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RISS 인기검색어
- 검색키워드
- 저자 : Rofman, O.V. (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Fabrication of AA2024/SiCp Metal Matrix Composite by Mechanical Alloying
O. V. Rofman,A. S. Prosviryakov,A. D. Kotov,A. I. Bazlov,P. O. Milovich,Gopalu Karunakaran,A. V. Mikhaylovskaya 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Mechanical alloying is a widely used alternative to the liquid-phase method of embedding reinforcements to manufacturemetal matrix composites (MMC). In this research, high-energy ball milling was used to distribute various volume fractionsof sub-micron-sized SiCpparticles (2, 10, and 20 vol%) in AA2024 aluminum powder alloy, focusing on powder morphologyand milling conditions. An increase in the full width at half-maximum and the shifting of peaks at higher angles wereobserved after mechanical alloying. These examinations were attributed to changes in the lattice parameters of the matrixalloy. It was noted that the temperature and loading pressure during the die compaction stages of MMC powders directlyaffect the compact density, whereas the volume fraction of SiCpchanges hardness. Compression testing, conducted at elevatedtemperatures to evaluate the plastic properties of the material, showed sufficient ductility characteristics for thermomechanicalprocessing.
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Influence of neutron irradiation and ageing on behavior of SAV-1 reactor alloy
Tsay, K.V.,Rofman, O.V.,Kudryashov, V.V.,Yarovchuk, A.V.,Maksimkin, O.P. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
This study observed the effect of neutron irradiation and ageing on the microstructure, hardness, and corrosion resistance of SAV-1 (Al-Mg-Si) alloy. The investigated material was irradiated with neutrons to fluences of 10<sup>21</sup>-10<sup>26</sup> n/m<sup>2</sup> in the WWR-K research reactor and kept in dry storage. Long-term irradiation led to an increase in hardness of the alloy and a deterioration of pitting corrosion resistance. Post-irradiation ageing for 1 h at 100-300 ℃ resulted in a decrease in microhardness of the irradiated SAV-1. The effect of post-irradiation ageing on pitting corrosion was made clear through the formation of Guinier-Preston zones and secondary precipitates in the Al matrix. Ageing at 250 ℃ corresponded to the development of stable microstructure and the highest corrosion resistance for the irradiated samples. Mg<sub>2</sub>Si, Si, and needle-shaped β" precipitates were formed in SAV-1 alloy that was irradiated with low fluences. β" and clusters of rod-shaped B-type precipitates were observed in highly irradiated samples. The precipitates were similar to those seen in non-irradiated pseudo-binary Al-Mg<sub>2</sub>Si alloys with Si excess.
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