B.X. Gu
,
J.R. Zhang
,
B.G. Shen and H Wang (Department of Physics
,
Nanjing University
,
Nanjing 210093
,
China)(State Key Lab. of Magnetism
,
Institute of Physics
,
Chinese Academy of Sciences
,
Beijing 100080
,
China)(Department of Physics
,
Southeastern University
,
Nanjing 210008
,
China)
金属学报(英文版)
The phase component and Curie tempemture of Nd4(Fe1-xCrx)77.5B18.5 (0 B phases in the samples with x < 0.1 and the presence of α-Fe, Nd2Fe14B and Fe2B phases in the samples with x > 0.1. The magnetic measurement shows that Curie temperutures of Fe3B and Nd2Fe14B phases decrease with increasing Cr content. The influence of the substitution of Cr for Fe was discussed.
关键词:
Nd_4(Fe_(1-x)Cr_x)_(77.5)B_(18.5)alloy
,
null
,
null
QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing
,
Beijing
,
China
金属学报(英文版)
The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.
关键词:
stress corrosion cracking
,
null
,
null
,
null
材料科学技术（英文）
Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was, studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydrogen permeation technique. The results reveal different cracking mechanism and H permeation current (I-H) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 steel in 5% NaCl solution with H2S was evaluated by the permeation current (I-H, mu A), which depends on the concentration (c x 10(-6)) of H2S by the equation: I-H = 8.525 x c(0.7249). It is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.
关键词:
cracking
叶建林
,
杨永福
,
巨建辉
,
董斌
中国材料进展
doi:10.3969/j.issn.1674-3962.2006.01.008
研究Incoloy 800H/20g复合板焊接工艺,以解决以镍基合金复合板材为主体的设备在焊接过程中易产生裂纹、气孔及成分偏析等问题.焊接实验选择H1Cr16Ni21作为过渡填充金属,采用惰性气体保护焊和手工电弧焊2种形式焊接.实验结果表明,选择H1Cr16Ni21作为过渡填充金属,采用小电流、多道次焊接工艺,可得到质量良好的焊缝,焊缝宽度、焊缝余高、咬边及焊接错边均符合JB4730-94标准要求;力学性能优于20g耐热钢,焊缝成分与Incoloy800H接近.成功地解决了成分差异较大的2种材料焊接时易出现裂纹和气孔的问题.
关键词:
Incoloy 800H/20g复合板
,
焊缝质量
,
焊接工艺
Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy
The optical band positions and EPR g factors (i =x, y, z) of Cu(H(2)O)(6)(2+) clusters in pure Tutton salts M(2)Cu(SO(4))(2)center dot 6H(2)O (M= NH(4), Rb) are calculated from the complete diagonalization (of energy matrix) method based on the cluster approach. In the calculation, the superposition model with the structural data is used to obtain the crystal-field parameters. The calculated results are in reasonable agreement with the experimental values, suggesting that the complete diagonalization method and superposition model are effective in the studies of optical and EPR data. The g factors g(i) of Cu(H(2)O)(6)(2+) clusters in Cu(2+) doped isomorphous diamagnetic Tutton salts M(2)Zn(SO(4))(2)center dot 6H(2)O are also studied from the same method. It is found that the approximately tetragonally compressed Zn(H(2)O)(6)(2+) octahedra in the host crystals change to the approximately tetragonally elongated Cu(H(2)O)(6)(2+) octahedra in the impurity centers. The causes concerning the Jahn-Teller effect are discussed. It appears that in some cases the octahedral environment of an impurity M(1) in crystals differs from that of the replaced host ion, but is close to the one in the isomorphous pure crystals where M(1) is the host ion rather than the impurity ion. (C) 2011 Elsevier B.V. All rights reserved.
关键词:
Electron paramagnetic resonance;Optical spectrum;Crystal- and;ligand-field theory;Tutton Salts;Cu(2+);atomic screening constants;gyromagnetic factor;scf functions;copper(ii);field;model;ions;spin
毕大森
,
武晋
,
张建
,
彭本栋
材料开发与应用
doi:10.3969/j.issn.1003-1545.2009.01.003
高强度烘烤强化(BH)钢是汽车覆盖件用的高强度钢板.本文通过试验对汽车用高强度钢板B180H1的力学性能、成形性能、烘烤硬化性能和抗凹陷性能进行了全面的研究,并与DC04钢板的各项性能进行了比较.使用NADDRG模型对B180H1钢的成形极限进行了预测.试验结果表明,B180H1的力学性能优于DC04,成形性能不低于DC04,且B180H1的烘烤硬化性能及抗凹陷性能方面均优于DC04.B180H1钢板的实冲壳体也具有良好的成形性能.
关键词:
汽车轻量化
,
高强度钢板
,
烘烤硬化
,
成形性能
,
抗凹陷性
