Effect of Al-Ti-C master alloy addition on microstructures and mechanical properties of cast eutectic Al-Si-Fe-Cu alloy

Publication date: 5 February 2017
Source:Materials & Design, Volume 115
Author(s): Peng Tang, Wenfang Li, Kang Wang, Jun Du, Xiyong Chen, Yanjun Zhao, Weizhou Li
The microstructure and mechanical properties of cast eutectic Al-Si-Fe-Cu alloy influenced by different additions of Al-Ti-C master alloys (viz. 0, 0.2, 0.6, 1.0 and 2.0wt.%) were investigated. The phases and their morphologies in these alloys were identified by XRD and SEM equipped with EDS. In order to estimate the apparent size of the phases in these alloys, morphological identification technique based on the digital OM image was carried out. The results indicated that the Al-Ti-C could effectively refine the coarse phases. The mean apparent lengths of coarse secondary phases were decreased to a minimum value when the Al-Ti-C addition reached 0.6wt.%. The mechanical properties of the samples with various additions of Al-Ti-C were investigated by tensile and hardness tests. It was found that the UTS, % elongation and HB values were related to the mean perimeters of the phases in these alloys.

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