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Effect of a high magnetic field on the Al–Al3Ni fiber eutectic during directional solidification / Xi Li in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2430–2441 Titre : Effect of a high magnetic field on the Al–Al3Ni fiber eutectic during directional solidification Type de document : texte imprimé Auteurs : Xi Li, Auteur ; Yves Fautrelle, Auteur ; Zhongming Ren, Auteur Année de publication : 2011 Article en page(s) : pp. 2430–2441 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : High  magnetic  field  Al–Al3Ni  fiber  eutectic  Eutectic  fiber  spacing  Preferred  orientation  relationship Résumé : The effect of a high magnetic field on the morphology and preferred orientation relationship of the Al–Al3Ni fiber eutectic has been investigated during directional solidification. Results indicate that an application of a high magnetic field has decreased the eutectic spacing and caused the appearance of the band-like structure. Moreover, it has been found that a high magnetic field has changed the preferred orientation relationship of the Al–Al3Ni eutectic. Indeed, the application of a 12 T high magnetic field has caused the preferred orientation relationship of the Al{3 3 1}//Al3Ni{0 0 1}; Al [1 1 0]//Al3Ni[0 1 0] in the case of no magnetic field to transfer into the Al{0 0 1}//Al3Ni{1 0 2}; Al[1 0 2]// Al3Ni[0 1 0]. Further, in order to investigate the nucleation and growing mechanism of the Al–Al3Ni eutectic, the growth and morphology relationships between the Al–Al3Ni eutectic and the primary Al and Al3Ni phases have been investigated during volume and directional solidification, respectively. It has been found that the growth and orientation of the primary Al3Ni phase and the heating flow extraction direction have determined the growth of the Al–Al3Ni eutectic. This implies that the Al–Al3Ni eutectic growth may be capable of being controlled by adjusting the alignment of the Al3Ni eutectic phase and the heating flow extraction direction. The above experimental results have been discussed from the effect of a high magnetic field on the diffusion process and the epitaxial growth of the eutectic. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008751 [article] Effect of a high magnetic field on the Al–Al3Ni fiber eutectic during directional solidification [texte imprimé] / Xi Li, Auteur ; Yves Fautrelle, Auteur ; Zhongming Ren, Auteur . - 2011 . - pp. 2430–2441. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2430–2441 Mots-clés : High  magnetic  field  Al–Al3Ni  fiber  eutectic  Eutectic  fiber  spacing  Preferred  orientation  relationship Résumé : The effect of a high magnetic field on the morphology and preferred orientation relationship of the Al–Al3Ni fiber eutectic has been investigated during directional solidification. Results indicate that an application of a high magnetic field has decreased the eutectic spacing and caused the appearance of the band-like structure. Moreover, it has been found that a high magnetic field has changed the preferred orientation relationship of the Al–Al3Ni eutectic. Indeed, the application of a 12 T high magnetic field has caused the preferred orientation relationship of the Al{3 3 1}//Al3Ni{0 0 1}; Al [1 1 0]//Al3Ni[0 1 0] in the case of no magnetic field to transfer into the Al{0 0 1}//Al3Ni{1 0 2}; Al[1 0 2]// Al3Ni[0 1 0]. Further, in order to investigate the nucleation and growing mechanism of the Al–Al3Ni eutectic, the growth and morphology relationships between the Al–Al3Ni eutectic and the primary Al and Al3Ni phases have been investigated during volume and directional solidification, respectively. It has been found that the growth and orientation of the primary Al3Ni phase and the heating flow extraction direction have determined the growth of the Al–Al3Ni eutectic. This implies that the Al–Al3Ni eutectic growth may be capable of being controlled by adjusting the alignment of the Al3Ni eutectic phase and the heating flow extraction direction. The above experimental results have been discussed from the effect of a high magnetic field on the diffusion process and the epitaxial growth of the eutectic. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008751

Morphological instabilities and alignment of lamellar eutectics during directional solidification under a strong magnetic field / Xi Li in Acta materialia, Vol. 58 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1403–1417 Titre : Morphological instabilities and alignment of lamellar eutectics during directional solidification under a strong magnetic field Type de document : texte imprimé Auteurs : Xi Li, Auteur ; Zhongming Ren, Auteur ; Yves Fautrelle, Auteur Année de publication : 2011 Article en page(s) : pp. 1403–1417 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Lamellar  eutectics  Morphological  instabilities  Strong  magnetic  field  Alignment  Directional  solidification Résumé : The effects of a strong magnetic field on Al–Al2Cu and Pb–Sn lamellar eutectics during directional solidification have been investigated experimentally. The results show that the application of a strong magnetic field caused “tilting and oscillatory” morphological instabilities and deformation of the eutectic lamellae. Moreover, it was found that the Al–Al2Cu eutectic grain became aligned under a strong magnetic field and that with an increase in the magnetic field intensity this alignment was gradually enhanced. Further, the stresses caused by the magnetization force and the thermoelectric magnetic force during directional solidification under a strong magnetic field were analyzed and it was found that they are likely responsible for the “tilting and oscillatory” morphological instabilities and deformation. This is experimental evidence that the stresses imposed on a solid are capable of inducing the morphological instabilities of lamellar eutectics. The magnetic crystalline anisotropy of the Al2Cu phases and the growth relationship between the primary Al2Cu phase and the eutectic phases was investigated and it was found that the Al2Cu phase had a remarkable magnetic crystalline anisotropy which determined the growth of the Al–Al2Cu eutectic grain. Thus, alignment of the Al–Al2Cu eutectic grain under a strong magnetic field may be attributed to the magnetic crystalline anisotropy of the Al2Cu phase. Based on the growth behaviour of Al–Al2Cu and Pb–Sn lamellar eutectics under a strong magnetic field, an alignment model of lamellar eutectics during directional solidification under a strong magnetic field is proposed. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007514 [article] Morphological instabilities and alignment of lamellar eutectics during directional solidification under a strong magnetic field [texte imprimé] / Xi Li, Auteur ; Zhongming Ren, Auteur ; Yves Fautrelle, Auteur . - 2011 . - pp. 1403–1417. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1403–1417 Mots-clés : Lamellar  eutectics  Morphological  instabilities  Strong  magnetic  field  Alignment  Directional  solidification Résumé : The effects of a strong magnetic field on Al–Al2Cu and Pb–Sn lamellar eutectics during directional solidification have been investigated experimentally. The results show that the application of a strong magnetic field caused “tilting and oscillatory” morphological instabilities and deformation of the eutectic lamellae. Moreover, it was found that the Al–Al2Cu eutectic grain became aligned under a strong magnetic field and that with an increase in the magnetic field intensity this alignment was gradually enhanced. Further, the stresses caused by the magnetization force and the thermoelectric magnetic force during directional solidification under a strong magnetic field were analyzed and it was found that they are likely responsible for the “tilting and oscillatory” morphological instabilities and deformation. This is experimental evidence that the stresses imposed on a solid are capable of inducing the morphological instabilities of lamellar eutectics. The magnetic crystalline anisotropy of the Al2Cu phases and the growth relationship between the primary Al2Cu phase and the eutectic phases was investigated and it was found that the Al2Cu phase had a remarkable magnetic crystalline anisotropy which determined the growth of the Al–Al2Cu eutectic grain. Thus, alignment of the Al–Al2Cu eutectic grain under a strong magnetic field may be attributed to the magnetic crystalline anisotropy of the Al2Cu phase. Based on the growth behaviour of Al–Al2Cu and Pb–Sn lamellar eutectics under a strong magnetic field, an alignment model of lamellar eutectics during directional solidification under a strong magnetic field is proposed. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007514