Effect of Al-TiO2-C-XY2O3 refiner on grain size and mechanical properties of Al-5Cu alloy. (1st September 2022)

• Record Type: Journal Article
• Authors: Zhang, Ruiying; Li, Jiakang; Li, Jinxuan; Yang, Shuai; Sha, Junhao; Shi, Zhiming
• Is Part Of: Materials research express. Volume 9:Number 9(2022)
• Publication Date: 2022-09-01
• Subjects: exothermic dispersion method -- Al-TiO2-C-Y2O3 refiner -- grain refinement; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac8ae6
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract : A series of new Al-TiO2 -C-Y2 O3 aluminum alloy grain refiners with different Y2 O3 content was prepared by exothermic dispersion method using Al, TiO2, C, and Y2 O3 powders as raw materials. Scanning electron microscopy (SEM), x-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDS) were used to investigate the effect of Y2 O3 content on the structure of the Al-TiO2 -C refining agent as well as the effect of the Al-TiO2 -C-Y2 O3 refining agent on the grain size and mechanical properties of an Al-5Cu alloy. The results showed that the Al-TiO2 -C-Y2 O3 refiner was composed of Al2 O3, TiC, Al3 Ti, Al5 Y3 O12, and Al20 Ti2 Y phases. The refiner with 4% Y2 O3 content exhibited the best Al-5Cu alloy refining effect, achieving a grain size of about 210.5 μ m. This was about 42% of the grain size of the original Al-5Cu alloy. Moreover, this refined Al-5Cu alloy exhibited the best mechanical properties, with a tensile strength and elongation of 173.13 MPa and 9.19% respectively. This was a 20.9% and 83.8% improvement compared with the original Al-5Cu alloy. However, with a further increase in Y2 O3 content, an Al5 Y3 O12 phase was preferentially formed. This led to a decline in Al20 Ti2 Y phase content and a correspondingly weaker refinement effect.