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Lin G.,Central South University | Zeng J.,Central South University | Zeng X.-H.,Key Laboratory of Non ferrous Metal Materials Science and Engineering | Sun L.,Central South University | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2010

Effects of different special casting methods, such as semi-continuous casting, centrifugal casting and vacuum suction, on microstructure and properties of QA110-4-4 aluminum bronze were investigated by OM (optical microscope), XRD (X-ray diffraction), tensile testing, SEM (scanning electron microscope) and EDS (energy dispersive spectrometer). The results show that a phase, γ2 phase and K phase can be observed in the alloys prepared by three kinds of casting methods. In addition, a little metastable (3 phase can be observed in microstructure of vacuum suction alloy. Microstructure of vacuum suction alloy exhibits the finest and the most compactness, in which K phase is homogeneously distributed. Meanwhile, the highest microhardness and tensile strength as well as hardness can be obtained. Inner-outer microstructure of semi-continuous casting and centrifugal casting specimens become heterogeneous, in which K phase is partly agglomerated. Micro-hardness of centrifugal casting specimen exhibits periodically fluctuated from the edge to the heart. The peak hardness is increased nearby the edge. Source

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