Y. Chen
,
X. Chen
,
Q.F. Wang
金属学报(英文版)
The systematic chemical compositions including common C, Si, Mn, Al, and micro- alloying elements of Ti and Nb were designed for high volume fraction of retained austenite as much as possible. The thermo-cycle experiments were conducted by using Gleeble 2000 thermo-dynamic test machine for finding the appropriate composition. The experimental results showed that chemical composition had a significant effect on retained austenite, and the appropriate compositions were determined for commercial production of TRIP steels.
关键词:
carbon content
,
null
,
null
,
null
,
null
李开明
,
李亚洲
,
冯维贵
,
林长
量子电子学报
doi:10.3969/j.issn.1007-5461.2007.05.014
采用非线性反馈控制,用附加了带参数的正弦项对Chen系统进行了有效的控制.随着参数k的逐渐增大,系统的动力学行为呈现出一系列的变化.数值研究结果表明:随控制参数的增大,驱动信号的强度渐大,混沌系统由混沌运动到周期轨道,最终到一相点.
关键词:
混沌
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Chen系统
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不动点
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Lyapunov指数
,
反馈控制
Ieee Transactions on Magnetics
The microstructure, magnetic properties and magnetostriction of Tb0.2Pr0.8(Fe0.4Co0.6)(infinity) (1.65 less than or equal to x less than or equal to 1.90) alloys has been studied. The Curie temperatures for the 1:2 and 1:3 phases decrease with increasing x, whereas the saturation magnetization increases with increasing cc. The remanent magnetization remains almost constant for all the samples and the coercivity decreases with increasing x. The spontaneous magnetostriction (lambda (111)) estimated from the splitting of the (440) lines is found to decrease with increasing x. The largest lambda (111) recorded for Tb0.2Pr0.8(Fe0.4Co0.6)(1.65) is 2900 ppm at room temperature.
关键词:
Laves phase;microstructure;spontaneous magnetostriction;alloys
Y.M.Hao1) and Y.Gao2) 1)Department of Physics
,
Tianjin Normal University
,
Tianjin 300074
,
China 2)Library
,
Tianjin Normal University
,
Tianjin 300074
,
China
金属学报(英文版)
tructuraland magnetic propertiesof Ho2 AlFe16 x Mnx( x= 0 8) compoundshave been in vestigated by means of x ray diffraction and magnetization measurements. Thecompoundshave a hexagonal Th2 Ni17 typestructure. With increasing x,the unit cell volumes have a smallincreaseinitially,followed by a greaterlinearincrease. The Curietemperatureandthe saturation magnetization of these compounds show marvelous drop with increasing x. The valuesofJRTofthecompoundsfor x =2 ,3 , and 4 are given.
关键词:
unit cellvolume
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null
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null
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null
Journal of Alloys and Compounds
Pseudo-1-3 magnetostrictive particulate composites consisting of light rare earth (Sm and Nd)-based magnetostrictive Sm(1-x)Nd(x)Fe(1.55) particles with the Nd content x of 0-0.56 and randomly distributed sizes of 10-180 mu m membedded and aligned in a passive epoxy matrix are fabricated using the particulate volume fraction of 0.5. The quasistatic magnetomechanical properties of the composites are investigated and the results are compared with their monolithic alloys for various x. The composites exhibit similar qualitative trends in properties with the alloys for all x. The Sm(0.92)Nd(0.08)Fe(1.55) composite shows a large unsaturated magnetostriction lambda of -530ppm at 500 kA/m and a high piezomagnetic coefficient d(33) of -2.0 nm/A at 100 kA/m as a result of the magnetocrystalline anisotropy compensation between Sm(3+) and Nd(3+) ions in the Sm(0.92)Nd(0.08)Fe(1.55) alloy. (C) 2011 Elsevier B.V. All rights reserved.
