HAN Qingyou HU Hanqi Beijing University of Science and Technology
,
Beijing
,
China [Originally published in ACTA METALL SIN (CHINESE EDN) 24 (5) 1988 pp B320—B324
,
received 29 August 1986
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in revised form 5 March 1987]
金属学报(英文版)
The gradient of the equilibrium melting temperature distribution at the advancing liquid-solid interface of liquid side was derived.From which,a parameter,H,used for evaluating the abili- ty of grain refinement of solute elements was proposed.Experiments on Al-based alloys show that the grain size decreases as the value of parameter,H,increases.Such a dependance indi- cates that the parameter H can be used for choosing grain refiner.
关键词:
solute elements
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null
Ieee Transactions on Magnetics
The Y-3(Fe0.96Ti0.04)(29) compound has a monoclinic Nd-3(Fe,Ti)sg-type (P21/c) structure, and an easy-cone type anisotropy, The Curie temperature Te of the monoclinic 3:29-type Y-3(Fe0.96Ti0.04)(29) is about 403 K, which is slightly higher than that of the 2:17-type Y2Fe17 (325 K) and lower than that of the 1:12-type YFe11Ti (524 K). The average iron magnetization of the Y-3(Fe0.96Ti0.04)(29) is 1.87 mu (B) at 4.2 K, This value is higher than the corresponding value of 1.7 mu (B) for the 1:12-type one, and lower than the value of 2.01 mu (B) for the Y2Fe17 one. These results confirm the fact that 3:29-type structure is the intermediate between the 2:17-type and 1:12-type ones.
关键词:
3 : 29-type Y-3(Fe0.96Ti0.04)(29);anisotropy;magnetization;easy-cone;permanent magnets;magnetocrystalline anisotropy;phase
Xinguo ZHAO
,
Zhidong ZHANG
,
Zhijun GUO
,
Wei LIU
,
Dianyu GENG
,
Baozhi CUI
材料科学技术（英文）
The alloy with nominal composition Sm-2(Fe0.94Ti0.06)(l7) is prepared by are-melting, hydrogenation and nitrogenation processes. The Sm-2(Fe0.94Ti0.06)(17) alloy has a single phase of Sm-3(Fe, Ti)(29) with the Nd-3(Fe, Ti)(29)-type structure. The corresponding hydride phase with the same phase structure of the parent alloy was formed after a hydrogen decrepitation (HD) process at 300 degrees C. The hydrogenation at 800 degrees C mainly shows a HDDR process. The HD and nitrogenation at 500 degrees C result in increasing the Curie temperature of the alloy by 72 degrees C and by 158 degrees C due to lattice expansions, respectively. The anisotropic and isotropic Sm-3(Fe, Ti)(29)Ny magnets are obtained after HD, HDDR and the consequent nitrogenation, respectively. The optimum magnetic properties of Sm-3(Fe, Ti)(29)Ny powders achieved in the above two processes are: (i) B-r=0.82 T, H-i(c)=4.48 kA/cm, (BH)(max)=54.3 kJ/m(3), (ii) B-r=0.68 T, H-i(c)=8.14 kA/cm, (BH)(max)=66.4 kJ/m(3).
关键词:
材料科学技术（英文）
The alloy with nominal composition Sm-2(Fe0.94Ti0.06)(l7) is prepared by are-melting, hydrogenation and nitrogenation processes. The Sm-2(Fe0.94Ti0.06)(17) alloy has a single phase of Sm-3(Fe, Ti)(29) with the Nd-3(Fe, Ti)(29)-type structure. The corresponding hydride phase with the same phase structure of the parent alloy was formed after a hydrogen decrepitation (HD) process at 300 degrees C. The hydrogenation at 800 degrees C mainly shows a HDDR process. The HD and nitrogenation at 500 degrees C result in increasing the Curie temperature of the alloy by 72 degrees C and by 158 degrees C due to lattice expansions, respectively. The anisotropic and isotropic Sm-3(Fe, Ti)(29)Ny magnets are obtained after HD, HDDR and the consequent nitrogenation, respectively. The optimum magnetic properties of Sm-3(Fe, Ti)(29)Ny powders achieved in the above two processes are: (i) B-r=0.82 T, H-i(c)=4.48 kA/cm, (BH)(max)=54.3 kJ/m(3); (ii) B-r=0.68 T, H-i(c)=8.14 kA/cm, (BH)(max)=66.4 kJ/m(3).
