Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m-2 min-1 at room temperature,an order of magnitude larger than any previously reported value. The activation energy of the degradation process was calculated according to the Arrhenius equation,and a much lower value than those previously reported was obtained. Valence band measurement indicated that a depressed valence band maximum and a widened empty band were established in the amorphous ribbon. The unique structure of the amorphous alloy is important-it may reduce the activation energy of the degradation process and enhance the activity of the electrons,thus accelerating the degradation process.     

Effect of Si on austenite stabilization,martensite morphology,and magnetic properties in Fe-26%Ni-x%Si alloys

The effect of Si on the austenite stabilization, martensite morphology, and magnetic properties in Fe-26%Ni-x%Si (x=3.5, 5, and 6) alloys have been studied by means of transmission electron microscopy (TEM) and M?ssbauer spectroscopy techniques. TEM observations reveal that the martensite morphology is closely dependent on the Si content. The volume fraction changes of martensite and austenite phases, the hyperfine magnetic field, and isomer shift values have been determined by Mssbauer spectroscopy. The M?ssbauer study reveals that the hyperfine magnetic field, the isomer shift values and the volume fraction of martensite decrease with increasing Si content.     

Fe—Cr—Ni三元合金电镀初探

本文研究在氯化物电解液中制备类似18-8不锈钢成份的 Fe Cr-Ni 三元合金镀层。采用这种工艺规范所得到的铁铬镍三元合金外观呈银白色,镀层铁铬镍含量分别是:58.0%～66.4%,19.5%～22.5%,14.4%～19.2%,还含有少量 Ti 等微量元素.镀层结合力良好,耐腐蚀符合不锈钢要求。     

快速冷凝粉末冶金技术制备Al-Li-Cu-Mg-Zr合金的研究

用快速冷凝技术制备了一种铝-锂合金的微细粉末,粉末体经冷压、真空去气、真空热压致密化,之后在400℃挤压成材。研究了这种合金在不同热处理条件下的显微组织和力学性能。与成份相近但用铸锭冶金方法制备的铝-锂合金相比,快速冷凝-粉末冶金方法制备的铝-锂合金,其硬度、强度较高,但塑性偏低。文章讨论了塑性偏低的原因以及改善合金塑韧性的可能途径。     

CuZnAl形状记忆合金的变形与断裂（Ⅰ）

扫描电镜动态拉伸试验发现，马氏体状态的ＣｕＺｎＡｌ形状记忆合金断裂之前经受了强烈的变形，裂纹于马氏体界面萌生和扩展，原母相晶界对裂纹的扩展起阻止作用，断裂后呈现微孔集聚型塑性断口。     

掺La_2O_3钼丝的显微组织与强韧化

以粉末冶金及金属压力加工方法制备了掺Ｌａ２Ｏ３钼丝和纯钼丝，采用金相显微镜、Ｘ射线衍射、电子拉伸机、扫描电镜及能谱分析等手段，对上述２种坯料及其不同温度退火后的丝材作了研究，结果表明，掺Ｌａ２Ｏ３改善了坯料的组织性能；掺Ｌ３２Ｏ３钼丝中的第二相主要是Ｌａ２Ｏ３粒子，它能显著改善钼丝的强韧性能。     

高温自润滑铁－铼合金电镀层

研究了用电镀法制取铁－铼高温自润滑合金的可能性。结果表明，电流密度，高铼酸根离子浓度等因素对镀层含铼量和阴极电流效率有较大影响，确定了较适宜的镀液组成和电镀条件。摩擦实验结果表明，铁－铼镀层有高温自润滑的作用，有希望代替整体冶炼的铁－铼合金。