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Wang T.,Shandong University | Gao T.,Shandong University | Nie J.,Shandong University | Li P.,Shandong University | Liu X.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials
Materials Characterization | Year: 2013

A new kind of Al-5Ti-0.3C master alloy with a uniform microstructure was prepared by using Al-5C alloy as a carbon source in this study. In the master alloy, TiC particles exhibit hexagonal platelet and macroporous morphologies, distributing homogeneously in the aluminum matrix. It is supposed that TiC particles are synthesized by the reaction between dissolved Ti and Al 4C3. The grain refining performance of the master alloy on commercial pure aluminum was investigated. The average grain size of α-Al can be reduced from 3300 μm to 178 μm with the addition of 0.2 wt.% of the prepared Al-5Ti-0.3C master alloy. Besides, the grain refining efficiency is stable and does not fade within 30 min. © 2013 Elsevier Inc. All rights reserved. Source


Zhang F.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | An Y.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Zhai W.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Gao X.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | And 3 more authors.
Materials Research Bulletin | Year: 2015

Abstract A series of transition metal silicate hollow spheres, including cobalt silicate (Co2SiO4), manganese silicate (MnSiO3) and copper silicate (CuSiO3.2H2O, CuSiO3 as abbreviation in the text) were prepared via a simple and economic hydrothermal method by using silica spheres as chemical template. Time-dependent experiments confirmed that the resultants formed a novel type of hierarchical structure, hollow spheres assembled by numerous one-dimensional (1D) nanotubes building blocks. For the first time, the transition metal silicate hollow spheres were characterized as novel anode materials of Li-ion battery, which presented superior lithium storage capacities, cycle performance and rate performance. The 1D nanotubes assembly and hollow interior endow this kind of material facilitate fast lithium ion and electron transport and accommodate the big volume change during the conversion reactions. Our study shows that low-cost transition metal silicate with rationally designed nanostructures can be promising anode materials for high capacity lithium-ion battery. © 2015 Elsevier Ltd. Source


Wei R.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Zhang Y.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Zhang Y.,Shandong University | Gong H.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | And 2 more authors.
Ceramics International | Year: 2013

Boron carbide ceramics used as neutron absorbing materials in fast breeder reactor were fabricated with boron carbide powders and different rare-earth oxide additives by pressureless sintering. The effects of rare-earth oxide as well as phenolic resin on densities and mechanical properties of the composites were studied. The addition of Dy2O3, Eu2O 3, and Sm2O3 was found to be beneficial in the densification of B4C ceramics. B4C with 4 wt% rare-earth oxide and 18 wt% phenolic resin, exhibiting bulk density of 90-96% T.D., flexural strength of 276-358 MPa, could be prepared by pressureless sintering at 1960-2080 °C, which are capable of meeting the requirement of fast breeder reactor. © 2013 Elsevier Ltd and Techna Group S.r.l. Source


Hu X.-X.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Hu X.-X.,Shandong University | Lu Y.-P.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Lu Y.-P.,Shandong University | And 6 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

Hydroxyapatite (HA) coatings on beveled titanium cylindrical substrates with various angles were fabricated using plasma spraying method. And then, the coatings were heat-treated under different shear stress and the same normal stress conditions. The shear strength between the coating and the substrate was measured by electronic tension machine. Phase compositions and crystallinity of the coatings were examined using X-ray diffraction (XRD). The effect of pre-stress on heat treatment behavior of hydroxyapatite coatings was researched by evaluating shear strength, phase compositions and crystallinity. The results showed that the crystallinity of coatings and the bonding strength of the interface were improved by the pre-stress onto the samples during heat treatment. Source


Zheng C.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Zheng C.,Shandong University | Ji Z.,Key Laboratory for Liquid solid Structural Evolution and Processing of Materials | Ji Z.,Shandong University | And 7 more authors.
Optics and Laser Technology | Year: 2015

Micro-scale laser shock punching is a high strain rate micro-forming method which uses the high-amplitude shock wave pressure induced by pulsed laser irradiation. The response of brass and pure titanium foils under the different ratio of laser beam diameter (d) to die hole diameter (D) in micro-scale laser shock punching was investigated experimentally and numerically. The typical fracture surface morphologies were observed using scanning electron microscope. Numerical simulations were conducted to predict the stress state of the workpiece before and after fracture. The influence of the ratio d/D on dynamic deformation and fracture of metal foils was characterized. The results demonstrate that both the crack locations and fracture surface morphologies of metal foils are strongly related to the ratio d/D. The fracture mode varies from a shear fracture mode to a mixed fracture mode, then to a tensile fracture mode as the ratio decreases. The stress state under the different ratio is discussed in detail and believed to be responsible for the variation. © 2015 Elsevier Ltd. All rights reserved. Source

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