User profiles for Kamel Fezzaa

Kamel Fezzaa _ كمال فزّاع

Physicist, Advanced Photon Source, Argonne National Laboratory
Verified email at anl.gov
Cited by 11531

Ultrafast x-ray phase-contrast imaging of the initial coalescence phase of two water droplets

K Fezzaa, Y Wang - Physical review letters, 2008 - APS
We report an ultrafast x-ray phase-contrast imaging study of the early merging dynamics of
two water drops in air. Owing to the edge-enhancement capability, the high penetrability, and …

Tracheal respiration in insects visualized with synchrotron X-ray imaging

MW Westneat, O Betz, RW Blob, K Fezzaa, WJ Cooper… - science, 2003 - science.org
Insects are known to exchange respiratory gases in their system of tracheal tubes by using
either diffusion or changes in internal pressure that are produced through body motion or …

Transient dynamics of powder spattering in laser powder bed fusion additive manufacturing process revealed by in-situ high-speed high-energy x-ray imaging

Q Guo, C Zhao, LI Escano, Z Young, L Xiong, K Fezzaa… - Acta Materialia, 2018 - Elsevier
Powder spattering is a major cause of defect formation and quality uncertainty in the laser
powder bed fusion (LPBF) additive manufacturing (AM) process. It is very difficult to investigate …

[HTML][HTML] Real-time monitoring of laser powder bed fusion process using high-speed X-ray imaging and diffraction

C Zhao, K Fezzaa, RW Cunningham, H Wen… - Scientific reports, 2017 - nature.com
We employ the high-speed synchrotron hard X-ray imaging and diffraction techniques to
monitor the laser powder bed fusion (LPBF) process of Ti-6Al-4V in situ and in real time. We …

[HTML][HTML] Ultrafast X-ray study of dense-liquid-jet flow dynamics using structure-tracking velocimetry

Y Wang, X Liu, KS Im, WK Lee, J Wang, K Fezzaa… - Nature Physics, 2008 - nature.com
High-speed liquid jets and sprays are complex multiphase flow phenomena with many
important industrial applications 1 , 2 . Great efforts have been devoted to understand their …

Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging

…, C Zhao, N Parab, C Kantzos, J Pauza, K Fezzaa… - Science, 2019 - science.org
We used ultrahigh-speed synchrotron x-ray imaging to quantify the phenomenon of vapor
depressions (also known as keyholes) during laser melting of metals as practiced in additive …

Critical instability at moving keyhole tip generates porosity in laser melting

C Zhao, ND Parab, X Li, K Fezzaa, W Tan, AD Rollett… - Science, 2020 - science.org
Laser powder bed fusion is a dominant metal 3D printing technology. However, porosity
defects remain a challenge for fatigue-sensitive applications. Some porosity is associated with …

[HTML][HTML] Keyhole fluctuation and pore formation mechanisms during laser powder bed fusion additive manufacturing

…, TG Fleming, SJ Clark, S Marussi, K Fezzaa… - Nature …, 2022 - nature.com
Keyhole porosity is a key concern in laser powder-bed fusion (LPBF), potentially impacting
component fatigue life. However, some keyhole porosity formation mechanisms, eg, keyhole …

[HTML][HTML] Pore elimination mechanisms during 3D printing of metals

…, C Zhao, M Qu, LI Escano, X Xiao, K Fezzaa… - Nature …, 2019 - nature.com
Laser powder bed fusion (LPBF) is a 3D printing technology that can print metal parts with
complex geometries without the design constraints of traditional manufacturing routes. …

Direct observation of pore formation mechanisms during LPBF additive manufacturing process and high energy density laser welding

…, M Qu, L Xiong, C Zhao, LI Escano, K Fezzaa… - International Journal of …, 2020 - Elsevier
Laser powder bed fusion (LPBF) is a 3D printing technology that can print parts with complex
geometries that are unachievable by conventional manufacturing technologies. However, …