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Aging Behavior of Mg-Y-Zr and Mg-Nd-Zr Cast Alloys 被引量:1
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作者 yang-do kim Nam-Hyun Kang +2 位作者 Il-Guk Jo Kyung-Hyun kim In-Bae kim 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第1期80-84,共5页
Aging behavior of Mg-3.6Y-0.5Zr and Mg-2.TNd-0.5Zr alloys was investigated by microhardness measurement and transmission electron microscopy.In the case of Mg-Y-Zr alloy,the presence ofβ″phase,a major strength- ener... Aging behavior of Mg-3.6Y-0.5Zr and Mg-2.TNd-0.5Zr alloys was investigated by microhardness measurement and transmission electron microscopy.In the case of Mg-Y-Zr alloy,the presence ofβ″phase,a major strength- ener,having base centered orthorhombic structure with its lattice constants of a-(β″)=0.64 nm,b-(β″)=2.22 nm, and c-(β″)=0.52 nm was identified.In the case of Mg-Nd-Zr alloy aged at 250℃,the presence ofβ″andβ′phases was identified.The crystal structure ofβ″phase was found to be DO-(19) and its orientation relationships with Mg matrix were [0001]-(β″)//[0001]-(Mg) and [01(?)0]-(β″)//[01(?)0]-(Mg).Theβ′phase had face centered cubic structure and its orientation relationships with Mg matrix were [011]-(β′)//[0001]-(Mg) and [(?)1(?)]β′//[(?)110])-(Mg). The Mg-2.TNd-0.5Zr alloy showed higher hardness compared with Mg-3.6Y-0.5Zr alloy. 展开更多
关键词 Mg-Y-Zr alloy Mg-Nd-Zr alloy Precipitation sequence
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Texture development and grain boundary phase formation in Ce-and Ce-La-substituted Nd-Fe-B magnets during hot-deformation process
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作者 Ga-Yeong kim Tae-Hoon kim +4 位作者 Hee-Ryoung Cha Sang-hyub Lee Dong-Hwan kim yang-do kim Jung-Goo Lee 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第31期71-79,共9页
In this study,the influence of Ce-and Ce-La-substitution for Nd in Nd-Fe-B magnets on their magnetic and microstructural changes in the course of the hot-deformation process was investigated to gain insight into furth... In this study,the influence of Ce-and Ce-La-substitution for Nd in Nd-Fe-B magnets on their magnetic and microstructural changes in the course of the hot-deformation process was investigated to gain insight into further reducing the Nd content in fine-grained Nd-Fe-B hot-deformed magnets.We found that the[001]texture and microstructure of the RE-rich grain boundary phases,which are the factors that de-termine the remanence and coercivity of hot-deformed magnets,were deteriorated by the Ce-and Ce-La-substitution.This is because the volume fraction of the RE-rich liquid formed in the grain boundaries during the hot-press and hot-deformation decreased due to the Ce-and Ce-La-substitution,thereby in-creasing the friction between the 2:14:1 grains while the c-axes of grains were aligned by grain rotation and decreasing the RE concentration of grain boundary phases.In particular,the Ce-La-co-substitution further prevented the liquid formation within the grain boundaries of the magnets during hot-press and hot-deformation because the wettability of the RE-rich liquid on the 2:14:1 grains became poor when La was substituted for Nd in the 2:14:1 grains.These results indicate that there is room for further im-provement in both the remanence and coercivity of the Ce-and Ce-La-substituted magnets by intro-ducing additional liquid into the grain boundaries prior to hot-press and hot-deformation.By applying the Nd-Cu infiltration process to the melt-spun ribbons(intermediate infiltration,I-infiltration),both the remanence and coercivity of the Nd-saving(Nd 0.7 Ce 0.3)-Fe-B and(Nd 0.7 Ce 0.225 La 0.075)-Fe-B hot-deformed magnets were successfully improved. 展开更多
关键词 Nd-Fe-B magnets Hot-deformation Nd-saving Ce-substitution La-substitution INFILTRATION
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