Microstructure and mechanical properties of SiCp/Al composite fabricated by concurrent wire-powder feeding laser deposition

In this study, the SiCp/Al matrix composites was fabricated by concurrent wire-powder feeding laser deposition (CWPLD). The microstructure and mechanical properties of the fabricated SiCp/Al composites were studied. The microstructure of fabricated composites consisted of Al matrix, SiC and reaction product Al4C3. The size of α-Al grain (mean area: 275.0 μm2) was much smaller than that of Al specimen fabricated by wire feeding laser deposition (WLD) (mean area: 1544.4 μm2). SiC and Flaky Al4C3 were non-uniformly distributed in the matrix. Al4C3 platelets distributed discontinuously at the interface between unmelted SiC and Al. Due to the inhomogeneous distribution of SiC and Al4C3, the Vickers hardness of the fabricated composites fluctuated violently, ranging from 85 HV to 120 HV. The ductility of the fabricated composites (3.75%) was lower than that of the Al specimen (8.94%) fabricated by WLD. The tensile strength of the fabricated composites (246.0 MPa) was higher than that of the Al specimen fabricated by WLD (230.8 MPa). In the tensile test, only SiC fracture were found in the fracture observation. The bonding strength of interface between SiC and Al was higher than strengths of SiC particle and Al matrix. The debonding between SiC and the Al matrix was not found on the fracture surface of tensile specimens

Effect of interface evolution on thermal conductivity of vacuum hot pressed SiC/Al composites

International audienc

Structural modeling and mechanical behavior of Metal-Porous-Polymer-Composites (MPPCs) with different polymer volume fractions

International audienceSince the past five decades, the study of new materials has become attractive in both scientific research and industrial applications. For purpose of enhancing mechanical properties of metallic foam, a new composite entitled “Metal-Porous-Polymer-Composite (MPPC)” consisting of open-cell metallic foam and filling polymers was developed by infiltrating the filling polymers throughout the connected pores in open-cell metallic foam. Based on a three-dimensional (3D) structural modeling, microscopic structural models of Al metallic foam and MPPCs with spherical pores and Kelvin’s pores are established in the finite element code. Introducing the elastoplastic mechanical properties, the polymer–metal interfacial behaviors and the proper loads and boundary conditions on these structural models of Al metallic foam and MPPCs, the numerical compressive behaviors of Al metallic foam and PA6/Al & LDPE/Al MPPCs are successfully performed. The results show that the mechanical properties of PA6/Al & LDPE/Al MPPCs are mainly influenced by the filling polymers, the kind of pores, the pore size, the polymer–metal interface, the polymer volume fraction and the distribution of pores, respectively. It means that a good understanding can be provided concerning the deformation mechanism and engineering applications of both Al metallic foam and MPPCs

Effect of Interface Evolution on Thermal Conductivity of Vacuum Hot Pressed SiC/Al Composites

International audienc