Radiation-induced transformations in Heusler alloys ion-irradiated to high doses

We have studied the structures and properties of Heusler alloys of the Cu-Mn-Al and Ni-Mn-Ga systems irradiated by 40-keV Ar⁺ ions. It is established that magnetic properties of ion-irradiated samples exhibit strong variation in a narrow range of target temperatures. This variation is accompanied by significant changes in the X-ray diffraction pattern. With allowance for the results of our previous investigations, it is suggested that (i) the observed changes in the diffraction patterns are caused by the formation of nanoclusters in the crystal lattice, the symmetry of which is different from that of the initial matrix structure, and (ii) the appearance of these clusters accounts for the observed change in the magnetic properties of Heusler alloys.     

Mass transport in a nonuniform isothermal mixture of real gases

A method of describing mass transport in a nonuniform isothermal mixture of real gases is given. The computed results are compared with experimental data.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 5, pp. 827–835, November, 1987.     

Nonuniformity in cooling a bundle of elementary filaments in towers having sidestream air-blowing

Conclusions Experimental data obtained by a contactless method on the cooling of filaments in a bundle of large density in towers with sidestream blowing indicate a difficultly eliminated nonuniformity in the cooling of the elementary filaments present in the central part and on the periphery of the bundle.An increase in air delivery somewhat reduces nonuniformity in the cooling of a bundle of filaments in the region of the sweeping devices themselves, without leading to a significant decrease in cooling nonuniformity past their limits.The study performed shows that calculation of the temperature profiles of elementary filaments in a bundle differs from calculating the temperature profiles of monofilaments.Translated from Khimicheskie Volokna, No. 3, pp. 19–21, May–June, 1988.     

The effect of the additions of nanodispersed diamonds on physico-mechanical properties of the drilling tool metal matrix

The results of the studies of the effect of the ASUD99 grade nanodiamonds additions on physico-mechanical properties of the drilling tool metal matrix have been discussed. The optimal concentration of nanodiamond powder additives in the composition of a hard alloy mixture has been defined. The addition of 1–2 wt % nanodispersed diamonds has been shown to contribute to binding oxygen in the thermooxidation of diamond in the course of the tool manufacture, which makes it possible to reduce the amount of pores in the matrix material structure and to increase its density by 1.7% and hardness by 24.3%.