Registration Number
0225U004622,
(0125U003132)
, R & D reports
Title
Effect of shear deformations on the mechanisms of pore space and inter-particle boundary evolution during consolidation of powder materials
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Аналіз ущільнення та сирої міцності зразків однокомпонентних порошкових систем Fe, Ti, Al та двокомпонентних систем Fe-Al, Ti-Al, Fe-Ti
Head
Tolochyn Oleksandr I., Кандидат технічних наук
Registration Date
15-12-2025
Organization
Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine
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Analysis of the effect of shear strain on the regularities of compaction and contact formation processes in single- and hetero-component systems based on Al-Fe-Ti ductile metals. Investigation of the influence of the degree of shear strain on structural changes in the contact zone, taking into account the dislocation mechanisms of structural changes. Determination of critical strain values that correspond to the optimal conditions for contact formation. Development of computer models of compaction processes of heterocomponent systems based on the obtained results and creation of an optimal mold design, which realizes an increased contribution of the shear strain component.
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A comparative analysis of the “green” strength of samples produced using different technological routes has been carried out. It was shown that introducing a shear deformation component during compaction significantly increases the green strength. After compaction at room temperature, the green strength increases from 32 MPa for pressing and 48 MPa for stamping to 82 MPa after ADPR. It was established that additional roll pressing during ADPR increases the green strength up to 218 MPa. Samples produced using the HPS technology demonstrated the highest green strength after compaction at room temperature, with the value being sensitive to the initial porosity of the sample. At an initial porosity of 27%, the green strength after HPS reached 443.5 MPa, while at 13% porosity it was 330 MPa. For samples deformed by stamping and ADPR, the influence of deformation temperature on green strength was investigated. Stamped samples exhibited an increase in green strength with increasing temperature, which is explained by the decrease in the flow stress of iron. Samples produced by ADPR showed a non-monotonic dependence of green strength on temperature: it increased anomalously at 100 °C up to 1054 MPa, decreased to 250–300 MPa after deformation at 200 and 300 °C, and increased again to 1200 MPa at 400 °C.
Product Description
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Oleksandr I. Tolochyn
Kyryliuk Yevheniia S.
Kyryliuk Stepan F.
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2025-12-15
