Search

A high performance near eutectic Al–Si–Mg alloy profile is developed by micro alloying with 0.1wt.% Ti. The tensile properties of near eutectic Al–Si–Mg alloy with and without Ti in different processing conditions are tested for comparison. Microstructure evolution is observed by optical, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Results show that the yield strength (YS), ultimate tensile strength (UTS) and elongation of 0.1wt.% Ti alloyed A2 alloy reach up to 193 MPa, 296 MPa and 12.3% respectively, the tensile strength of which is about 50% higher than that of as-extruded base alloy and even stronger than that of the base alloy micro alloyed by 0.1wt.% Zr or 0.1wt.% V. Addition of 0.1wt.% Ti has obvious refine effect on the microstructure of as-cast Al–Si–Mg alloy, however, it has minor strengthening effect on the as-cast mechanical properties. [ABSTRACT FROM AUTHOR]

Abstract: Ti/Si/C powders were used to fabricate high purity Ti3SiC2 with the aids of Al by spark plasma sintering (SPS). The results showed that the dense Ti3SiC2 samples with <2wt.% TiC could be rapidly synthesized from Ti/Si/C/Al mixtures at 1280°C for 6–36min. The sintering temperature and the sintering time was lower and shorter than that by hot isostatic pressing (HIP) or hot pressing (HP) from Ti/Si/C mixtures. The microstructures of Ti3SiC2 depend on the sintering temperature and holding times of SPS and can be controlled accordingly. The technological implication of this work is that, with the aids of Al, Ti/Si/C can be suggested to be the powder mixture to synthesize high purity Ti3SiC2 in addition to Ti/Si/TiC powder mixture. [Copyright &y& Elsevier]