Microstructure and mechanical properties of Ni<sub>3</sub>Al based intermetallic designed based on 'cluster plus connected atom' model

Liu Lin; Xu Yanan; Tian Quanwei; Teng Zongyan; Xu Zhaohui; Wang Yinong

doi:10.7513/j.issn.1004-7638.2022.05.025

Volume 43 Issue 5

Nov. 2022

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Liu Lin, Xu Yanan, Tian Quanwei, Teng Zongyan, Xu Zhaohui, Wang Yinong. Microstructure and mechanical properties of Ni3Al based intermetallic designed based on 'cluster plus connected atom' model[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 171-177. doi: 10.7513/j.issn.1004-7638.2022.05.025

Citation:

Liu Lin, Xu Yanan, Tian Quanwei, Teng Zongyan, Xu Zhaohui, Wang Yinong. Microstructure and mechanical properties of Ni₃Al based intermetallic designed based on 'cluster plus connected atom' model[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 171-177. doi: 10.7513/j.issn.1004-7638.2022.05.025

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Microstructure and mechanical properties of Ni₃Al based intermetallic designed based on 'cluster plus connected atom' model

doi: 10.7513/j.issn.1004-7638.2022.05.025

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 2022-05-16
Publish Date: 2022-11-01

Abstract

Abstract

The room temperature brittleness of Ni₃Al intermetallic compounds significantly limits its application. Accordingly, in this paper, the composition and structure of Ni₃Al intermetallic compounds are analyzed, and the composition is designed by the 'cluster plus connected atom' model. Six alloys were designed by replacing some Ni on the cluster shell with Co and Fe and replacing some connecting atom Al with Ti. Simultaneously the microstructure and mechanical properties of these alloys were characterized. The results show that the microstructures of all six alloys are composed of the Ni₃Al phase (γ′ phase), NiAl phase (BCC), and a small amount of eutectic precipitated third phase, and the formation of the Ni₃Al phase is confirmed by TEM analysis. The alloy designed in this paper has improved room temperature strength, hardness, and plasticity compared to the Ni₃Al intermetallic compound. The reason is that the formation of the Ni₃Al phase as the matrix improves the strength and hardness. When a small amount of BCC phase precipitates in the Ni₃Al matrix, it helps further to improve the strength and hardness of the alloy. In comparison, the high concentration of BCC decreased the strength and hardness and increased the plasticity.
- Ni₃Al intermetallic compound,
- "clusters plus connected atoms" model,
- phase analysis,
- mechanical properties

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References(22)

References

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