Texture evolution of TA15 titanium alloy during thermal compression deformation was studied by Gleeble--3500 thermal simulation machine and EBSD. The results show that there are significant changes in morphology and orientation of the primary a phase with increased strain rate during deformation： the equal axis shape of the grain is elongated to long strip shape in the direction perpendicular to the compression direction, orientation change region firstly forms in the grain, and then slip deformation occurs to some extent resulting in plastic deformation. At the same time, the strength of a phase texture weakens with increased strain rate, and the texture component is continually transformed from {1120}（1120） to {0001 } （1126）.

Micron diamond film was prepared by hot filament chemical vapor deposition on B212-typed YT15 carbide shaped milling blade,and then milling experiments were performed with 65% SiC particle reinforced aluminum-based composite as the specimen material. Compared with uncoated carbide tool, the coating effect of diamond film coated tool was evaluated. The results show that under the same milling conditions, each milling force of diamond film coated tool is reduced by 50%-65% compared with the uncoated tool. The diamond film exhibits a good adhesion strength on the matrix during milling. The coated tool with acid-alkali pretreatment is more suitable for roughing of the above composite,and the coated tool with alcohol-alkali pretreatment is more suitable for its semi-finishing. Besides, the workpiece surface quality obtained by continuous machining with the coated tool is better and more stable than that with the uncoated tool, and the shaped precision of the groove milled with the coated tool is increased by about 30 % compared with the uncoated tool.

Potassium content in tantalum powder was determined by flame atomic emission spectrometry, the flame conditions were optimized, and the reagent dosages were selected. The detection limit is 2. 375 μg/g of the above method for the potassium content in tantalum powder under the selected conditions,its standard addition recovery rate is 94.0%- 104.5%, and the relative standard derivation is not more than 7.31%. There is no significant difference on analytical results between the above method and the national standard analytical method of atomic absorption spectrometry.

The impurity contents of Ca, Mg and Mn in rare earth carbonate were determined with ICP-AES. The influence of matrix effect was overcome with the standard addition method. The factors affecting determination results were studied, the best analytical spectral lines and the acidity were determined. The detection limit of each element is 0. 003 040. 011 0 μg/mL,the recovery is between 92.85%-101.81%,and the relative standard deviation is between 3.3%- 5.0%. The method is rapid, accurate, convenient and practicable.

Study is made on the influences of direct acid leaching and black roasting-acid leaching on vanadium leaching behaviors of three kinds of carbonaceous shale from Xiushui or Pengzhe in Jiangxi province and Tongshan in Hubei province,respectively. The results show that under the conditions of leaching temperature 95 ℃ ,leaching time 4 h,mass ratio of liquid to solid 1 ： 1 ,volume fraction of H2SO4 15% ,mass fraction of CaF2 5 %,the vanadium leaching rates of three kinds of carbonaceous shale treated with direct acid leaching are 92. 39%, 74. 10%and 40. 53%, respectively, while the above leaching rates with black roasting-acid leaching are 85. 53%,90. 78% and 41.59%,respectively. It is found that both the existing forms of vanadium and iron in carbonaceous shale and the contents of acid-consumable minerals have great effects on vanadium leaching. By blank roasting, vanadium in organics can be transformed into free and soluble vanadium oxide, and mica-contained vanadium can be disintegrated to accelerate vanadium leaching. However,the acid-nonconsumable mineral of pyrite could be transformed into the acid-consumable mineral of hematite to hinder vanadium leaching. It is reasonable for the three kinds of carbonaceous shale in which vanadium exists mainly in the form of aluminosilicate including mica to adopt correspondingly different vanadium leaching processes. Direct acid leaching process is suitable for carbonaceous shale from Xiushui inJiangxi Province,blank roasting-acid leaching process is suitable for carbonaceous shale from Pengzhe in Jiangxi Province,and another vanadium extracting process should be adopted for carbonaceous shale from Tongshan in Hubei Province.

A new process was studied for the preparation of high-purity metal cerium with high-purity CeO2 as the raw material. The process of calcium-thermal reduction, vacuum melting,floating zone melting and solid-state electric migration is applied for preparation and refining of high-purity metal cerium,and the product has the relative purity of Ce/TREM≥99.99% and the absolute purity of 99. 961%. The process is applicable for the preparation of high-purity RE metallic reagent.

This paper presents a systematical study on a new process of tungsten recovery from tungsten slag. The tungsten leaching rate reaches more than 860/00 with 1% additive A,20% hydrochloric acid mass fraction, 100℃acid leaching temperature,3 h leaching time and 3 ： 1 liquid-solid ratio. Moreover,tungsten and other valuable metals could be well separated by ion exchange of weakly basic anion exchange resin and purification process. The process is characterized by reasonable product structure, high recovery, less inrcial operation and quick effect with very good industrial application prospect.

Volatile dust containing indium and other valuable metals is obtained by rotary kiln reduction vol atilization with blast furnace dust as the raw material. Indium ingot is produced through neutral leaching, two-stage acid leaching, extraction, stripping, metathesis reaction, electrolysis and casting process with total indium recovery up to 70 %. The process has been successfully used in the industrial practice with good economic benefit ,and its market prospect will be very broad.

After measurement of the resistance of molten salt with the AC impedance spectrum method,the electrical conductivity of Nd2O3-NdF3-LiF molten salt was tested by continuously varying cell constant （CVCC） technique. Meanwhile, the regression equations between the temperature, component of molten salt and its electrical conductivity were developed. The study is focused on the relations between the electrical conductivity and NdF3 content, and interaction between the ion concentration and the directional migration resistance of molten salt charge is analyzed. The results show that the electrical conductivity of the melt increases with the increase of temperature and LiF content,but decreases with increasing Nd2O3 and NdF3 content. At given temperature,the electrical conductivity of molten salt depends on the concentration of the ions and the resistance of directional migration of charge, especially on the resistance of directional migration of charge.

The main methods for preparing doped tungsten oxide are described, such as solid-phase method, liquid-phase method and gas-phase method. The advantages and disadvantages of these methods are summarized as well as their development prospect. Improvement effects of different element doping are analyzed on electrochromism performance, gas sensitivity and photocatalysis performance of tungsten oxide. And research direction for the functional properties of future doped tungsten oxide is proposed.