Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: nanostructured composite

Sortuj według:

Ogranicz wyniki do:

Accumulative roll bonding fabrication, tensile and corrosion characterization of Zn/Al multilayered composites

Mosafajahanabad Nasim, Alizadeh Morteza, Salahinejad Erfan

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e191, 2022

In the present work, accumulative roll bonding (ARB) processing and characteristics of Zn/6 wt% Al multilayered composite sheets were investigated for the first time. The structure of the fabricated composites was evaluated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Tensile testing and fractography were used to assess the strength and elongation of the composites. The corrosion behavior of the fabricated samples was also investigated by potentiodynamic polarization and electrochemical impedance spectroscopic tests in the 3.5 wt% NaCl solution. Despite the evolution of atomic intermixing at the interface of the layers and grain refinement, the tensile strength and elongation of the composites were reduced by increasing ARB cycles due to the domination of plastic instability introduced by the ARB process. In addition, an initial increase until the third ARB cycle followed by decrease in the corrosion tendency of the composites was found by progression of the ARB process, which was attributed to a compromise between the levels of structural defects and homogeneity. It is eventually concluded that after optimizing the mechanical and corrosion behaviors as a function of the number of ARB cycles, ARB-processed Zn/Al multilayered composites can be further considered in industrial applications.

Mechanical alloying of Mg-based metallic glasses and nanostructured composites.

Eckert J.

Archives of Materials Science

2004

Vol. 25, nr 4

321-331

Mg55Y15Cu33-based metallic glass matrix composites are produced by mechanical alloying of elementar powder mixtures containing up to 3- vol. % of Y2O3 particles. Comparison with the particle-free metallic glass reveals that the nanosized second phase oxide particles do not significantly affect the glass-forming ability upon mechanical alloying despite some limited particle dissolution. A supercooled liquid region with an extension of about 50 K can be maintained in the processes of the oxides. The distinct viscosity decrease in the supercooled liquid regime allows for consolidation of powders into bulk samples by uniaxial hot pressing. The Y2O3 additions increase the mechanical strength of the composites compared to the Mg55Y15Cu33 metallic glass.