The mechanical properties of the SiC fiber-reinforced Mg-Al metal matrix composite materials have been studied on internal microstructure by (scanning electron microscopy) SEM in-situ tensile test. The emergence and p...The mechanical properties of the SiC fiber-reinforced Mg-Al metal matrix composite materials have been studied on internal microstructure by (scanning electron microscopy) SEM in-situ tensile test. The emergence and propagation of the crack, and the fracture behavior in materials have been observed and studied. It is found that in the case of the tensile test, the crack emerged in SiC fiber initially. In the case of the strong cohesion of the fiber-metal interface, the crack propagated in the fiber, meanwhile the fibers in the neighborhood of the cracked fiber began to crack and the Mg-Al metal deformed plastically, and at last the material fractured. Otherwise the toughness of the materials grows in the case of the lower cohesion of the fiber-metal matrix interface.展开更多
In this work MgO/Al_2O_3 nanocomposites with weight ratios from 5% to 25% were synthesized by precipitationimpregnation method and their structural properties were characterized. In the next step, the capability of th...In this work MgO/Al_2O_3 nanocomposites with weight ratios from 5% to 25% were synthesized by precipitationimpregnation method and their structural properties were characterized. In the next step, the capability of the nanocomposites in H_2S removal compared to Mg–Al spinel(MgAl_2O_4), synthesized through ion-pair complex precursor route and alumina samples, prepared via sol–gel precipitation methods, was investigated. The results indicated that among the studied sorbents Mg–Al spinel presents a distinctly higher H_2S removal. In addition, the MgO/Al_2O_3 nanocomposites compared to the alumina sorbents, exhibited much better performance in H_2S removal. Also CO_2-TPD analysis reveals higher amounts of basic sites for Mg–Al spinel compared to 25 wt% MgO/75 wt% Al_2O_3 nanocomposite.展开更多
文摘The mechanical properties of the SiC fiber-reinforced Mg-Al metal matrix composite materials have been studied on internal microstructure by (scanning electron microscopy) SEM in-situ tensile test. The emergence and propagation of the crack, and the fracture behavior in materials have been observed and studied. It is found that in the case of the tensile test, the crack emerged in SiC fiber initially. In the case of the strong cohesion of the fiber-metal interface, the crack propagated in the fiber, meanwhile the fibers in the neighborhood of the cracked fiber began to crack and the Mg-Al metal deformed plastically, and at last the material fractured. Otherwise the toughness of the materials grows in the case of the lower cohesion of the fiber-metal matrix interface.
基金Supported by the National Science Foundation of Iran(INSF)
文摘In this work MgO/Al_2O_3 nanocomposites with weight ratios from 5% to 25% were synthesized by precipitationimpregnation method and their structural properties were characterized. In the next step, the capability of the nanocomposites in H_2S removal compared to Mg–Al spinel(MgAl_2O_4), synthesized through ion-pair complex precursor route and alumina samples, prepared via sol–gel precipitation methods, was investigated. The results indicated that among the studied sorbents Mg–Al spinel presents a distinctly higher H_2S removal. In addition, the MgO/Al_2O_3 nanocomposites compared to the alumina sorbents, exhibited much better performance in H_2S removal. Also CO_2-TPD analysis reveals higher amounts of basic sites for Mg–Al spinel compared to 25 wt% MgO/75 wt% Al_2O_3 nanocomposite.
