Effect of Al-Ti-C master alloy addition on microstructures and mechanical properties of cast eutectic Al-Si-Fe-Cu alloy. (5th February 2017)

• Record Type: Journal Article
• Authors: Tang, Peng; Li, Wenfang; Wang, Kang; Du, Jun; Chen, Xiyong; Zhao, Yanjun; Li, Weizhou
• Is Part Of: Materials & design. Volume 115(2017)
• Page Start: 147
• Page End: 157
• Publication Date: 2017-02-05
• Subjects: Al-Si-Fe-Cu alloy -- Al-Ti-C master alloy -- Morphological identification technique -- Coarse phases -- Mechanical properties; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.11.036
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: 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 2.0 wt.%) 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 0.6 wt.%. 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. Graphical abstract: In this research, the coarse phase in eutectic Al-Si-Fe-Cu alloy was refined by Al-5Ti-C master alloy. An image processing system was indigenously developed for the identification of the phases from the microstructures. The effect of the length of these phases on the mechanical properties of these alloys was investigated. Further illustration about the refinement mechanism of coarse phase was proposed based on the SEM observation. The change in mechanical properties corresponds to evolution of the average length of coarse phase quantification. Highlights: The Al-Ti-C alloy was used for refining the coarse phases in Al-Si-Fe-Cu alloy. Effect of the Al-Ti-C additions on the microstructures and mechanical properties of Al-Si-Fe-Cu alloy was studied. The optimum mechanical properties were obtained with the 0.6%.Al-Ti-C addition.