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RISS 인기검색어
- 검색키워드
- 저자 : A. A. Bataev (검색결과 3 건)
- 무료
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Metallic Glass Formation at the Interface of Explosively Welded Nb and Stainless Steel
I. A. Bataev,K. Hokamoto,H. Keno,A. A. Bataev,I. A. Balagansky,A. V. Vinogradov 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
The interface between explosively welded niobium and stainless steel SUS 304 was studied using scanning electron microscopy, transmission electron microscopy and energy dispersive X-Ray spectroscopy. The wavy interface along which vortex zones were located was observed. The vortex zones formed due to the mixing of materials typically had amorphous structure. Inoue’s criteria of glass formation were used to explain this result. The effect of the composition, cooling rate and pressure on the glass formation are discussed. The conditions of deformation, heating, and cooling as well as shockwaves propagation were numerically simulated. We show that the conditions of vortex zone formation resemble the conditions of rapid solidification processes. In contrast to the "classical" methods of rapid solidification of melt, the conditions of metastable phase formation during explosive welding are significantly complicated by the fluctuations of composition and pressure. Possible metastable structures formation at the interface of some common explosively joined materials is predicted.
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Dina V. Dudina,Vyacheslav I. Mali,Alexander G. Anisimov,Natalia V. Bulina,Michail A. Korchagin,Oleg I. Lomovsky,Ivan A. Bataev,Vladimir A. Bataev 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6
We present several possible microstructure development scenarios in Ti3SiC2-Cu composites during mechanical milling and Spark Plasma Sintering (SPS). We have studied the effect of in situ consolidation during milling of Ti3SiC2 and Cu powders and melting of the Cu matrix during the SPS on the hardness and electrical conductivity of the sintered materials. Under low-energy milling, (3-5) vol.%Ti3SiC2-Cu composite particles of platelet morphology formed, which could be easily SPS-ed to 92-95% relative density. Under high-energy milling, millimeter-scale (3-5) vol.%Ti3SiC2-Cu granules formed as a result of in situ consolidation and presented a challenge to be sintered into a bulk fully dense sample; the corresponding SPS-ed compacts demonstrated a finer-grained Cu matrix and more significant levels of hardening compared to composites of the same composition processed by low-energy milling. The 3 vol.% Ti3SiC2-Cu in situ consolidated and Spark Plasma Sintered granules showed an extremely high hardness of 227 HV. High electrical conductivity of the Ti3SiC2-Cu composites sintered from the granules was an indication of efficient sintering of the granules to each other. Partial melting of the Cu matrix, if induced during the SPS, compromised the phase stability and uniformity of the microstructure of the Ti3SiC2-Cu composites and thus it is not to be suggested as a pathway to enhanced densification in this system.
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Ivan V. Ivanov,Daria V. Lazurenko,Andreas Stark,Florian Pyczak,Alexander Thömmes,Ivan A. Bataev 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.1
This paper presents a comparison between the “classical” and the modified Williamson–Hall and Warren–Averabach methodsapplied to an analysis of the microstructure of -titanium. The microstructural parameters of cold-rolled titanium specimenswere retrieved from analysis of the X-ray diffraction (XRD) peaks. The high-quality XRD patterns were received at the P07beamline (The High Energy Materials Science) at the German electron synchrotron. The dependence of the crystallite size,the inhomogeneous microstrains, the average dislocation density, the dislocation cut-off radius and some other parameterson the plastic strain were estimated. The results clearly indicate that, due to the consideration of the dislocation contrasteffect, the modified models are a much better fit to the experimental data in comparison with the “classical” models. Theresults of hardness and corrosion resistance measurements of Ti samples can be explained based on the results obtainedfrom the XRD analysis.
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