材料期刊网

Mg,RE复合微合金化提高Ni_3Al(B)-Cr基合金的室温塑性

徐颂波 , 陈俊明

金属学报

研究了由γ＋γ＇相组成的Ｎｉ３Ａｌ（Ｂ）－Ｃｒ基合金在Ｍｇ，ＲＥ复合微合金化后的室温拉伸性能。发现Ｍｇ，ＲＥ的微合金化并不降低合金的屈服强度，但明显细化其γ＇相，其形态也由粗大的块状转变为均匀的球状。合金的延伸率提高了约２０％。

关键词: Ｎｉ_３Ａｌ（Ｂ）－Ｃｒ基合金 , multi-microalloying , γ＋γ＇phases , room temperature ductility , Mg , rare earth elements

EFFECT OF RARE EARTH ON VANADIZATION PROCESS IN BORAX BATH

X.K. Tao , X.Cong , R.S. Peng , J.Liu and Z.Y. Liu Tianjin Institute of Technology , Tianjin 300191 , China

金属学报(英文版)

This paper investigates the effect of rare earth elements on the kinetic process, microstructure and mechanical properties of vanadization in borax bath. The results show that addition of rare earth elements to vanadizing agent has obvious catalytic effect on the rate of vanadization, which has been enchanced by 30%. The wear and corrosion resistance of vanadium carbide layer were prompted by the addition of rare earth to the agent. Through increasing vanadium potential of the agent, activating the surface of workpieces and decreasing the activation energy of diffusion of carbon, rare earth elements accelerate the rate of vanadization process.

关键词: rare earth elements , null , null

Rare earth elements in tropical surface water, soil and sediments of the Terengganu River Basin, Malaysia

稀土学报(英文版) doi:10.1016/S1002-0721(08)60391-9

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Geochemistry of rare earth elements in cobalt-rich crusts from the Mid-Pacific M seamount

稀土学报(英文版) doi:10.1016/S1002-0721(08)60214-8

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Effect of Low Concentration of Yttrium on Physiological Characteristics of Cucumber (Cucumis Sativus L.)

稀土学报(英文版)

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Effect of Low Concentration of Yttrium on Physiological Characteristics of Cucumber (Cucumis Sativus L.)

稀土学报(英文版)

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Global rare earth resources and scenarios of future rare earth industry

稀土学报(英文版) doi:10.1016/S1002-0721(10)60401-2

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基于GIS的离子型稀土堆浸尾矿区稀土分布研究

潘洋 , 冯秀娟 , 马彩云 , 朱易春 , 张素贞

稀土 doi:10.16533/J.CNKI.15-1099/TF.201503002

以赣县风化壳淋积型稀土堆浸尾矿为研究对象,研究尾矿区土壤中稀土元素的含量及分布状况.采用地统计分析方法研究土壤中稀土含量分布空间变异性,并用克里金法(Kriging)进行空间插值作图.实验结果表明,土壤中稀土含量变异系数都属于中等变异强度以上,其中La元素的变异强度最大,变异系数为170％.空间分布上,Yb的空间相关性较强,La元素的空间相关性最差,其他稀土元素属于居中程度.插值结果显示,土壤中La质量由北到南成阶梯状逐渐减少,其余稀土元素分布情况大致相似,由西北方向到东南方向逐渐增加.

关键词: 土壤 , 堆浸工艺 , 稀土元素 , 空间分布

电感耦合等离子体质谱法测定砂金中稀土元素

李予晋 , 周燕 , 王铁夫 , 张延洁

黄金

建立了砂金中15种稀土元素的电感耦合等离子体质谱测定方法.考察了基体 Au 的谱线干扰及基体效应,采用 In 内标补偿基体对待测信号的抑制作用.仪器检测限为0.0009~0.0029μg/L,加入标准物质的回收率为98%~106.7%,分析结果的相对标准偏差(RSD)为0.33%~1.79%.该方法简单、快速、灵敏、准确.

关键词: 电感耦合等离子体质谱法 , 砂金 , 稀土元素 , 内标法

Rare earth element (REE) geochemistry of phosphorites of the Sonrai area of Paleoproterozoic Bijawar basin, Uttar Pradesh, India

稀土学报(英文版) doi:10.1016/S1002-0721(12)60081-7

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