Z.F.Peng1)
,
Y.Y.Ren1)
,
Q.S. Mei1)
,
Y.Q.Wang2)
,
X.Y.Zhang2) and M.S.Ye2) 1) Department of Materials Engineering
,
Wuhan University of Hydraulic and Electric Engineering
,
Wuhan430072
,
China 2) Department of Superalloys
,
CentralIron and Steel Research Institute
,
Beijing430072
,
100081 China
金属学报(英文版)
Theeffectsof Nband Ti+ Nb microalloyingon mechanicalpropertiesand rupturelifeunder900 ℃ tensiletest on alloy GH652 were studied. Among theoriginalalloy GH652 and its Nb/ Ti+ Nb microalloyed alloys, the Ti+ Nb microalloyed alloy exhibited optimum com bined900℃ tensilestrength and plasticity and longer 900℃ 49 MPa prolonged tensile rup turelife as well. The role of refractory alloying elementscould be effectively brought intoplay with highertemperaturesolution treatment. Coordination strengthening of Matrix andgrain boundary wasthekeyfactoroflifetimeextension andthe mobilityof dislocationsinthematrix wasresponsableforthe plasticity ofthe micro alloyedsamples.
关键词:
GH652 Nb/ Ti+ Nb micro alloying
,
null
,
null
,
null
Applied Physics Letters
The effect of nonmagnetic Y partial substitution at the Dy site in Dy(1-x)Y(x)MnO(3) up to x=0.2 on magnetism, specific heat, and ferroelectricity is investigated, which resulted in a preliminary multiferroic phase diagram. It is revealed that the Y partial substitution suppresses the Dy-spin ordering point (T(Dy)) and ferroelectric ordering point (T(FE)) but enhances the Mn-spin ordering point (T(N)). The interaction between the spins of Dy and Mn is remarkably affected by Y substitution. The measured electrical polarization depends on the Y substitution in a complex way because the ferroelectricity is sensitive to the interaction between the spins of Dy and Mn. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3536506]
关键词:
ferroelectricity;polarization
王桂英
,
唐永刚
,
毛强
,
郭腾
,
刘宁
,
彭振生
稀有金属
doi:10.13373/j.cnki.cjrm.2014.03.007
用固相反应法制备了Y1-xDyxCrO3(z =0,0.1)多晶样品.通过X射线衍射(XRD)图谱检测了样品的结构,测量了样品的磁性,作了磁化强度-温度(M-T)曲线、磁化强度-磁场(M-H)曲线,研究了Dy3替代Y3+对Y1-xDyxCrO3体系磁性质的影响.结果表明,Dy3替代多铁性YCrO3中的Y3+对YCrO3的磁性有效大影响.YCrO3在奈尔温度TN=139 K以下呈倾角反铁磁,显示弱铁磁性;Dy3+替代y3+后的Y0.gDy0.1CrO3样品,在50 K＜T＜142K温区,少量Dy3+在两相邻Cr3+产生的倾角反铁磁内场作用下沿内场反方向排列,使铁磁性减弱;在T＜50 K温区,Dy3+-O2--Dy3+层的铁磁性与Cr3+-O2--Cr3+层的铁磁性耦合,铁磁性增强.
关键词:
多铁性材料
,
Dy替代
,
磁性质
史伟
,
王天新
,
王顺花
,
石宗利
兵器材料科学与工程
doi:10.3969/j.issn.1004-244X.2009.05.017
通过金相分析、扫描电镜等测试手段,对含有1%稀土Y元素的AM50和AZ91镁合金的微观组织和腐蚀性能进行研究,结合镁合金的腐蚀形貌,分析对比两种镁合金在相同腐蚀条件下的腐蚀机理.结果表明,由于两种镁合金成分上的差异,使得AM50-1Y较AZ91-1Y在实验室所采取的腐蚀条件下具有不同的耐腐蚀性能.
关键词:
AM50镁合金
,
AZ91镁合金
,
稀土Y
,
腐蚀
Chinese Physics Letters
Magnetic properties of spin-ladder compounds Sr(14)(Cu(1-y)Fe(y))(24)O(41) (0 <= y <= 0.05) are investigated in the temperature range from 10 to 300 K. The result reveals that all the samples exhibit magnetic crossover behavior in the paramagnetic range, and Fe(3+) doping can efficiently increase the susceptibility due to the large moment of Fe(3+). Both the observations are consistent with our previous investigation on transport behaviors, indicating the strong correlation between the magnetism and transport behaviors. The spin gap is evidenced in all the samples, and strengthens as Fe(3+) doping level increases, which can be associated with the antiferromagnetic interaction between Fe(3+) and Cu cations.
