The isothermal static corrosion of Ti-45Al-8Nb and Ti-53Al-20Nb (at.%) in liquid Zn-55Al-1.6Si (wt.%) at 630°C was studied. Incubation periods without any corrosion occurred are exhibited in both alloys. After the incubation time, the corrosion rate increases noticeably which is controlled by the reaction-diffusion and dissolution mechanism. Thick transition layers were formed. The EDS results show that Si and Al diffused into the TiAl-Nb alloys preferentially, while Zn was hindered from diffusing and segregated in spots. All the transition layers are porous and composed mainly of Al3Ti (Nb), SiTi and AlNbZn2. The fracture of the transition layers of Ti-45Al-8Nb should be attributed to the defects of the lamellar colony boundaries. nanoIndenter was used to check the mechanical properties of the materials. The results show that the transition layers have higher micro-hardness and elastic modulus than the matrix.
That griping and predicting concrete strength is crucial importance for shorten design cycle of cement concrete proportion and control efficiently key construction node in time. The paper exposited systematically experimental method of strength estimation of cement concrete and corresponding research progress at present, and the prospect was also analyzed. It is very necessary to promote research work of experiment and analysis method because strength estimation of cement concrete is paramount. It has important meaning for delving into the aspect through above discussion in the future.
In order to shorten time-periodic of mix design and verification of cement concrete in the period of construction, and can realize the node control of key procedure of cement concrete structure. The paper obtained and established relationship between super-early-stage strength and compressive strength of 7d, 14d and 28d of cement concrete on based of microwave promoting curdle. The method can realize predication of cement concrete through microwave promoting curdle.
In order to estimate late strength of high performance concrete on based of early strength, so which can realize shorting time cycle of proportion design and proportion verification of high performance concrete, and can realize controlling node of key working procedure for the structure of high performance concrete in the course of construction. The paper obtained early strength and established relationship between early compressive strength and late compressive strength of high performance concrete on based of method of microwave promoting curdle. Getting early strength can realize to predict compressive strength through applying in the method of microwave promoting curdle.
Fe-6.5wt.%Si alloy is one excellent soft magnetic material. In the present study, rapid quenching was applied to fabricate ultra-thin ribbons of Fe-6.5wt.%Si alloy by melt spinning. Continuous ribbons of 20 mm wide, 35-45 μm thick were fabricated with optimized experimental parameters. The ribbons exhibited metallic luster appearance, and can be wound without cracks. Microstructure, texture and mechanical properties of the ribbons were investigated. It was found that the rapidly quenched ribbons had intense {100} plane texture, and exhibited some extent of bending capability. Finally the ribbons were cold rolled and the surface smoothness was improved for stacking purpose.
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