Early stages of transformation of a metastable AlCuMg alloy have been studied by DSC, X-ray powder diffraction method, quantitative microstructure analysis, hardness, compression strength and by scanning electron microscope. Differential scanning calorimetry has been done for samples: AlCu15Mg1 (0%Ti), AlCu15Mg1 (0.25%Ti), AlCu15Mg2 (0.25%Ti), AlCu15Mg3 (0%Ti), AlCu15Mg3 (0.25%Ti), AlCu15Mg4 (0.25%Ti), AlCu15Mg5 (0%Ti), AlCu15Mg5 (0.25%Ti). This method has produced DSC-curve, where endothermal effects are present, on the basis of which the heat of transition has been obtained. With increasing the magnesium and titanium content in the alloy, for the first and the second detectable endothermal effect, the value of heat of transition decreases. The formation of intermetallic compounds Al 2 Cu and Al 2 CuMg is monitored by X-ray powder diffraction. This method has shown that a tetragonal intermetallic compound Al 2 Cu and orthorhombic intermetallic compound Al 2 CuMg are formed for AlCuMg alloy. The effect of the magnesium and titanium content on the microstructure was monitored quantitatively. Using automatic image analysis we were able to measure the linear intercept grain size, the secondary dendrite arm spacing (DAS), the size of eutectic cells (Le), as well as the size distribution and volume fractions of the -solid solution and the eutectic. In alloys containing high magnesium the average values of the DAS and grain size were found to be reduced.
In this paper, the effect of copper and magnesium contents on the microstructure and properties of AlCuMg alloys was examined. Differential scanning calorimetry was used to study AlCu5Mg2 (0.25%Ti), AlCu5Mg4 (0.25%Ti), AlCu15Mg2 (0.25%Ti) and AlCu15Mg4 (0.25%Ti) alloys. From the obtained DSC-curves, indicating two endothermal effects, the transition enthalpy was calculated. It decreases with increasing copper and magnesium content in the alloy, for the first detectable endothermal effect. Formation of a tetragonal Al 2 Cu and orthorhombic Al 2 CuMg intermetallic compound in the investigated alloys was studied by X-ray powder diffractometry. Changes in chemical composition of the alloy caused changes in the structure reflected in the Brinell hardness and the compression strength. Compression strength and hardness increase with an increase in copper and magnesium content.
The effect of magnesium content, in the range 1 -5%, on the microstructure of aluminium -copper -magnesium alloys was examined. Using X-ray powder diffraction it was established that the tetragonal intermetallic compound Al 2 Cu with lattice parameters a~6 . 034 A S , c~4 . 870 A S , and V~177 . 31 A S 3 and the orthorhombic intermetallic compound Al 2 CuMg with lattice parameters a~4 . 011 A S , b~9 . 251 A S , c~7 . 007 A S , and V~264 . 74 A S 3 are formed across the whole range of magnesium additions. The effect of magnesium content on the microstructure was monitored quantitatively. Using automatic image analysis the linear intercept grain size, secondary dendrite arm spacing (DAS), size of eutectic cells (L e ), and the size distribution and volume fractions of a solid solution and eutectic were measured. In alloys containing high magnesium content the average values of DAS and grain size were found to decrease.MST/5565
Using an automatic, QUANTIMET 500 MC, device for quantitative picture analysis and applying linear method of measurement on the example of AlCu5Mg1 alloys, the grain size (min, max and medium values), as well as relative standard measuring errors (RSE), dendrite arm spacing (DAS) and length eutectic (Le) and also distribution by size (histogram) and volume participation of -hard solution and eutectic have been determined. We have also studied the influence of grain-refining additives AlTi5B1 for the same chemical composition of the aluminium-capper-magnesium alloy. It has been concluded that with the increase of titanium content, the mean value of grain size decreases. We have also examined hardness and pressure strength
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