Acta Metall Sin  2011, Vol. 47 Issue (1): 88-94    DOI: 10.3724/SP.J.1037.2010.00434

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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Nb-16Si-22Ti--2Hf--2Cr--2Al INGOT PREPARED BY VACUUM INDUCTION MELTING

JIA Lina, GAO Ming, GE Jingru, ZHENG Lijing, SHA Jiangbo, ZHANG Hu

School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191

JIA Lina GAO Ming GE Jingru ZHENG Lijing SHA Jiangbo ZHANG Hu. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Nb-16Si-22Ti--2Hf--2Cr--2Al INGOT PREPARED BY VACUUM INDUCTION MELTING. Acta Metall Sin, 2011, 47(1): 88-94.

Abstract References Related Articles Recommended Metrics Download:  PDF(1464KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The melt with a nominal composition of Nb-16Si-22Ti-2Hf-2Cr-2Al was poured in a ceramic shell mould with a temperature gradient of about 4℃/mm, and the ingot with the dimension of 60 mm×170 mm was obtained. The relationship between the microstructure and mechanical properties was measured, and the effects of the silicide on fracture toughness at ambient temperature and compression strength at high temperature were analyzed. It is revealed that the microstructure of the alloy consists of Nb solid solution and silicides, and the cooling rate can obviously change primary phase and constituent phases. The volume fraction of Nb3Si formed at rapid cooling rate is significantly increased, and Nb5Si3 phase is formed with decreasing in cooling rate, whereas the volume fraction of the eutectic colonies and NbSS dendrites increase evidently, especially the second dendrite arm. Fine and uniform eutectic colonies are contributed to the ambient tensile strength, while the coarse primary Nb3Si decreases the tensile strength but improves the compression strength of the alloy. When the microstructure is mainly composed of fine (NbSS+Nb5Si3) eutectic colonies, the tensile strength and elongation of the alloy reach 449 MPa and 0.3%, respectively. When lath-like Nb3Si phase has 80 $\mu$m in width and 50% in volume fraction as well as its long axis is parallel to compression direction, the compression strength of the alloy at 1250℃ is about 650 MPa. Key words:  Nb-Si base alloy      vacuum induction melting      microstructure      tensile strength      high temperature compression strength      Received:  31 August 2010      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors GU Li-Na GAO Meng GE Jing-Ru SUO Jiang-Bei ZHENG Li-Jing ZHANG Hu URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00434     OR     https://www.ams.org.cn/EN/Y2011/V47/I1/88 [1] Bewlay B P, Jackson M R, Lipsitt H A. Metall Mater Trans, 1996; 27A: 3802 [2] Guan P, Guo X P, Ding X, Zhang J, Gao L M. Acta Metall Sin, 2004; 17: 450 [3] Bewlay B P, Jackson M R, Subramanian P R. JOM, 1999; 51: 32 [4] Yao C F, Guo X P, Guo H S, Li Y K. J Mater Eng, 2007; 1: 165 (姚成方, 郭喜平, 郭海生, 李永凯. 材料工程, 2007; 1: 165) [5] Yang L L, Huang Y, Li X J, Zheng L J, Zhang H. Spec Cast Nonferrous Alloys, 2009; 26: 500 (杨莉莉, 黄 燕, 李小溅, 郑立静, 张虎. 特种铸造及有色合金, 2009; 26: 500) [6] Jia L N, Li X J, Sha J B, Zhang H. 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