关键词:
Light rare earths;Magnetocrystalline anisotropy;Magnetomechanical;properties;Negative magnetostriction;Magnetostrictive composites;Sm(1-x)NdxFe(1.55) alloys;terfenol-d
Journal of Alloys and Compounds
Stabilizer (B, Co)-free, light rare earth (Pr)-substituted Laves alloys (Tb(0.3)Dy(0.7))(1-x)Pr(x)Fe(1.55) (0 <= x <= 0.4) are synthesized, and their structural, magnetic, and magnetostrictive properties are investigated. X-ray diffraction analysis confirms the presence of single cubic Laves phase with an MgCu(2)-type structure in the (Tb(0.3)Dy(0.7))(1-x)Pr(x)Fe(1.55) alloys with 0 <= x <= 0.35. The lattice parameter a of the Laves phase increases, while the Curie temperature decreases, with increasing x from 0 to 0.35. The saturation magnetization of the alloys decreases with increasing x. The linear anisotropic magnetostriction lambda(a) (=lambda(parallel to) - lambda(perpendicular to)) shows a maximum of 1502 ppm at x = 0.25 as a result of the magnetocrystalline anisotropy compensation. (C) 2008 Elsevier B.V. All rights reserved.
关键词:
Alloys and compounds;Laves phase;Light rare earths;Magnetocrystalline;anisotropy;Magnetostriction;Terfenol-D;anisotropy compensation;boron
Journal of Physics D-Applied Physics
Pseudo-1-3 magnetostrictive composites consisting of stabilizer ( B, Co)-free, light rare earth (Pr)-containing magnetostrictive (Tb(0.3)Dy(0.7))(1-x) Pr(x) Fe(1.55) (0 <= x <= 0.4) particles with a size distribution of 10-300 mu m embedded and aligned in a passive epoxy matrix using 0.5 volume fraction are fabricated. The quasistatic magnetomechanical properties of the composites are investigated and compared with their monolithic (Tb(0.3)Dy(0.7))(1-x) Pr(x) Fe(1.55) alloys, as a function of the Pr content x. The composites show similar qualitative trends in properties with the alloys for all x. The (Tb(0.3)Dy(0.7))(0.75)Pr(0.25)Fe(1.55) composite and alloy exhibit the smallest coercivity H(c), the largest magnetostriction lambda and the highest piezomagnetic coefficient d(33) due to the successful compensation for magnetocrystalline anisotropy. The ( Tb0.3Dy0.7) 0.75Pr0.25Fe1.55 composite demonstrates a large saturation magnetostriction lambda(s) of 793 ppm at 700 kAm(-1) and a high d(33) of 3.2 nmA(-1) at 140 kAm(-1). These values approach 81% and 85% of its alloy values at the same field levels. The good properties make the (Tb(0.3)Dy(0.7))(0.75)Pr(0.25)Fe(1.55) composite and alloy a promising magnetostrictive material system.
关键词:
terfenol-d;magnetic-properties;alloys;boron
Journal of Materials Research
The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.
关键词:
room-temperature
Journal of Magnetism and Magnetic Materials
The structure, magnetic and magnetostrictive properties of Sm(0.88)Nd(0.12)(Fe(1-x)Co(x))(1.93) (0 <= x <= 1.0) alloys have been investigated. The alloys have the cubic MgCu(2) structure over the whole composition range and the lattice parameter a decreases with increasing x. For 0 <= x <= 0.2, substitution of Co for Fe slightly increases the saturation magnetization M(s) and Curie temperature T(c), while further substitution causes a decrease in both M(s) and T(c). The spin reorientation is observed, and a phase diagram for the spin configurations of the Sm(0.88)Nd(0.12)(Fe(1-x)Co(x))(1.93) system is determined. The spontaneous magnetostriction lambda(111) increases as x is increased, while a monotonic decrease of the saturation magnetostriction lambda(s) with x originates from the increase of lambda(100) with opposite sign to that of lambda(111), which may be caused by the filling of the d band due to Co substitution. (C) 2010 Elsevier B.V. All rights reserved.
关键词:
Laves phase;Spin reorientation;Magnetostriction;giant magnetostriction;phase-compounds;temperature-dependence;anisotropy;substitution;alloys;fe
