Acta Metall Sin  1998, Vol. 34 Issue (3): 237-241    DOI:

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MICROSTRVCTURE AND SOLIDIFICATION BEHMIOUR OF Ni_3Al/Ni_7Hf_2 EUTECTIC ALLOY

MA Shuwei; ZHENG Yunrong(Beijing Institute of Aeronautical Materials; Beijing 100095)DU Wei; WEI Pengyi; LI Jianguo; FU Hengzhi(The State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072)

MA Shuwei; ZHENG Yunrong(Beijing Institute of Aeronautical Materials; Beijing 100095)DU Wei; WEI Pengyi; LI Jianguo; FU Hengzhi(The State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072). MICROSTRVCTURE AND SOLIDIFICATION BEHMIOUR OF Ni_3Al/Ni_7Hf_2 EUTECTIC ALLOY. Acta Metall Sin, 1998, 34(3): 237-241.

Abstract References Related Articles Recommended Metrics Download:  PDF(2019KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The Ni3Al+Ni7HfZ unidirectionally soliditied lamellar eutectic has been studied to improve the transversal ductility and interface-thermal-stability of the ordinary eutectic composites in situ. The microstructure of Ni-5.8Al-32Hf (mass fraction,%) alloy was investigated in detail by means of metallography, transmission electron microscopy (TEM) and electron probe. The solidification behaviour of Ni3Al+Ni7Hf2 eutectic alloy was investigated at different temperature gradient (G) and solidilication rate (R). The results show that Ni-5.8Al-32Hf alloy with Ni3Al+Ni7Hf2 eutectic structure is considered to be the proper compositon. Some brittle β-NiAl phase in the alloy can be avoided by decreasing soliditied rate. Melting range of the alloy above mentioned composition is 41℃ determined by DTA. The critical value of G/R for NisAl+Ni7Hf2 eutectic is 5×105 ℃·s/cm2, and the lamellar Ni3Al+Ni7Hf2 eutectic aligned parallel to the direction of solidilication was obtained under R=5μm/s and G=250℃/cm. Key words:  unidirectionally solidilication      in situ composite      Ni3Al/Ni7Hf2 eutectic      microstructure      Received:  18 March 1998      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I3/237 1Menzies R G.In:Duhl D N ed., Superalloys 1998,6th Int Symp on Superalloys, Champion,Pennsylvania,1988,Warrendale,PA:Metall Soc,1988:355 2Bibring H,Khan T,Rabinovith M,Stohr J.In:Kear B H ed., Superalloys Metallurgy and Manufacture,3rd Int Symp, Champion,Pennsylvania,1976,Claiter's Publishing Division,1976:331 3Rawlings R D, Staon A E.J Mater Sci,1975;10:505 4Ball A,Smallman R E.Acta Metall ,1966;14:1517 5Nash P,West D R F.Met Sci,198;15:347 [1] ZHANG Leilei, CHEN Jingyang, TANG Xin, XIAO Chengbo, ZHANG Mingjun, YANG Qing. Evolution of Microstructures and Mechanical Properties of K439B Superalloy During Long-Term Aging at 800oC[J]. 金属学报, 2023, 59(9): 1253-1264. 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