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Acta Metall Sin  2019, Vol. 55 Issue (9): 1067-1076    DOI: 10.11900/0412.1961.2019.00148
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Application and Research of Typical Intermetallics-Based High Temperature Structural Materials in China
GONG Shengkai1(),SHANG Yong1,ZHANG Ji2,GUO Xiping3,LIN Junpin4,ZHAO Xihong5
1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2. High Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China
3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
4. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
5. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Abstract  

Intermetallics is composed of two or more metals or of a metal and a nonmetal. The coexistence of covalent and metal bond makes the intermetallic compound have long-term ordered superlattice structure, which greatly reduces dislocation mobility at high temperature, thus exhibiting good high-temperature strength. Typical structural intermetallics such as Ti-Al, Ni-Al and Nb-Si, have the advantages of excellent high-temperature strength and low density, which are very suitable for high-temperature structural parts of aerospace. However, the application of such materials is limited by low fracture toughness at room temperature and poor oxidation resistance at high temperature, which attracts more and more attentions and brings challenges in this field. In this paper, the research and application status in high-temperature strengthening, toughening, oxidation resistance and preparation technology of Ti-Al, Ni-Al, Nb-Si intermetallics-based alloys are introduced.

Key words:  intermetallics      high-temperature resistance      mechanical property      alloying design      oxidation resistance     
Received:  07 May 2019     
ZTFLH:  TG113.1  
Fund: Supported by National Natural Science Foundations of China(51671015、51771007);National Science and Technology Major Project(2017-VI-0011-0083、2017-VI-0012-0084)
Corresponding Authors:  Shengkai GONG     E-mail:  gongsk@buaa.edu.cn

Cite this article: 

GONG Shengkai, SHANG Yong, ZHANG Ji, GUO Xiping, LIN Junpin, ZHAO Xihong. Application and Research of Typical Intermetallics-Based High Temperature Structural Materials in China. Acta Metall Sin, 2019, 55(9): 1067-1076.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00148     OR     https://www.ams.org.cn/EN/Y2019/V55/I9/1067

Fig.1  The duplex (a) and near fully lamellae (b) microstructures in TiAl-Nb alloy after rolling (ND—normal direction, RD—rolling direction)
Fig.2  XRD spectra of the cast TiAl-Nb alloys with different Al contents (a) and comparison of the Larson-Miller creep parameter of studied alloys (T—temperature, tf—time, P—Larson-Miller parameter) (b)
Fig.3  Microstructures in rolled bars of Ti-22Al-25Nb alloy (?300 mm) for eight times of forging (a) and five times of forging (b)
Fig.4  Microstructures of IC21 alloy before heat-treatment (a), after full heat treatment (b) and after thermal exposure at 1200 ℃ for 2 h (c)
Fig.5  Cyclic oxidation weight gain curves of IC21 at 1100 ℃ (a) and the creep curve of IC21[111] at 1100 ℃ under 137 MPa (Insets show the morpholoyies of alloys at different time) (b)
ElementConstituent phaseOxidation resistanceMechanical property
Ti, Hf, ZrPromoting theImproving the oxidationHf and Zr enhance the fracture toughness and high
formation ofresistancetemperature strength, and Ti also enhances the fracture
γ-Nb5Si3toughness, but excessive Ti content degrades the high-
temperature creep resistance of the alloys
Mo, W, AlImproving theW and Al improve theMo enhances the fracture toughness and high temperature
stability of β-Nb5Si3oxidation resistance,strength; W improves the high temperature strength; Al
while Mo degrades ithas negative impact on mechanical properties
CrPromoting theImproving the oxidationDeteriorating the fracture toughness of the alloys
formation ofresistance
Cr2Nb
Rare earth-Improving the oxidationImproving the fracture toughness of the alloys
resistance
Table 1  The effects of alloying elements on the constituent phases and properties of Nb-Si based alloys[44,45,46,47,48,49,50,51,52,53,54,55,56,57,58]
Fig.6  Longitudinal (a) and transverse (b) microstructures of Nb-15Si-22Ti-5Cr-3Al-3Hf alloy integrally directionally solidified at 2050 ℃ and a withdrawal rate of 200 μm/s
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