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Yuan Y.B.,Science 37 | Zheng R.X.,Science 37 | Ge S.J.,Hebei Sitong New Metal Material co. | Yang H.,Science 37 | Ma C.L.,Science 37
Materials Science Forum | Year: 2013

Al86Ni7Y4.5Co1La1.5 (at.%) alloy powder was produced by argon gas atomization process.After high-energy ball milling, the powder was consolidated and extruded by using vacuum hotpress sintering under different process conditions, sintering temperature, extrusion pressure,sintering time, etc. The microstructure and morphology of the powder and consolidated bulk alloywere examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmissionelectron microscopy (TEM). The phase transformation of the powder was investigated bydifferential scanning calorimetry (DSC). Mechanical properties of the consolidated bulk alloy wereexamined. The results showed that as the milling time increase, the volume fraction of amorphousmaterials and the hardness and yield strength of the bulk alloy were obvious improved. © (2013) Trans Tech Publications, Switzerlan. Source


Hao X.,Beihang University | Zheng R.,Beihang University | Hao L.,Hebei Sitong New Metal Material co. | Yang H.,Beihang University | Ma C.,Beihang University
Materials Science Forum | Year: 2013

Nanocrystalline (NC) Al alloy powder was fabricated by milling 2024 Al alloy powder andFe-based metallic glass (FMG) particles. The NC Al alloy powder was consolidated into bulk sampleby adding a part of atomized coarse-grained (CG) 2024 alloy powder. The microstructure andmechanical properties of powder and consolidated bulk materials were examined by X-RayDiffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy(TEM) and mechanical test. It revealed that the FMG particles were uniformly distributed in the NCaluminum alloy powder. In the consolidation process, the grain size increased, and Al2CuMg phaseprecipitated. The multi-modal Al alloy by consolidation of FMG particles, NC and CG powder,exhibited higher yield strength up to 517 MPa and better plasticity in comparison to the sampleswithout CG powder. © (2013) Trans Tech Publications, Switzerland. Source


Wang X.-J.,Beihang University | Xu C.,Beihang University | Muhammad A.,Beihang University | Hanada S.,Tohoku University | And 3 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

To investigate the effects of Al-Ti-B-RE grain refiner on microstructure and mechanical properties of Al-7.0Si-0.55Mg (A357) alloy, some novel Al-7.0Si-0.55Mg alloys added with different amount of Al-5Ti-1B-RE grain refiner with different RE composition were prepared by vacuum-melting. The microstructure and fracture behavior of the Al-7.0Si-0.55Mg alloys with the grain refiners were observed by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), and the mechanical properties of the alloys were tested in mechanical testing machine at room temperature. The observation of Al-Ti-B-RE morphology and internal structure of the particles reveals that it exhibits a TiAl3/Ti2Al20RE core-shell structure via heterogeneous TiB2 nuclei. The tensile strength of Al-7.0Si-0.55Mg alloys with Al-5Ti-1B-3.0RE grain refiner reaches the peak value at the same addition (0.2%) of grain refiner. © 2014 The Nonferrous Metals Society of China. Source


Xu C.,Beihang University | Du R.,Beihang University | Wang X.-J.,Beihang University | Hanada S.,Tohoku University | And 3 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

Al-1.0%Sc-1.0%Zr (mass fraction) master alloy was prepared at different cooling rates. The morphology and thermodynamics data of the primary particles of the master alloy were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). It shows that the primary particles are dendrite-shaped particles comprised of several attached small cubic, cusped-cubic or crucifer shape particles at slow cooling rate. However, the primary particles are separated with crucifer shape at intermediate cooling rate, and they are cubic with cusped-cubic shape at high cooling rate. Meanwhile, the separated and attached particles present Al 3Sc/Al3Zr1-xScx core-shell structure. The formation mechanism of the structure was systematically investigated by a mathematical model. © 2014 The Nonferrous Metals Society of China. Source


Liu J.-Y.,Southwest University of Science and Technology | Yan W.-Q.,Southwest University of Science and Technology | Yan W.-Q.,Hebei Sitong New Metal Material co. | Kang M.,Southwest University of Science and Technology | And 3 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2011

SrCO 3:Eu 3+ precursor was synthesized through microwave asssisted co-precipitation method, then the SrCO 3:Eu 2+ phosphor was obtained by high temperature reduction process. The structure and luminescence properties of the SrCO 3:Eu 2+ were analyzed by XRD and PL-PLE. The results showed that the best sintering temperature was 1100°C and the optimum content of boric acid was 15%. In addition, the excitation spectrum of the SrCO 3:Eu 2+ phosphor was consisted of two broad bands at 220-320 nm and 400-580 nm, and the emission spectrum was located at 550-700 nm. It's characteristic emission peak was at about 610 nm (λ ex=475 nm), which belong to red fluorescence. This strontium carbonate matrix phosphor which have broadband excitation and emission could be used for manufacturing fluorescent glass. Source

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