Flow Cessation Mechanism of β-Phase Solidification of High-Nb Tial Alloy

Abstract:

The spiral fluidity sample was poured by the liquid of Ti-45Al-8Nb-0.2W-0.25Cr alloy. The flow cessation mechanism of TiAl based alloys was investigated, and its model was built through the observation on the macrostructure of TiAl based alloys formed in the channel. The results showed that the morphology and size of the columnar crystal and equiaxial crystal changed a lot with the increase of flow length. The flow cessation mechanism of the alloy is the abundant growth of columnar crystal in the root, which causes to form the structure and finally give rise to the “necking” leading to flow cessation.

• Periodical: Materials Science Forum (Volume 1035)
• Pages: 125-133
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1035.125
• Online since: June 2021
• Authors: Zi Qi Gong*, Jin Wu, Hui Qi Du, Li Hua Chai, Zi Yong Chen
• Keywords: Flow Cessation Mechanism, Flow Model, High-Nb TiAl, Microstructure

References

[1] M. C. Flemings, E. Niyama, H. F. Taylor. Fluidity of Aluminum Alloys: An experimental and quantitative evaluation. Transactions of the American Foundrymen's Society, 1961, 69: 625-635.

[2] N. T. Reilly, B. Rouat, G. Martin, D. Daloz, Julien Zollinger. Enhanced dendrite fragmentation through the peritectic reaction in TiAl-based alloys. Intermetallics, 2017, 86: 126-133.

DOI: 10.1016/j.intermet.2017.03.022

[3] LIU Di, XUE Xiangyi, ZHOU Zhongbo ZHANG Lijun, JIAO Yong. Study of Preparation Process of High Nb-TiAl Alloy on Large Scale. Materials Reports, 2016, 30(S2): 138-140+165.

[4] Ye Rongmao, Jiang Leiguang, Jiang Zuling, Wang Huiguang. A Study on the Cessation Mechanism of Flow for Molten Metals. Materials Science and Technology, 1983(4): 5.

[5] Li Qingchun. Basis of Cast Forming Theory. China Machine Press, Beijing, 1982: 187-199.

[6] Chun-ling Bao, Shuang-qi Zhang, Yu-yan Ren, You-wei Zhang, Hua-sheng Xie, Jun Zhao. Research progress on refractory composition and deformability of shell molds for TiAl alloy castings. China Foundry, 2018, 15(1): 1-10.

DOI: 10.1007/s41230-018-7022-9

[7] Liang-shun Luo, Tong Liu, Kun Li, Yan-qing Su, Jing-jie Guo, Heng-zhi Fu. Microstructures, micro-segregation and solidification path of directionally solidified Ti-45Al-5Nb alloy. China Foundry, 2016, 13(2): 107-113.

DOI: 10.1007/s41230-016-6004-z

[8] Gong Ziqi, Chen Ziyong, Chai Lihua, xiang Zhilei, Nie Zuoren. Cyclic Oxidation Resistance of High Niobium Containing TiAl Based Alloy with Erbium. Acta Metallurgica Sinica, 2013, 49(11): 1369-1373.

DOI: 10.3724/sp.j.1037.2013.00394

[9] R. Cao, J. Zhang, Y. Haijun, J. Chen. Study on Crack Propagation Resistance of Fully Lamellar TiAl Alloy. MATERIALS SCIENCE AND ENGINEERING-HANGZHOU-, 2006, 24(3): 341.

[10] Yang Huimin, Su Yanqing, Luo Liangshun, Chen Hui, Guo Jingjie, Fu Hengzhi. Directional solidification of TiAl-based alloys: Determination of the primary phase in Ti-50Al-5Nb alloy. Rare Metal Materials and Engineering, 2011, 40(1): 1-3.

DOI: 10.1016/s1875-5372(11)60007-6

[11] Cheng Liang, Chang Hui, Tang Bin, Kou Hongchao, Li Jinshan. Simulation of microstructure for hot pack-forging of a high Nb containing TiAl Alloy. Rare Metal Materials and Engineering, 2014, 43(1): 36-41.

DOI: 10.1016/s1875-5372(14)60048-5

[12] Z. Y. Chen, Z. Q. Gong, L. H. Chai, Z. L. Xiang, Z. R. Nie. Microstructural evolution of cast TiAlNb intermetallics for third generation gas turbine components. Materials Science and Technology, 2013, 29(8): 937-942.

DOI: 10.1179/1743284713y.0000000220

[13] Yudong Chu, Jinshan Li, Fengtong Zhao, Bin Tang, Hongchao Kou. Characterization of the elevated temperature compressive deformation behavior of high Nb containing TiAl alloys with two microstructures. Materials Science and Engineering: A, 2018, 725: 466-478.

DOI: 10.1016/j.msea.2018.04.055

[14] Chen Yuyong, Yang Fei, Kong Fantao, Xiao Shulong. Constitution modeling and deformation behavior of yttrium bearing TiAl alloy. Journal of Rare earths, 2011, 29(2): 114-118.

DOI: 10.1016/s1002-0721(10)60414-0

[15] Chengcheng Shi, Kaifeng Zhang, Zhen Lu, Han Xiao. Microstructure evolution and mechanical properties of Ti46.5Al2Cr1.8Nb-(W, B) alloys fabricated by spark plasma sintering and pulse current assisted isothermal forging. Materials Science and Engineering: A, 2019, 747: 98-110.

DOI: 10.1016/j.msea.2019.01.062

[16] J. Bresler, S. Neumeier, M. Ziener, F. Pyczak, M. Göken. The influence of niobium, tantalum and zirconium on the microstructure and creep strength of fully lamellar γ/α2 titanium aluminides. Materials Science and Engineering: A, 2019, 744: 46-53.

DOI: 10.1016/j.msea.2018.11.152

[17] Qi Wang, Ruirun Chen, Yaohua Yang, Jingjie Guo, Yanqing Su, Hongsheng Ding, Hengzhi Fu. Effects of V and B, Y additions on the microstructure and creep behaviour of high-Nb TiAl alloys. Journal of Alloys and Compounds, 2018, 747: 640-647.

DOI: 10.1016/j.jallcom.2018.03.055