Al65Cu23Fe12 quasicrystalline (QC) powder was used as a filling material for aluminium matrix composites. Quasicrystalline phase was prepared by mechanical alloying of elemental powders and subsequent annealing. To produce the composites, QC was milled together with pure aluminium in the ratios of Al - 20 mass. % QC and Al - 10 mass. % QC for various milling times. It was shown that the QC phase in these composites remains untransformed up to the temperatures of 350 - 400 degreesC. Heating up to higher temperatures initiates the reaction between QC and Al yielding ternary crystalline Al7Cu2Fe phase; an increase in the milling time raises the reaction rate.

Метод механической активации использовали для получения металломатричных композитов. В настоящей работе в качестве наполнителя использовали квазикристаллический порошок Al 65Cu 23Fe 12, полученный механическим сплавлением компонентов с последующим отжигом. В качестве матричного материала использовали чистый порошковый Al. Для получения композита порошки матричного материала и наполнителя обрабатывали в планетарной шаровой мельнице в соотношениях Al-20 вес. % Al 65Cu 23Fe 12 и Al-10 вес. % Al 65Cu 23Fe 12. Фазовый состав исследовали методами рентгеноструктурного анализа и мессбауэровской спектроскопии. Показано, что нагрев композиционных образцов ведет к взаимодействию наполнителя и матрицы с образованием интерметаллических соединений. На шлифах компактированных образцов исследовали влияние условий обработки на микротвердость композиционных материалов. Показано, что увеличение как времени механоактивационной обработки, так и продолжительности выдержки под давлением при ком-пактировании ведет к росту микротвердости.

Mechanical alloying has been used to prepare metal-matrix composites. In this work, an Al65Cu23Fe12 quasicrystalline powder was produced by mechanical alloying of components and subsequent annealing of the mixture. This powder and pure Al powder were used as the filling and matrix of the composites, respectively. To produce composites, powder mixtures Al + 20 wt % Al65Cu23Fe12 and Al + 10 wt % Al65Cu23Fe12 were milled in a planetary ball mill. The phase composition of the prepared samples was studied using X-ray diffraction analysis and Mossbauer spectroscopy. It was shown that, upon heating, the components, Al and the Al65Cu23Fe12 quasicrystalline alloy, react with the formation of intermetallics. The effect of preparation conditions on the microhardness of composites was studied using polished sections of compacted samples. It was shown that the greater the time of both milling and holding under pressure upon compacting, the higher the microhardness of the composites obtained.

Quasicrystalline (QC) powder was prepared by mechanical alloying and subsequent annealing of Al65Cu23Fe12 composition. Obtained quasicrystals were milled together with pure aluminium in the ratios of Al-20 wt% QC and Al-10 wt% QC. A hot consolidation of samples was performed under pressure of 4.5 GPa at elevated temperatures. X-ray diffraction study of the as-consolidated samples shows that the quasicrystalline phase remained in the samples if consolidation temperature was lower than 500°C. Consolidation at higher temperatures results in disappearing of the QC and formation of crystalline phases, such as Al2Cu and Al7Cu2Fe by reaction between QC and aluminium matrix. SEM study of microstructure of the composite alloys shows an absence of open porosity in the consolidated bulk samples. Besides rather large particles of reinforcing phase of about 20 μm there are also very small particles of less than 1 μm. The uniformity of particles distribution in the matrix increases with increase in the milling duration. Microhadrness measurements and compression tests were performed, an effect of the treatment parameters on the compressive strength was studied.

Aluminium-based Al-Fe alloys with Fe content of 2, 5, 8, 10 and I I wt. % were prepared by two techniques: rapid quenching (RQ) from the melt at the rate of 10(6) K/s and mechanical alloying (MA) of pure elements in a high-energy planetary ball mill. The structure of the alloys was examined using X-ray diffraction and Mossbauer spectroscopy. It is; shown that the crystalline structure refinement and the phase composition of the alloys essentially depend on the techniques used for the sample preparation. Phase transformations by high pressure torsion (HPT) of RQ and MA alloys were studied. The highest supersaturation of Fe in the aluminium-based solid solution can be reached using two subsequent techniques of alloy treatment: RQ and HPT. Microhardness measurements of HPT alloys show the significant stricture heterogeneity of specimens, the dependence of the microhardness on the radius of the pills was found. Phase composition and microhardness at beating were investigated. At the initial step of heating (120-150degreesC), an increase of microhardness was observed, whereas further heating results in decrease of the microhardness value.