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atom into the α(Al) matrix which was up to 4% (mole fraction) at room temperature and was much higher than that under the condition of equilibrium solidification (only 0.025%). Lattice parameters of α(Al...(Fe,V)3Si phase prevents this phase transforming into θ-Al13(Fe,V)4, which plays a stabilizing role of the dispersoid particles (α-Al12(Fe,V)3Si) with low r value. The stabilization function of SiC......
were put in graphite-glass cans and extruded at 750 ℃ with extrusion ratio of 81?1 (d 36 mm→d 4 mm), and the submicron crystalline Cu-5%Cr rods with relative density of about 99.5% were obtained... stability of submicron crystalline Cu-5%Cr can be achieved at last. 4 Conclusions 1) Both strength and ductility of the submicron crystalline Cu-5%Cr alloy can be enhanced by cold drawing......
frequency of 5 000 Hz, as shown in Fig.3(h). 4 Discussion Grain refinement is a great concern in metallurgy. With regards to the refinement mechanism during EMV processing, cavitation was one... in a hypereutectic Al-Si alloy melt [J]. Metall Mater Trans A, 1998, 29: 1477-1484. [4] RADJAI A, MIWA K. Structural refinement of grey iron by electromagnetic vibrations [J]. Metall Mater Trans A, 2002, 33......
Ic/Ia=1.0. The durations of the phases were τAC=2s and τC=0.78s. Fig.1 Shape of anodic-cathodic plus cathodic current The substrates of aluminum alloy(1.2%-2 % Cu, 2%-3 % Mg, 5%-6 %Zn... of microhardness of coatings prepared by AC mode are relatively difficult due to non-uniformity of its porosity. 4 CONCLUSIONS Based on the experiments mentioned above, it is clear that the controlled......
+·H2O·TBP, which is bridged by H2O molecule, so the percent gold extraction is decreased, which is the same as that reported on solvent extraction of Zr(Ⅳ) in hydrochloride acid system[24]. 4 ... in the extraction process. 4) It is reported that, since the TBP was added the cationic surfactant-H2O-inert diluent system, the W/O(water/oil) reverse emulsion could be converted to the O/W(oil / water......
, they were etched by 4% (volume fraction) HNO3 aqueous solution and observed on an optical microscope. The size and shape factor of primary particles in the semisolid microstructures were quantitatively... of microstructural evolution and phase transformations during partial remelting 4 Conclusions 1) MgCO3 is an effective grain refiner for AM60B alloy and can decrease the grain size from 329 μm of the unrefined......
characteristics of Al-Mg2Si and Al-Si systems[11] in Mg-Al-Si-Zn alloy and Mg-Si alloy, which changes the morphology of Mg2Si particles from coarse dendrites to fine particles [28-29]. However, few... Fig.5 Fractographs of Mg2Si/Al-Si composites with different Sb addition: (a) 0% Sb; (b) 0.4% Sb 4 Discussion 4.1 Evolution of phase structure According to Ref.[5], there is a narrow ternary phase......
could be explained. 4 Conclusions 1) Thixoforged A356 samples produced in this study showed significant improvement in the tensile properties compared with those of rheocast and gravity cast...) In thixoforging process, coarsened silicon particles at higher temperature would decrease the tensile properties. 4) Presence of microporosity in gravity cast A356 alloy would have the general effect......
by GLASER et al[15] for Ormosils. T3, Q3 and Q4 represent R-Si(OSi)3, Si(OSi)3(OH) and Si(OSi)4, respectively. Distinct peaks of silica network units were observed at -65×10-6 (T3), -95×10-6 (Q3... sol-gel film with three-acid surface treatment. But the former was environmentally compliant since the substrate surface treatment was alkaline washing. 4 Conclusions 1) Molecular simulation was used......
Growth process and corrosion resistance of micro-arc oxidation coating on Mg-Zn-Gd magnesium alloys WANG Ping(王 萍)1, 2, LIU Dao-xin(刘道新)1, LI Jian-ping(李建平)2, GUO Yong-chun(郭永春)2, YANG Zhong(杨 忠... coating on Mg-Zn-Gd magnesium alloys Fig.1 shows the growth process of ceramic coating in the different stages. It is apparent that the longer the treating time of MAO, the thicker the ceramic coating......
