Wenli PEI
,
Fazeng LIAN
,
Guiqin ZHOU
,
Jinguo LI
材料科学技术（英文）
In this article, the quenched Nd4.5Fe75Co1Si1B18.5 ribbons were prepared, and the structures and properties were investigated. The results show that the change of structures of Nd4.5Fe75Co1Si1B18.5 quenched amorphous ribbons is Am-->Am' +Fe3B+ Nd2Fe23B3+ Nd2Fe14B-->Fe-3 B+Nd2Fe14B when it is heated. The effect of crystallizing treatment temperature and time on the magnetic properties of the quenched alloy was studied. The magnetic properties of 16 m/s quenched ribbons for 710 degrees Cx1200 s crystallizing treatment reach H-i(c)=238.6 kA/m, B-r=0.8987 T and (BH)(max)=51.39 kJ/m(3). The grain size is about D-Fe3B=32 nm and D-Nd2Fe14B=22 nm.
关键词:
Guiqin ZHOU
,
Fazeng LIAN
,
Guozhen LI
材料科学技术（英文）
The influence of alloy elements on de and ac magnetic properties of Fe79M2Si6B11C2(M is V, Mo or Cr) amorphous alloys was investigated. The variation law of the magnetic properties and the loss with the different elements was studied. The results show that the addition of V, Cr or Mo elements reduces the saturation magnetic induction in varying degrees. The addition of V element increases the permeability, decreases the coercivity and drops the loss. The addition of Cr and Mo reduces the permeability, and increases the coercivity.
关键词:
Wenli PEI
,
Fazeng LIAN
,
Guiqin ZHOU
材料科学技术（英文）
In this paper, the technology, structures and magnetic properties of Nd4.5Fe76Co1B18.5 nanocomposite magnets were investigated. The effect of crystallizing treatment temperature and time on structures and magnetic properties of Nd4.5Fe76Co1B18.5 amorphous ribbons was studied. The results show that Nd4.5Fe76Co1B18.5 containing more analogue metals is easy to form a morphous. The magnetic properties of 16 m/s quenched ribbon for 710 degrees Cx900 s crystallizing treatment reach H-i(c)=242.1 kA/m, B-r=0.9410 T and (BH)(max)=59.64 kJ/m(3). The even grain size is about D-Fe3B=34 nm and D-Nd2Fe14B=23 nm.
关键词:
吴向东
,
万敏
,
周贤宾
材料科学与工艺
doi:10.3969/j.issn.1005-0299.2004.04.015
针对建立的十字形双向拉伸试验系统,利用有限元模拟优化得到的十字形试件,采用载荷控制方式对SPEN钢板和2024-O铝合金板进行了不同加载路径下的双向拉伸试验,得到了不同硬化阶段下的实验屈服轨迹,并与现有屈服准则Hill48、Hill79、Hill90、Hill93、Gotoh、Hosford、Barlat-Lian以及Mises的理论屈服轨迹进行了对比.结果表明:对于SPEN钢板,Hosford各向异性屈服准则得到的理论屈服轨迹与实验屈服轨迹符合得最好,其次是Mises屈服准则,Hill48屈服准则最差;对2024-O铝合金板,Barlat89、Hosford屈服轨迹与实验屈服轨迹符合得最好,Mises屈服准则最差.
关键词:
双向拉伸试验
,
十字形试件
,
各向异性
,
屈服准则
