Effect of Al-Y-Ce-La master alloy on structure formation, liquation processes and properties of AK7ch silumine (AL9)

The regularities of changes in the composition and properties (micro- and nanohardness, HB hardness) of the structural components - α-solid solution and eutectic components of the AK7ch alloy (AL9) depending on the value of the addition of Al-Y-Ce-La master alloy are established. With an increase in the addition of Al-Y-Ce-La master alloy a sharp change is observed in the composition and properties of the structural components of the AK7ch alloy - α-solid solution Si in aluminum and eutectic α + Si, as well as complex-doped aluminides from Si, Fe and rear earth metals (REM). The structural components of the AK7ch alloy are identified with the addition of an increasing amount of Al-Y-Ce-La master alloy (α-solid solution of Si in aluminum, eutectic α+Si, complex-doped aluminides of rare-earth metals of variable composition AlxSiyREMz and AlxSiyFezREMν). A correlation between the solubility of silicon in α-solid solution and its microhardness is found. To increase microhardness of the eutectic and hardness of the AK7ch alloy, it is necessary to add the synthesized ligature in the amount of 0.1 wt.%

Technology of obtaining REM-containing master alloy for silumins modification

The technology of producing ligatures containing rear earth metals (REM) for modification of silumins has been developed. The optimum content ratio of yttrium, cerium and lanthanum 2: 1: 0.5 (15-20 wt.% Y, 7-10 wt.% Ce, 3.5-5.0 wt.% La) for the synthesis of REM aluminides has been established. The peculiarities of the REM aluminides synthesis is studied using the methods of optical and electron microscopy and X-ray microanalysis, followed by the identification of the structural components of the Al-REM alloy. The microstructure of the master alloy is proved to consists of: REM aluminides (yttrium-containing and cerium-containing), metal base (Al), Al eutectic + REM aluminide and α + Si

Production of functional materials on the basis of tungsten multicomponent mineral resources

We produced tungsten and tungsten carbide as a result of the synthesis of multicomponent tungsten mineral resource with the employment of high density energy flow. The results of experiments concerned with the possibility of using high-density energy to synthesize functional materials for industrial use are presented as well

Production of functional materials on the basis of tungsten multicomponent mineral resources

We produced tungsten and tungsten carbide as a result of the synthesis of multicomponent tungsten mineral resource with the employment of high density energy flow. The results of experiments concerned with the possibility of using high-density energy to synthesize functional materials for industrial use are presented as well

SURFACE PLASTIC DEFORMATION OF ELECTRO-SPARK COATINGS

The research provides facts about the surface plastic deformation (SPD) effect on the coatings surface parameters formed by electro-spark alloying (ESA). The complex for nonabrasive ultrasonic finishing (NUF) was used as the installation for SPD. It was found out that when processing bronze by NUF several passes of indenter were needed to provide substantial decrease of the surface roughness parameters. The NUF effect on roughness parameters of intermetallic coatings on steel 20X13 was studied. NUF proved to be perspective when it is necessary to reduce the number of transverse cracks in the coatings formed by ESD method. In order to assess the efficiency of coating surface treatment by NUF method the use of additional parameters Rk, Rpk, Rvk alongside with Ra are recommended as they allow assessing the resulting surface as triple. It is found out that the number of passes during the processing of intermetallic coatings should not exceed 6. For achieving maximum processing efficiency it is necessary to take into consideration the initial roughness value

NICKEL ALUMINIDE SYNTHESIS REINFORCED WITH MOLYBDENUM BORIDE COMPOSITE

The authors study obtaining a composite material NiAl - Mo2B5 while carrying out thermally coupled reactions of self-propagating high-temperature synthesis with a deoxidizing aluminothermal stage. The authors established ultimate and phase composition of the obtained composite. The microstructure is studied. It is shown that the composite consists of the intermetallic phase NiAl with Mo2B5 inclusions