Documents disponibles écrits par cet auteur

Effect of the deformation on the stress–corrosion cracking of Al–Zn–Mg–Cu alloys / G. S. Peng in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 254–258 Titre : Effect of the deformation on the stress–corrosion cracking of Al–Zn–Mg–Cu alloys Type de document : texte imprimé Auteurs : G. S. Peng, Auteur ; K. H. Chen, Auteur ; S. Y. Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 254–258 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Aluminum  alloy;  DCB;  SSRT;  stress  corrosion Résumé : The effect of deformation on the stress–corrosion cracking (SCC) of Al–Zn–Mg–Cu alloys is studied by slow strain rate technique (SSRT) and bolt-loaded double cantilever beam (DCB) tests. Results show that with the deformation increasing, the undissolved particles and subgrain size decrease whereas the fraction of recrystallization increases after solution treatment. The susceptibility to SCC by SSRT and DCB tests varies on different deformation amount alloy, in which cause is discussed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005732/abstract [article] Effect of the deformation on the stress–corrosion cracking of Al–Zn–Mg–Cu alloys [texte imprimé] / G. S. Peng, Auteur ; K. H. Chen, Auteur ; S. Y. Chen, Auteur . - 2012 . - pp. 254–258. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 254–258 Mots-clés : Aluminum  alloy;  DCB;  SSRT;  stress  corrosion Résumé : The effect of deformation on the stress–corrosion cracking (SCC) of Al–Zn–Mg–Cu alloys is studied by slow strain rate technique (SSRT) and bolt-loaded double cantilever beam (DCB) tests. Results show that with the deformation increasing, the undissolved particles and subgrain size decrease whereas the fraction of recrystallization increases after solution treatment. The susceptibility to SCC by SSRT and DCB tests varies on different deformation amount alloy, in which cause is discussed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005732/abstract

EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution / G. S. Peng in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 783–789 Titre : EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution Type de document : texte imprimé Auteurs : G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur Année de publication : 2011 Article en page(s) : pp. 783–789 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : 7150  aluminum  alloy;  EIS;  MgZn2;  original  oxide  layer;  pitting  corrosion Résumé : The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905413/abstract [article] EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution [texte imprimé] / G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur . - 2011 . - pp. 783–789. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 783–789 Mots-clés : 7150  aluminum  alloy;  EIS;  MgZn2;  original  oxide  layer;  pitting  corrosion Résumé : The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905413/abstract

The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy / G. S. Peng in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 35–40 Titre : The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy Type de document : texte imprimé Auteurs : G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur Année de publication : 2011 Article en page(s) : pp. 35–40 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : 7150  Al  alloy  Cyclic  voltammetry  EIS  Potentiodynamic  polarization  Weight-loss  measurement Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : By weight loss, potentiodynamic polarization, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) techniques complemented by optical and scanning electron microscopy observations, the effect of recrystallization on the corrosion, and electrochemical behavior of 7150 Al alloy was studied. The results indicated that the high recrystallization fraction 7150-1# was worse than the low recrystallization fraction 7150-2# on corrosion resistance. The analysis of EIS indicated that 7150-1# exhibited obvious pitting corrosion at 5 h immersion time, whereas 7150-2# showed no obvious pitting corrosion even at 33 h. The corrosion route developed along the grain boundary of recrystallization grains, not along the grain boundary of unrecrystallization grains. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905490/abstract [article] The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy [texte imprimé] / G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur . - 2011 . - pp. 35–40. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 35–40 Mots-clés : 7150  Al  alloy  Cyclic  voltammetry  EIS  Potentiodynamic  polarization  Weight-loss  measurement Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : By weight loss, potentiodynamic polarization, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) techniques complemented by optical and scanning electron microscopy observations, the effect of recrystallization on the corrosion, and electrochemical behavior of 7150 Al alloy was studied. The results indicated that the high recrystallization fraction 7150-1# was worse than the low recrystallization fraction 7150-2# on corrosion resistance. The analysis of EIS indicated that 7150-1# exhibited obvious pitting corrosion at 5 h immersion time, whereas 7150-2# showed no obvious pitting corrosion even at 33 h. The corrosion route developed along the grain boundary of recrystallization grains, not along the grain boundary of unrecrystallization grains. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905490/abstract

Underhood buoyancy driven flow / Parviz Merati in Journal of heat transfer, Vol. 133 N° 8 (Août 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 8 (Août 2011) . - pp. [082502/1-9] Titre : Underhood buoyancy driven flow : an experimental study Type de document : texte imprimé Auteurs : Parviz Merati, Auteur ; Charles Davis, Auteur ; K. H. Chen, Auteur Année de publication : 2011 Article en page(s) : pp. [082502/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Underhood  buoyancy  PIV  Thermal  measurements  Thermal  soak Index. décimale : 536 Chaleur. Thermodynamique Résumé : Particle image velocimetry and thermal measurements using thermocouples are used to measure the buoyant flow of a simplified full-scale model of an engine compartment. The engine block surface temperature and exhaust heaters are kept at about 100 and 600°C, respectively. Thermal measurements include enclosure surface temperature, temperature difference on the enclosure wall at midplane, engine block temperatures, and air temperatures under the hood. The highest surface temperatures were concentrated near the top of the enclosure around the exhaust heaters. This effect was due primarily to radiation from the exhaust heaters. Highest measured air temperature was about 300°C immediately above the right exhaust heater. The measured dominant flow structures are two larger counter rotating vortices over the top right side of the engine block and two counter rotating vortices over the top left side. These flow structures weaken considerably during the first 35 min of the transient cool down of the engine block and the exhaust heaters. Colder ambient air is sucked into the engine compartment at the vents near the bottom of the compartment with some exiting as hot air through the top slots. The time scale of the fluid exchange at the vents is in the order of seconds, indicating that this process is occurring very slowly. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...] [article] Underhood buoyancy driven flow : an experimental study [texte imprimé] / Parviz Merati, Auteur ; Charles Davis, Auteur ; K. H. Chen, Auteur . - 2011 . - pp. [082502/1-9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 8 (Août 2011) . - pp. [082502/1-9] Mots-clés : Underhood  buoyancy  PIV  Thermal  measurements  Thermal  soak Index. décimale : 536 Chaleur. Thermodynamique Résumé : Particle image velocimetry and thermal measurements using thermocouples are used to measure the buoyant flow of a simplified full-scale model of an engine compartment. The engine block surface temperature and exhaust heaters are kept at about 100 and 600°C, respectively. Thermal measurements include enclosure surface temperature, temperature difference on the enclosure wall at midplane, engine block temperatures, and air temperatures under the hood. The highest surface temperatures were concentrated near the top of the enclosure around the exhaust heaters. This effect was due primarily to radiation from the exhaust heaters. Highest measured air temperature was about 300°C immediately above the right exhaust heater. The measured dominant flow structures are two larger counter rotating vortices over the top right side of the engine block and two counter rotating vortices over the top left side. These flow structures weaken considerably during the first 35 min of the transient cool down of the engine block and the exhaust heaters. Colder ambient air is sucked into the engine compartment at the vents near the bottom of the compartment with some exiting as hot air through the top slots. The time scale of the fluid exchange at the vents is in the order of seconds, indicating that this process is occurring very slowly. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...]