TY - JOUR
T1 - Comparative study of the effect of cold rolling on the structure of Al-RE-Ni-Co (RE = rare-earth metals) amorphous and glassy alloys
AU - Louzguine-Luzgin, D. V.
AU - Inoue, A.
N1 - Funding Information:
This work was supported by the Research and Development Project on Advanced Metallic Glasses, Inorganic Materials and Joining Technology and the Grant-in-Aid (Wakate B) of Ministry of Education, Sports, Culture, Science and Technology, Japan N: 16760559. The authors sincerely thank I. Yoshii, T. Kanomata and H.M. Kimura from Institute for Materials Research for help with cold rolling technique.
PY - 2006/10/1
Y1 - 2006/10/1
N2 - The present paper aims to compare the deformation-induced crystallization behavior of the rapidly solidified ribbon samples of Al85Y8Ni5Co2, Al85Nd8Ni5Co2, Al85Gd8Ni5Co2 and Al85Mm8Ni5Co2 non-crystalline alloys subjected to cold rolling with 33% reduction. It is found that amorphous Al85Y8Ni5Co2 alloys exhibiting glass-transition and Al85Nd8Ni5Co2 alloys exhibiting no glass-transition have somewhat different stabilities against crystallization under deformation at room temperature though their crystallization temperatures under heating without load or deformation are almost equal. Al85Gd8Ni5Co2 and Al85Mm8Ni5Co2 alloys (Mm = Mischmetal) did not exhibit deformation-induced crystallization at the reduction ratio used. Although, the formation of the primary nanoscale α-Al particles was observed in both Al85Y8Ni5Co2 and Al85Nd8Ni5Co2 alloys after the cold rolling, the size and volume fraction of the particles are larger in the Nd-bearing amorphous alloy as compared to the Y-bearing alloy. It is found that contrary to crystallization on heating no intermetallic compounds but only α-Al nano particles were formed during the deformation-induced crystallization of Al85RE8Ni5Co2 amorphous alloys. The local heating on deformation is hypothesized to affect the crystallization.
AB - The present paper aims to compare the deformation-induced crystallization behavior of the rapidly solidified ribbon samples of Al85Y8Ni5Co2, Al85Nd8Ni5Co2, Al85Gd8Ni5Co2 and Al85Mm8Ni5Co2 non-crystalline alloys subjected to cold rolling with 33% reduction. It is found that amorphous Al85Y8Ni5Co2 alloys exhibiting glass-transition and Al85Nd8Ni5Co2 alloys exhibiting no glass-transition have somewhat different stabilities against crystallization under deformation at room temperature though their crystallization temperatures under heating without load or deformation are almost equal. Al85Gd8Ni5Co2 and Al85Mm8Ni5Co2 alloys (Mm = Mischmetal) did not exhibit deformation-induced crystallization at the reduction ratio used. Although, the formation of the primary nanoscale α-Al particles was observed in both Al85Y8Ni5Co2 and Al85Nd8Ni5Co2 alloys after the cold rolling, the size and volume fraction of the particles are larger in the Nd-bearing amorphous alloy as compared to the Y-bearing alloy. It is found that contrary to crystallization on heating no intermetallic compounds but only α-Al nano particles were formed during the deformation-induced crystallization of Al85RE8Ni5Co2 amorphous alloys. The local heating on deformation is hypothesized to affect the crystallization.
KW - Alloys
KW - Crystallization
KW - TEM/STEM
KW - Transition metals
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U2 - 10.1016/j.jnoncrysol.2006.06.022
DO - 10.1016/j.jnoncrysol.2006.06.022
M3 - Article
AN - SCOPUS:33748463202
VL - 352
SP - 3903
EP - 3909
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
IS - 36-37
ER -