关键词:
sm
梁志梅
,
崔春翔
,
孙继兵
功能材料
研究了Sm3(Fe,Ti,Co)29母合金的制备工艺,并对合金元素的选择及添加量进行了探讨.试验研究发现Ti元素可有效抑制α-Fe的生成并起到稳定Sm-Fe 3:29相的作用;熔炼时至少熔炼四遍可得到组织均匀的铸态试样;合理设计加料顺序可以减小Sm的挥发量,多加入20%～30%的Sm可有效的补偿Sm的挥发.成功的制备了Sm3(Fe,Ti,Co)29 3:29相母合金.
关键词:
永磁材料
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Sm3(Fe
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Co
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Ti)29Nx
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HDDR
李述军
,
杨锐
,
李曙
,
郝玉琳
,
崔玉友
,
M.Niinomi
金属学报
doi:10.3321/j.issn:0412-1961.2002.z1.083
利用环块式腐蚀磨损试验机研究了Ti-29Nb-13Ta-4.6Zrβ型医用钛合金的磨损特性,并与传统医用钛合金Ti-6Al-4V进行了比较.研究表明:在空气中干磨,Ti-29Nb-13Ta-4.6Zr合金及Ti-6Al-4V合金的抗磨能力主要取决于合金的硬度及抗拉强度等力学性能;在0.9%NaCl溶液中磨损,Ti-29Nb-13Ta-4.6Zr合金抗腐蚀磨损能力低于Ti-6Al-4V.Nb含量的提高可以增强Ti-29Nb-13Ta-4.6Zr合金的抗腐蚀磨损能力.
关键词:
新型医用β钛合金
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干磨
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腐蚀磨损
Journal of Physics-Condensed Matter
A series of Gd-3(Fe1-x-yCoyTix)(29) (x = 0.011-0.034, y = 0-0.393) Samples have been prepared. Single-phase samples assigned as 3:29 compounds with the monoclinic lattice are obtained in the following composition regions: x; = 0.011, 0 less than or equal to y less than or equal to 0.307; x = 0.022, 0 less than or equal to y less than or equal to 0.313; and x = 0.034, 0 less than or equal to y less than or equal to 0.393. The solid-solution limit of cobalt in Gd-3(Fe1-x-yCOyTix)(29) increases with the Ti content. The cell parameters a, b and c show anisotropic decreases with the Co content, i.e. a and b decrease significantly and c decreases slightly in the composition range investigated. The Curie temperature is increased by the substitution of Co for Fe in Gd-3(Fe1-x-yCoyTx)(29). The saturation magnetization first increases and then decreases with the Co content. The dependence of the intrinsic magnetic properties of Gd-3(Fe1-x-yCoyTix)(29) on the Co and Ti contents is presented. The compounds exhibit an easy-magnetization direction on the a-b plane corresponding to the CaCu5-type structure at room temperature. The anisotropy field H-a of Gd-3(Fe1-x-yCoyTix)(29) is decreased and the magnetocrystalline anisotropy constant K-1 is increased by the substitution of Co for Fe. No spin reorientation is observed in the alternating-current susceptibility measurement between 77 K and the Curie temperature.
关键词:
neutron-diffraction;phase;gd;nd;sm;system;anisotropy;r=ce;r=y;tb
郭卫民
,
潘雄
,
刘奇
,
唐龙
,
张平
功能材料
主要研究了FeNi29CO18MnSi合金材料的热电特性,分析了Ni-Co合金、Ni-Fe合金的热电性能,研究了FeNi29Co18MnSi合金中Mn、Si含量及冷形变对合金热电势的影响.研究表明,随着微量添加元素Mn、Si含量的增加,合金单极对铂(Pt)的热电势绝对值减小,且合金冷形变对热电势具有较大的调整作用.
关键词:
热电势
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热电偶合金
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FeNiCo合金
