The solid state reaction of Al/CuO induced by high-energy ball milling was studied systematically. When the amount of Al was 20 wt%, only reduction occurred. When the amount of Al exceeded 20 wt%, along with the reduction, a synthesis reaction occurred simultaneously. As the amount of Al ncreased, the reaction products were Cu Al, CuAl or a Al(Cu) solid solution, respectively. The 9 4 2 mechanism of these two types of reactions occurring during ball milling is discussed.

测定了高频淬火后经不同温度回火的1Cr12Ni2W1Mo1V钢试样在不同腐蚀环境以及有外加应力作用下的点蚀电位。结果表明，1Cr12Ni2W1Mo1V钢的点蚀萌生不仅与材料的热处理工艺、微观组织以及腐蚀环境有关，而且与外加应力有很大的关系。点蚀电位Eb随氯离子浓度CCl-增大而降低，且Eb与logCCl-呈直线关系。对于高频淬火+低温回火试样，在一定氯离子浓度（4.373mol/LCl-），pH值对点蚀电位影响不大；而对调质试样，pH值对Eb影响较大。高频淬火后试样的点蚀电位随外加应力变化可分为三个区：在应力小于50MPa时，点蚀电位随应力增加而急剧下降；在50～400MPa范围，点蚀电位随应力增加而缓慢减小；当应力大于400MPa时，点蚀电位基本趋于稳定。在此基础上提出了1Cr12Ni2W1Mo1V钢在外加应力作用下的钝化膜破裂机理。

The tungsten heavy alloys with the composition of 93W-4.9Ni-2.1Fe in weight percent from the elemental powders ofW, Ni and Fe were mechanically alloyed (MA-ed). Nano-crystalline supersaturated solid solutions with grain size of 11 nm, and amorphous phase were achieved during MA. By using a combination of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and energy-dispersive X-ray (EDX) analysis, phase transformation and thermal stability of mechanically alloyed 93W-4.9Ni-2.1Fe alloys were investigated. The results show that the melting point of 93W-4.9Ni-2.1Fe alloy milled for 60h decreases approximately by 220℃ compared with the unmilled powderd mixture. When sintered at 1150℃ for 30 min, tungsten heavy alloys using mechanically alloyed powders show homogeneous microstructure and ultra-fine tungsten particles of approximately 2m with high density above 95%. The matrix of tungsten heavy alloys, sintered at 1280℃ for 30 min using MA-ed powders, shows high W solubility about 63.72 wt.% with a large amount of volume fraction of about 0.5 of matrix.

Two SnO2+RuO2/Ti anodes with high SnO2-concentrations were prepared by painting, sintering and annealing through a sol2gel technique. The microstructure, morphology and grain size of coatings and the electrochemical properties of the anodes were investigated by XRD, DTA, SEM, TEM and CV. It is demonstrated that the anodic coatings consist of solid solution (Sn, X)O2 (X represents Ru or Ti) phases. The average grain size of the coatings is about less than 30nm. When the annealing temperature increases from 450℃ to 600℃, the solid solutions decompose. The crystal of the coating is equiaxial. The morphol-ogy of TiO2+SnO2/Ti coatings is a mixture of mud2flat cracking with a kind of agglomerated structure.