Titanium carbonitride seeded crystallization of aluminum. (27th March 2019)

• Record Type: Journal Article
• Authors: Xiang, Yanling; Xiao, Sufen; Tang, Zhenghua; Luo, Feifei; Qian, Pingping
• Is Part Of: Materials research express. Volume 6:Number 6(2019)
• Publication Date: 2019-03-27
• Subjects: grain refinement -- Ti/TiCN refiner -- heterogeneous nucleation -- pure aluminum; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab0e3c
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: The refinement effect of titanium carbonitride on pure aluminum was investigated by adding the mixed powder of Ti and TiCN. Comparing with adding Ti or TiCN separately, 0.3% addition of the mixed refiner of Ti and TiCN has better grain refinement performance and the grain size of pure aluminium can decrease to 120 μ m. With the prolongation of holding time, the pure aluminum with TiCN/Ti showed excellent anti-fading performance which can still maintain fine equiaxed grains (180 μ m) after holding 8 h. The charictaristics of refined specimens were revealed by OM, FSEM, XRD, and DCS test and the results suggest that TiCN with Ti-rich layer in aluminum melt can reduce undercooling and act as heterogeneous nucleus of α -Al. The refinement mechanism of the composite refiner is the formation of Ti-rich layer on the interface of TiCN which promotes the nucleation of α -Al.