材料期刊网，材料期刊，材料类期刊，材料期刊投稿

Fe-N thin films were fabricated on both 100Si and NaCl substrates by RF magnetron sputtering under low nitrogen partial pressure. The microstructure and magnetic properties of Fe-N thin films were investigated with the increase of the substrate temperature (Ts) and the annealing temperature (Ta). It is more difficult for nitrogen atoms to enter the Fe lattice under higher Ts above 150℃. The phase evolution is visible at higher Ta above 200℃. The phase transformation of α''-Fe16N2 occurred at 400℃. The change of crystal size with Ta was clearly visible from bright and dark field images. The clear high-resolution electron microscope (HREM) images of 110α, 111γ', 112α'', and 200α'' phases were observed. The interplanar distances from TEM and HREM match the calculated values very well. From the results of the vibrating sample magnetometer (VSM), the good magnetic properties of Fe-N films were obtained at 150℃ of Ts and 200℃ of Ta, respectively.

关键词: Fe-N thin film , null , null , null

Preparation of Li-B alloy and study of its microstructure and discharge characteristics

Zhijian LIU , Zhiyou LI , Wei DUAN , Xuanhui QU , Baiyun HUANG , Siqi ZHANG

材料科学技术（英文）

A LI-B alloy has been prepared using a pretreated amorphous B powder and pure Li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated. Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the Li7B6 would be more finery distributed in the metal Li by means of intensified stirring. The discharge characteristic of the Li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B.

关键词:

Effect of Li and Ti Additions on L■α(Al)+Mg_2Si Pseudobinary Eutectic Reaction

Shengxu ZHAO , Shunpu LI , Deqian ZHAO , Mingxiang PAN and Xichen CHEN(Institute of Physics , Chinese Academy of Sciences , Beijing 100080 , China)

材料科学技术（英文）

Effect of Li and Ti additions on Lα(AI)+Mg2Si pseudobinary eutectic reaction in ternary Al-Mg-Si system has been investigated by thermoanalysis, directional solidification and metallographic techniques in this study. It has been found that Li addition causes decreasing of the volume fraction of Mg2Si, while a little amount of Ti causes to increasing, which is of a great importance to the adjustment of phase constitution and alloy properties. Doping components have little influence on the eutectic temperature.

关键词:

Li-B合金的制备及反应机制研究

许小静 , 段柏华 , 曲选辉 , 罗远辉

稀有金属材料与工程

通过对合成装置的温控、散热、搅拌桨叶片等进行有效改进,获得了300 g/炉的制备规模,制备出的合金性能均匀一致,其密度及抗拉强度分别为0.870 g/cm3,12.61 Mpa.同时,根据反应合成现象及XRD结果,分析了Li-B合金的反应机制及其动力学过程.

关键词: 热电池 , Li-B合金 , 阳极材料 , 制备 , 反应机制

L12-Al3Li金属间化合物点缺陷浓度的第一原理计算

孙顺平 , 李小平 , 于赟 , 卢雅琳 , 臧冰 , 易丹青 , 江勇

中国有色金属学报

运用第一原理平面波赝势方法计算L12-Al3Li金属间化合物点缺陷的形成焓,并结合Wagner–Schottky模型,研究L12-Al3Li金属间化合物在523、673、823和1000 K时点缺陷浓度与成分之间的关系.结果表明:在这4个温度下,L12-Al3Li金属间化合物中Al空位浓度最小,Li空位浓度次之,Al反位和Li反位的缺陷浓度较大.Al反位和Li反位缺陷浓度在理想金属间化合物Al3Li化学计量比成分处基本相同,不过两种反位的缺陷浓度随着合金成分相对于化学计量比成分的偏离而变化显著,在富Al端Al反位缺陷浓度较大,在富Li端Li反位缺陷浓度较大.运用Arrhenius方程计算点缺陷的有效形成焓,结果显示Al反位和Li反位的有效形成焓较小且基本相同,Li空位次之,Al空位最大.

关键词: Al3Li金属间化合物 , 第一原理计算 , 点缺陷浓度 , 形成焓 , Wagner–Schottky模型

热电池阳极Li-B合金放电前后的微观特征

刘志坚 , 段伟 , 黄英华 , 李志友 , 曲选辉

功能材料

使用扫描电子显微境对放电前后的Li-B合金的微观特征进行了观察,对影响Li-B合金放电稳定性的主要因素进行了分析.结果表明,轧制后的Li-B合金为塑性好的Li包裹脆性的LiB粒子,在520℃放电后Li-B合金与电解质界面依然完整,在大电流(200mA/cm)短时间(12min)放充电后,金属锂被LiB和电解质分割,表现在断口上金属锂为细丝状.

关键词: 热电池 , Li-B合金 , 阳极

热电池阳极材料Li-B合金的密度分析

刘志坚 , 曲选辉 , 李志友 , 黄伯云

中国有色金属学报

根据LiB化合物的六方结构模型，计算了热电池阳极材料Li-B合金随B含量变化的理论密度曲线。采用阿基米德方法分别测量了含24%(摩尔分数)B的Li-B合金反应完全并经冷挤压后的样品和未经第二次放热反应中间样品的密度，综合分析了以往不同研究者所测量的结果。结果表明，反应充分并消除合金中孔隙后合金的实验密度值与理论计算值一致，以往造成实验偏差的主要原因是样品中存在孔隙。中间样品的密度与Li-B元素混合计算密度一致，它支持在第一次反应和第二次反应之间B熔化在Li中的观点。

关键词: Li-B合金 , 阳极 , 热电池 , 密度