Specifics of personnel policy at the Kaesong Industrial Complex (DPRK)

В статье рассматриваются вопросы трудоустройства, условий труда и соблюдения прав северокорейских рабочих на Кэсонском промышленном комплексе в Республике Корея.The article addresses the issues of employment, working conditions and rights of North Korean workers at the Kaesong Industrial Complex (KIC) in the DPRK

STUDYING AMORPHOUS-CRYSTALLINE TRANSITIONS IN POWDERS CAUSED BY BALL-MILLING

The microstructure evolution during mechanical milling was studied in (Cu49Zr45Al6)100-x-yNixTiy (x = 0, 10; y = 0; 10) alloys. Homogenous, crystalline ingots were milled for 25 hours and amorphous or amorphous/crystalline powders were synthesized. The amorphous transformation depends on the composition of the alloys. In the case of Cu49Zr45Al6, 15 h of milling is sufficient to reach the full amorphization measured by XRD, which is enhanced by Ti and Ti-Ni alloying elements

Amorphization of CuZr based alloy powders by mechanical milling

The effect of nickel addition was studied in the CuZr system creating alloys with near eutectic composition. Nickel and aluminum have been regarded as useful elements to improve the plasticity, thermal stability of the CuZr-based amorphous alloys. Cu49Zr45Al6 and (Cu49Zr45Al6)95Ni5 were selected because of the good glass-forming ability. After 15 h of milling the structure of the powders was amorphous based on the XRD analysis. By adding nickel, the crystallization temperature (Tx) shifted to higher temperatures compared to CuZrAl alloy. The value of supercooled liquid region was 64 K, which means CuZrAl has a comparatively high glass forming ability. © (2014) Trans Tech Publications, Switzerland

Amorphization of CuZr based alloy powders by mechanical milling

The effect of nickel addition was studied in the CuZr system creating alloys with near eutectic composition. Nickel and aluminum have been regarded as useful elements to improve the plasticity, thermal stability of the CuZr-based amorphous alloys. Cu49Zr45Al6 and (Cu49Zr45Al6)95Ni5 were selected because of the good glass-forming ability. After 15 h of milling the structure of the powders was amorphous based on the XRD analysis. By adding nickel, the crystallization temperature (Tx) shifted to higher temperatures compared to CuZrAl alloy. The value of supercooled liquid region was 64 K, which means CuZrAl has a comparatively high glass forming ability. © (2014) Trans Tech Publications, Switzerland

Surface grain coarsening and surface softening during machining of ultra-fine grained titanium

Experiments are run to show that different machining conditions applied to ultra-fine grained pure titanium lead to different levels of grain coarsening and softening near the machined surface. Under “hard” machining conditions the upper 40 microns of the machined surface are altered with a decreased microhardness. The experimental results are reasonably reproduced by model calculations. Expanding the parameter field of the model calculations, the surface coarsening diagram and the surface softening diagram due to machining are presented, showing the region of technological parameters, under which neither grain coarsening nor softening takes place along the machined surface

The effect of rotating magnetic field on the solidified structure of Sn-Cd peritectic alloys

The peritectic alloys, such as some types of steel, Ni-Al, Fe-Ni, Ti-Al, Cu-Sn, are commercially important. In contrast to other types of alloys, many unique structures (e.g. banded or island ones) can form when peritectic alloys are directionally solidified under various solidification conditions. It can be observed in the course of the directional solidification experiments performed in a rotating magnetic field (RMF) that the melt flow has a significant effect on the solidified structure of Sn-Cd alloys. This effect was investigated experimentally for the case of Sn-1.6 wt% Cd peritectic alloy. For this purpose, a Bridgman-type gradient furnace was equipped with an inductor, which generates a rotating magnetic field in order to induce a flow in the melt. As a result, the forced melt flow substantially changes the solidified cellular microstructure. The cell size and the volume fraction of the primary tin phase were measured by an image analyzer on the longitudinal polished sections along the entire length of the samples. The microstructure was investigated by scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS). © (2014) Trans Tech Publications, Switzerland