Liu
,
B.X. Kang
,
X.G. Cao
,
J.L. Huang
,
B. Yinand H.C. Gu (Institute of Materials Science and Engineering
,
Xi'an Jiaotong University
,
Xi'an 710049
,
China)(Institute of Materials Science and Engineering
,
Xi'an Jiaotong University
,
Xi'an 710049
,
China)( Department of Materials Engineering
,
Luoyang Institute of Technology
,
Luoyang 471049
,
China)( Department of Materials Engineering
,
Luoyang Institute of Technology
,
Luoyang 471049
,
China)( Department of Materials Engineering
,
Luoyang Institute of Technology
,
Luoyang 471049
,
China)( Department of Materials Engineering
,
Luoyang Institute of Technology
,
Luoyang 471049
,
China)
金属学报(英文版)
In this paper; the recrystallization process during aging for a rapidly solidified Cu-Cr-Zr-Mg alloy has been investigated. It is found that the discotinuous crystallization process has been partially retarded by the ultra-fine and dispersed precipitation upon aging after deformation. Thus, a phenomenon of combined in situ and discontinuous recrystallization has been observed in the rapidly solidified Cu-Cr-Zr-Mg alloy.On the nucleation and growth of recrystallization, the precipitated phases are coarscned and dissolved in the front of grain boundaries following a re-precipitation in the recrystallization area,which results in the much more dispersed precipitates.
关键词:
rapid solidification; Cu-Cr-Zr-Mg alloy; aging precipitation; recrystallization
X.G. Cao
,
J.L. Huang
金属学报(英文版)
Rapidly quenching embrittlement (RQE) sometimes appears in Fe73.5 Cu1 Nb3Si13.5B9nanocrystalline soft magnetic alloy (FINEMET) during production process. As a re-sult of RQE the ductility of the as-quenched ribbon drops seriously. The mechanism ofRQE has been elucidated in the recent works of current authors. It was believed thatRQE is due to the structural relaxation but not related to α-Fe(Si) crystallization. Inthis paper, the high resolution TEM (HRTEM) method and image digital processingwere applied to analyze the HRTEM images of two FINEMET rapidly quenched rib-bons with different thicknesses in detail. In the thinner ductile sample, the orderingdomains with the size of about 3nm are observed. In the thicker RQE sample, themetastable nanocrystalline domains with the size are 18nm are observed along with thestructural relaxation. These domains seem to have Fe3B-like metastable phase struc-ture on nanometer scale. The result indicates that the local atomic ordering regionsextend when RQE induced by structural relaxation occurs.
关键词:
HRTEM
,
null
,
null
,
null
,
null
