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| 1 | Fabrication and characterization of laminated Ti-(TiB + La_2O_3)/Ti composite显示文摘The incorporation of ceramic particulate reinforcements into titanium alloys can improve the specific strength and specific stiffness,while inevitably reduce the plasticity and ductility.In this study,in situ synthesized multilayer Ti-(TiB +La_2O_3)/Ti composite was designed by learning from the microstructure of nature biological materials with excellent mechanical properties.The Ti-(TiB + La_2O_3)/Ti composite with unique characteristic of laminated structure was prepared by combined powder metallurgy and hot rolling.The method has the synthesize advantages with in-situ reaction of Ti and LaB_6 at high temperature and controllability of reinforcements size and constituent phases in composites.The result shows that the pores in the as sintered laminated structure composite completely disappeared after hot rolling at 1050℃.The agglomerated reinforcement particles were well dispersed and distributed uniformly along the rolling direction.The thickness of pure Ti layer and(TiB+La_2O_3)/Ti composite layer decreased from 1 mm to about 200 μm.Meanwhile,the grains size was refined obviously after rolling deformation.The room temperature tensile test indicates that the elongation of the laminated Ti-(TiB + La_2O_3)/Ti composite improved from 13%to 17%in comparison with the uniform(TiB + La_2O_3)/Ti composite,while the tensile strength had little change.It provides theoretical and experimental basis for fabricating the novel high performance laminated Ti-(TiB + La_2O_3)/Ti composites. | Yuanfei Han Hongqiang Duan Weijie Lu Liqiang Wang Di Zhang | 2015 | Progress in Natural Science:Materials International2015，25，5： | 8 |
| 2 | In situ(α-Al_2O_3+ZrB_2)/Al composites with network distribution fabricated by reaction hot pressing显示文摘In situ(α-Al_2O_3+ZrB_2)/Al composites with network distribution were fabricated using low-energy ball milling and reaction hot pressing. Differential thermal analysis(DTA) was used to study the reaction mechanisms in the Al–Zr O2–B system. X-ray diffraction(XRD) and scanning electron microscopy(SEM) in conjunction with energy-dispersive X-ray spectroscopy(EDX) were used to investigate the composite phases, morphology, and microstructure of the composites. The effect of matrix network size on the microstructure and mechanical properties was investigated. The results show that the optimum sintering parameters to complete reactions in the Al–Zr O2–B system are 850°C and 60 min. In situ-synthesized α-Al2O3 and Zr B2 particles are dispersed uniformly around Al particles, forming a network microstructure; the diameters of the α-Al2O3 and Zr B2 particles are approximately 1–3 μm. When the size of Al powder increases from 60–110 μm to 150–300 μm, the overall surface contact between Al powders and reactants decreases, thereby increasing the local volume fraction of reinforcements from 12% to 21%. This increase of the local volume leads to a significant increase in microhardness of the in situ(α-Al2O3–Zr B2)/Al composites from Hv 163 to Hv 251. | El Oualid Mokhnache Gui-song Wang Lin Geng Kaveendran Balasubramaniam Abdelkhalek Henniche Noureddine Ramdani | 2015 | International Journal of Minerals,Metallurgy and Materials2015，22，10： | 0 |
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