MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ni3Al-BASED SINGLE CRYSTSAL ALLOY IC21

doi:10.11900/0412.1961.2015.00434

Acta Metall Sin

2015, Vol. 51

Issue (10): 1279-1287 DOI: 10.11900/0412.1961.2015.00434

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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ni₃Al-BASED SINGLE CRYSTSAL ALLOY IC21

Haigen ZHAO,Shusuo LI,Yanling PEI,Shengkai GONG(

),Huibin XU

School of Materials Science and Engineering, Beihang University, Beijing 100191

Cite this article:

Haigen ZHAO,Shusuo LI,Yanling PEI,Shengkai GONG,Huibin XU. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ni₃Al-BASED SINGLE CRYSTSAL ALLOY IC21. Acta Metall Sin, 2015, 51(10): 1279-1287.

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Abstract

According to the requirement of high-pressure turbine guide vane during service, the aim of this work is to design a single crystal Ni₃Al-based alloy named IC21 with low density, low cost, and high strength which can be used as high-pressure turbine guide vane material. The mass fraction of the Re has been limited less than 1.5% on purpose. The single crystal bars of IC21 were prepared by high rate solidification method. The density of IC21 is 8.0 g/cm³ and the incipient melting temperature was identified by metallography. After standard heat treatment, the distribution of the g' precipitates is uniform with the average size of about 420 nm, and volume fraction of 80%. The tensile and yield strengths at 1100 ℃ are 490 and 470 MPa, respectively. Moreover, IC21 shows superior creep properties, the stress-rupture life at 1100 ℃,140 MPa is 170.5 h and at 1150 ℃,100 MPa still remains 110.0 h. The microstructure stability of IC21 alloy at 1080 ℃ for as long as 1000 h were evaluated. The results show that no precipitated phase exists during thermal exposure at 1080 ℃, which exhibits good stability. The oxidation kinetic curves of IC21 alloy follows a parabolic rate law in different oxidation stage during cycle oxidation for 100 h in air. IC21 alloy has a good high temperature oxidation resistance, the strengthening mechanism are attributed to high volume fraction of g' phase, large negative misfit and well-established interface networks.

Key words: Ni₃Al IC21 single crystal alloy low cost low density high temperature strength high temperature oxidation resistance

Fund: Supported by National Natural Science Foundation of China (No.51371014) and Joint Funds of National Natural Science Foundation of China (No.U1435207)

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	Haigen ZHAO
	Shusuo LI
	Yanling PEI
	Shengkai GONG
	Huibin XU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00434 OR https://www.ams.org.cn/EN/Y2015/V51/I10/1279

Fig.1 Cross- (a) and longitudinal- (b) sectional BSE images of as-cast IC21 single crystal alloy and partially enlarged views of Fig.1a (c) and Fig.1b (d)

Fig.2 SEM images of IC21 single crystal alloy after different aging treatment^[13]
(a) 1060 ℃, 2 h+870 ℃, 32 h (b) 1080 ℃, 2 h+870 ℃, 32 h
(c) 1100 ℃, 2 h+870 ℃, 32 h (d) 1120 ℃, 2 h+870 ℃, 32 h

Fig.3 SEM images of IC21 alloy after thermal exposure at 1080 ℃ for 50 h (a), 100 h (b), 300 h (c), 500 h (d), 800 h (e) and 1000 h (f)^[13]

Table 1 Tensile properties of IC21 single crystal alloy at various temperatures^[13]

Fig.4 Influence of temperature on yield strength and elongation of CMSX-4 and IC21 single crystal alloys^[21]

Fig.5 Dislocation networks of IC21 single crystal alloy formed during high temperature thermal exposure at 1100 ℃ for 1 h at low (a) and high (b) magnification, 10 h (c) and 100 (d)^[13,27]

Table 2 Stress rupture properties of IC21 single crystal alloy at various load conditions^[13]

Fig.6 Cyclic oxidation mass gain kinetic curves of IC21 single crystal alloy at 1100 ℃ (a) and 1150 ℃ (b)

Fig.7 Microstructure of complex thin-walled IC21 single crystal alloy (a) and enlarged views corresponding to areas A (b), B (c) and C (d) in Fig.7a

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