关键词:
metal-insulator-transition;material sr14cu24o41;cuo2 chains;superconductivity;dynamics;state;gap;nmr;sr14-xcaxcu24o41;interplay
Journal of Alloys and Compounds
(Ca(1-x-y),Ln(y))MoO(4): xEu(3+) (Ln = Y, Gd) red phosphors were prepared by co-precipitation method with NH(4)HCO(3)-NH(3)center dot H(2)O system as the precipitating agent. X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), and energy-dispersive X-ray spectrometer (EDS) were used to characterize the structure and composition of the phosphors. The synthesized (Ca(1-x-y),Ln(y))MoO(4): xEu(3+) have scheelite structure with pure phase. FT-IR spectra show strong absorption peaks between 914 and 730 cm(-1) which are assigned to the vibration of O-Mo-O in MoO(4)(2-) tetrahedron. The EDS analysis reveals that the red phosphors have been successfully prepared by co-precipitation method according to theoretic ratio. Photoluminescence spectra show a red emission around 614 with 394 and 464 nm excitation, which is match well with the output wavelength of commercial ultraviolet and blue LED chips. The luminescent intensity of (Ca,Ln)MoO(4): Eu(3+) is obviously higher than that of CaMoO(4): xEu(3+). Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
关键词:
Co-precipitation;Red phosphor;Photoluminescence;(Ca(1-x-y),Ln(y))MoO(4): xEu(3+) (Ln = Y Gd);hydrothermal synthesis;camoo4;eu3+;luminescence
方西亚
,
易丹青
,
王斌
,
罗文海
,
顾威
稀有金属
doi:10.3969/j.issn.0258-7076.2006.06.002
在Mg-6Al-1Zn合金的基础上添加不同质量分数的Y(分别为0%,0.5%,0.9%,1.4%),制备了4种实验合金,研究了Y的添加对合金组织性能的影响.通过X射线衍射、金相显微镜、扫描电镜、电子探针等手段分析了Mg-6Al-1Zn合金添加Y后组织结构的变化.研究结果表明,添加了不同含量Y的合金中都出现了一种新相Al2Y相.随着Y含量的增加,Al2Y相数量增多而Mg17Al12相则减少.Y能细化合金铸态及挤压态显微组织,其细化作用在添加了0.9%Y的镁合金中尤为明显.铸态合金室温拉伸试验表明:该合金具有最佳的综合力学性能.当Y含量添加至1.4%时,Al2Y相变得粗大且出现团聚现象而导致了拉伸性能的下降.经过挤压后,合金的力学性能大幅度上升.
关键词:
Mg-6Al-1Zn-Y合金
,
显微组织
,
力学性能
Ieee Transactions on Magnetics
The spin orientation and spontaneous magnetostriction of multicomponent TbxDy1-x-yPry(Fe0.9B0.1)(1.93) (0.10 less than or equal to x less than or equal to 0.25, 0.30 less than or equal to y less than or equal to 0.60) Laves phases were studied by step-scanning their (440) X-ray diffraction lines. The easy magnetization direction (EMD) of the Laves phases changed from the (100) to (111) axis when x was increased from 0.10 to 0.25. With increasing y, the EMD of Tb0.15Dy0.85-yPry(Fe0.9B0.1)(1.93) and Tb0.2Dy0.8-yPry(Fe0.9B0.1)(1.93) Laves phases reoriented from the (100) to (111) axis. The magnetostriction coefficient lambda(111) of TbxDy1-x-yPry(Fe0.9B0.1)(1.93) Laves phases increased with increasing x (or y) when y (or x) was kept constant.
关键词:
Laves phases;magnetostriction;spin orientation;X-ray diffraction;anisotropy compensation;alloys
白力静
,
张珊
,
金永中
,
殷鹏
,
王志虎
稀有金属
利用多靶非平衡磁控溅射离子镀技术制备不同Y含量的CrxAlyY1-xAlY1-xN(x=0.88,0.89,0.86,0.83,0.703;y=0.12,0.083,0.077,0.071,0.057,下同)镀层,通过镀层的氧化动力学曲线,结合镀层形貌及相结构的变化,研究Y含量对CrxAl1-xY1-x-yN镀层热氧化行为的影响.结果表明:适量的Y可提高镀层的热稳定性,相对无Y的Cr0.88Al0.12N镀层,Y含量为3.28at％的Cr0.86Al0.077Y0.063N镀层氧化过程缓慢,动力学曲线变化平缓,900℃时镀层氧化增重量仅为无Y镀层的14％,且表面出现大量氧化物堆积,但没有出现氧化孔洞,断口形貌没有明显分层现象;但Y含量过多时,仅能维持镀层低温阶段的平稳,当温度超过900℃,Y含量为12.88at％的Cr0.703Al0.057Y0.24N镀层则加速氧化,出现线性上升的趋势,镀层严重氧化开裂;适量Y元素的添加,在镀层加热过程中可钉扎晶界,减小氧化过程中内应力的释放,提高了镀层的热氧化性能.而Y含量增多,镀层由固溶态转变为YN相,氧化过程中会阻止亚稳态(y-,θ-)Al2O3向稳态(α-)Al2O3的转变,从而形成多孔氧化膜,且大尺寸Y2O3在晶界的偏聚,增加O原子扩散通道,加速了镀层的氧化.
关键词:
磁控溅射
,
CrxAlyY1-x-yN
,
氧化
,
Y
