is a course I learnt over the past two…
I am honor to be awarded NSTC Science and Technology Profession Medal today. Keeping passion and optimism is a course I learnt over the past two…
Liked by Eason (Yi-Sheng) Chen
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Check out our Imperial Centre for Cryogenic Microscopy of Materials website for more instrument details you would get to use during the…
Check out our Imperial Centre for Cryogenic Microscopy of Materials website for more instrument details you would get to use during the…
Liked by Eason (Yi-Sheng) Chen
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