Documents disponibles écrits par cet auteur

Scaling the response of microscale compression molding of elemental Cu in the presence of dynamic recrystallization / Fanghua Mei in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2638–2645 Titre : Scaling the response of microscale compression molding of elemental Cu in the presence of dynamic recrystallization Type de document : texte imprimé Auteurs : Fanghua Mei, Auteur ; Ke Chen, Auteur ; J. Jiang, Auteur Année de publication : 2011 Article en page(s) : pp. 2638–2645 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Compression  test  Copper  High-temperature  deformation  Dynamic  recrystallization  Molding Résumé : Replication of metallic high-aspect-ratio microscale structures by direct compression molding is a promising microfabrication technique. In this paper, the micromolding response of elemental Cu is measured as a function of molding temperature. Companion tensile testing of macroscale Cu specimens was carried out at the corresponding molding temperatures. Microstructures of tensile tested macroscale Cu specimens and molded Cu specimens were characterized by combining focused ion beam (FIB) sectioning and imaging with ion-induced secondary electrons (ISEs). At all temperatures tested, measured tensile stress–strain curves for Cu show clear evidence for the occurrence of dynamic recrystallization (DRX) within macroscale tensile specimens. Additional FIB sectioning and imaging with ISEs of molded Cu specimens provide microstructural evidence for the occurrence of DRX during molding. The present results show that, even in the presence of DRX, an appropriate one-parameter scaling continues to reduce the molding response to a universal function independent of the molding temperature. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409009082 [article] Scaling the response of microscale compression molding of elemental Cu in the presence of dynamic recrystallization [texte imprimé] / Fanghua Mei, Auteur ; Ke Chen, Auteur ; J. Jiang, Auteur . - 2011 . - pp. 2638–2645. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2638–2645 Mots-clés : Compression  test  Copper  High-temperature  deformation  Dynamic  recrystallization  Molding Résumé : Replication of metallic high-aspect-ratio microscale structures by direct compression molding is a promising microfabrication technique. In this paper, the micromolding response of elemental Cu is measured as a function of molding temperature. Companion tensile testing of macroscale Cu specimens was carried out at the corresponding molding temperatures. Microstructures of tensile tested macroscale Cu specimens and molded Cu specimens were characterized by combining focused ion beam (FIB) sectioning and imaging with ion-induced secondary electrons (ISEs). At all temperatures tested, measured tensile stress–strain curves for Cu show clear evidence for the occurrence of dynamic recrystallization (DRX) within macroscale tensile specimens. Additional FIB sectioning and imaging with ISEs of molded Cu specimens provide microstructural evidence for the occurrence of DRX during molding. The present results show that, even in the presence of DRX, an appropriate one-parameter scaling continues to reduce the molding response to a universal function independent of the molding temperature. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409009082

Tribological testing of steel coupons bonded to cu-based microchannel heat exchangers / Fanghua Mei in Transactions of the ASME . Journal of tribology, Vol. 133 N° 3 (Juillet 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 07 p. Titre : Tribological testing of steel coupons bonded to cu-based microchannel heat exchangers Type de document : texte imprimé Auteurs : Fanghua Mei, Auteur ; W. J. Meng, Auteur ; Carl H. Hager, Auteur Année de publication : 2012 Article en page(s) : 07 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Cooling  Copper  Heat  exchangers  Heat  transfer  Lubrication  Mechanical  contact  Microchannel  flow  Sliding  friction  Steel  Wear  Wear  testing Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Metal-based microchannel heat exchangers (MHEs) may offer a solution to thermal management required in a unlubricated bearing with ceramic or coated rolling elements. In this paper, we report results of tribological testing on steel coupons cooled by Cu-based MHEs. Low-profile Cu-based MHEs were fabricated and bonded to steel coupons, whose front faces were made to contact a crowned rotating steel ring, with and without oil lubrication. A series of tribological tests were conducted under different conditions with and without cooling. The tests collectively show that low-profile Cu-based MHEs placed in proximity of a tribological contact can be effective in removing heat generated at the contact interface, decrease the contact interfacial friction, and mitigate the amount of interfacial wear in sliding contacts, with and without oil lubrication. The present results suggest that cooling of tribological contact zones by embedding MHEs in proximity can be beneficial to tribological performance and deserves further investigations for tribological contact applications. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Tribological testing of steel coupons bonded to cu-based microchannel heat exchangers [texte imprimé] / Fanghua Mei, Auteur ; W. J. Meng, Auteur ; Carl H. Hager, Auteur . - 2012 . - 07 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 07 p. Mots-clés : Cooling  Copper  Heat  exchangers  Heat  transfer  Lubrication  Mechanical  contact  Microchannel  flow  Sliding  friction  Steel  Wear  Wear  testing Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Metal-based microchannel heat exchangers (MHEs) may offer a solution to thermal management required in a unlubricated bearing with ceramic or coated rolling elements. In this paper, we report results of tribological testing on steel coupons cooled by Cu-based MHEs. Low-profile Cu-based MHEs were fabricated and bonded to steel coupons, whose front faces were made to contact a crowned rotating steel ring, with and without oil lubrication. A series of tribological tests were conducted under different conditions with and without cooling. The tests collectively show that low-profile Cu-based MHEs placed in proximity of a tribological contact can be effective in removing heat generated at the contact interface, decrease the contact interfacial friction, and mitigate the amount of interfacial wear in sliding contacts, with and without oil lubrication. The present results suggest that cooling of tribological contact zones by embedding MHEs in proximity can be beneficial to tribological performance and deserves further investigations for tribological contact applications. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]