材料期刊网

AA6061-T6合金搅拌摩擦焊搭接接头的腐蚀性能评价

Farhad GHARAVI , Khamirul A MATORI , Robiah YUNUS , Norinsan K. OTHMAN , Firouz FADAEIFARD

中国有色金属学报(英文版) doi:10.1016/S1003-6326(16)64159-6

采用氯化钠+过氧化氢溶液浸泡试验研究AA6061-T6铝合金搅拌摩擦焊搭接接头的腐蚀行为。采用循环动电位极化测试、扫描电子显微镜和能谱仪表征腐蚀形貌，揭示焊接区与基体合金的腐蚀机理。研究了焊接接头的显微组织和剪切强度。结果表明，与基体合金相比，焊接区在腐蚀溶液中会发生晶间腐蚀和点蚀。搭接剪切测试结果...

关键词: 搅拌摩擦焊 , 搭接接头 , AA6061合金 , 点蚀 , 焊接过程 , 金属间化合物

Bi-Sr-Ca-Cu OXIDE SUPERCONDUCTOR WITH ZERO RESISTANCE TEMPERATURE 85.3K

SHI Fan ZHOU Shouzeng SHI Zhenhua LI Fubiao Beijing University of Science and Technology , Beijing , China Department of Materials Sicence and Engineering , Beijing University of Science and Technology , Beijing , China

金属学报(英文版)

The Bi-Sr-Ca-Cu-O suterconducting ceramics with T_c(onset)=112K, T_c(R=0)=85.3 K were prepared by quenching process.The Meissner effect of the sample appears at about 84.0 K....

关键词: superconductivity , null

Large magnetoresistance over an entire region from 5 to 380 K in double helical CoMnSi compound

Journal of Physics D-Applied Physics

A large magnetoresistance (MR) is observed in a double helical CoMnSi compound over the entire temperature region from 5 K to the maximum measuring temperature of 380 K, with the largest MR ratio of -18.3% at 245 K...

关键词: giant magnetoresistance;magnetic-structure;crystal;metals

Tuning Magnetic Properties of alpha-MnO(2) Nanotubes by K(+) Doping

Journal of Physical Chemistry C

alpha-K(x)MnO(2) nanotubes with x = 0.10, 0.12, 0.15, and 0.17 have been synthesized through acid and alkali treatments of the precursor alpha-MnO(2) nanotubes. For the samples with x = 0.10 and 0.12, a large divergence of the ZFC and FC susceptibilities and pronounced...

关键词: hydrothermal synthesis;manganese-dioxide;hollow urchins;tunnel;phase;transitions;nanowires;growth;oxides

La0.85K0.15MnO3多晶纳米颗粒磁制冷材料的制备

李丽荣 , 赵娟 , 王贵

金属功能材料

采用非晶态多核配合的方法在800℃制备出La0.85K0.15MnO3纳米颗粒,用XRD、HRTEM和PPMS等手段对纳米颗粒的微观结构和磁性能进行研究.XRD和ED分析表明,所有样品都具有单相钙钛矿结构;样品的M-丁曲线研究结果表明,L...

关键词: 居里温度 , 纳米颗粒 , La0.85K0.15MnO3

The corrosion behavior of four commercial steels in reducing atmospheres containing HCl at 773-873 K

Oxidation of Metals

The corrosion of four Fe-Cr commercial steels with different tents in a simulated waste-gasification atmosphere containing 0.5 vol.% H-2, 0.5 vol.% HCl, balance CO2 has been investigated at 773 and 873 K. The same materials have also been tested in the same gas mixture...

关键词: Cr steels HCl;reducing atmosphere;corrosion;high-temperature corrosion;fe-cr alloys;hydrogen-chloride;chromium-alloys;gas-mixtures;oxygen;800-degrees-c;oxidation;metals;fuels

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

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 ...

关键词: room-temperature

The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K

Nanoscale Research Letters

The linear thermal expansions (LTE) of bulk nanocrystalline ingot iron (BNII) at six directions on rolling plane and conventional polycrystalline ingot iron (CPII) at one direction were measured from liquid nitrogen temperature to 300 K. Although the volume fraction of...

关键词: Linear thermal expansion;Bulk nanocrystallined materials;Severe;rolling technique;electrochemical corrosion behavior;different grain sizes;microstructure;diffraction;selenium;metals

30 K单级高频同轴脉冲管制冷机

荀玉强 , 杨鲁伟 , 蔡京辉 , 梁惊涛 , 周远

工程热物理学报

介绍了一套实用型单级高频同轴脉冲制冷机工作在深低温区的性能特性.输入功率为200 W时,冷头无负荷最低温度可达到29.35 K,输入功率为235 W时,冷头无负荷温度可稳定在28.55 K....

关键词: 脉冲管制冷机 , 高频 , 单级 , 同轴 , 双向

Thermoelectric Characterization of (Na1-yMy)1.6Co2O4 (M=K, Ca, Sr)

Ying LI

材料科学技术（英文）

Oxide materials NaCo2O4 and (Na1-yMy)1.6Co2O4 (M=K, 0.05≤y≤0.35; M=Ca, Sr, 0.10≤y≤0.40) were prepared by a sol-gel method. Experimental results indicated that the Seebeck coefficient and the Power-factor of Na Co2O4 were improved by doping Ca and Sr but not by

关键词: Thermoelectric materials , materials , Electric , proper