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Post SPD Material's Recovery in Thermal Exposition

100%
Kvačkaj T., Kováčová A., Kočiško R.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
689-692
EN
The mechanical and thermo-physical properties of Cu-Cr-Zr alloys in dependence on processing conditions were studied. The processing conditions consisted of solution annealing at temperature of 1020°C for 60 min followed by water quenching. This was followed by one equal channel angular pressing pass carried out at ambient temperature, ageing treatment (T_{AT}∈ (20;480⟩°C, t_{AT}∈ ⟨30;150⟩ min) and cooling in water. The maximal strengthening effect coming from dislocations & grain size refinement & precipitation strengthening of ΔHV0.1=130 was achieved at T_{AT}=480°C and for t_{AT}=120 min. From differential scanning calorimetry analysis, two partial exothermal peaks were recognized and classified as major and minor, these peaks are used to determination the stored energy coming from recrystallization and precipitation (ΔH_R and ΔH_P). The maximal value in stored energy of H_{1×ECAP}=2.923 J/g was obtained after 1st ECAP pass.
2
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New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

88%
Kvačkaj T., Kováčová A., Bidulská J., Bidulský R., Kočičko R.
Archives of Metallurgy and Materials
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2015
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issue 2
3
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The Effect of Severe Plastic Deformation and Heat Treatment on CuCrZr Alloys

88%
Kováčová A., Kvačkaj T., Kočiško R., Dragošek L., Lityńska-Dobrzyńska L.
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2017
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vol. 131
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issue 5
1336-1339
EN
CuCrZr alloy was subjected to equal channel angular pressing method, belonging to the severe plastic deformation group, followed by heat treatment under different ageing conditions to optimize mechanical properties of the alloy. Before equal channel angular pressing, CuCrZr alloy was treated by solution annealing at temperature 1020°C for 1 h. Afterwards, samples were pressed through an equal channel angular pressing die once at room temperature and subjected to artificial ageing under different conditions (200, 400, 450, 480°C for 30, 60, 90, 120, 150 min). Optimization of the CuCrZr alloy was done through the study of mechanical properties and microhardness as a function of ageing temperature and time considering the progress in microstructural/substructural features.
4
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Investigation of the Ultrafine-Grained Structure Formation under Different Strain Rates

76%
Kováčová A., Lityńska-Dobrzyńska L., Dutkiewicz J., Kvačkaj T., Bidulský R., Bidulská J., Kočiško R.
Archives of Metallurgy and Materials
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2017
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vol. 62
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issue 2
5
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Mechanical and Structural Properties of High Purity Al Processed by ECAP

64%
Kvačkaj T., Kočiško R., Pokorný I., Bidulská J., Kvačkaj M., Kováčová A., Bidulský R., Lityńska-Dobrzyńska L., Dutkiewicz J.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
557-560
EN
The mechanical properties and substructure formation of high purity aluminium (99.999%) processed by severe plastic deformation method (equal channel angular pressing) were studied. The equal channel angular pressing process was carried out at room temperature by route C (sample rotation around the axis about 180° after each pass) in a die with two channels intersecting at an angle of Φp = 90. The softening mechanism through dynamic recovery was recognized up to 6th equal channel angular pressing pass, however, after that the mechanical strengthening was revealed. The samples after equal channel angular pressing processing were annealed in different temperature and time conditions. The influence of annealing temperature and time on microhardness as well as diameter of grain size were investigated in samples processed by the 4th equal channel angular pressing pass.
6
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Application of Workability Test to Spd Processing

64%
Kvačkaj T., Kočiško R., Tiža J., Bidulská J., Kováčová A., Bidulský R., Bacsó J., Vlado M.
Archives of Metallurgy and Materials
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2013
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issue 2
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