Effect of Barothermal Processing on the Solid-State Formation of the Structure and Properties of 16 at % Si–Al Hypereutectic Alloy
- 作者: Dedyaeva E.V.1, Zaitsev D.V.2, Lukina E.A.2, Nikiforov P.N.3, Padalko A.G.1, Talanova G.V.1, Solntsev K.A.1
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隶属关系:
- Baikov Institute of Metallurgy and Materials Science
- All-Russia Research Institute of Aviation Materials (Russian Federation State Scientific Center)
- Ufa Engine Industrial Association Public Joint Stock Company
- 期: 卷 54, 编号 2 (2018)
- 页面: 125-132
- 栏目: Article
- URL: https://journals.rcsi.science/0020-1685/article/view/158402
- DOI: https://doi.org/10.1134/S0020168518020024
- ID: 158402
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详细
We describe barothermal processing (hot isostatic pressing) of a 16 at % Si–Al binary alloy for 3 h at a temperature of 560°C and pressure of 100 MPa for 3 h, in combination with measurements of heat effects during cooling. The results demonstrate that this processing leads to the fragmentation of the silicon structural constituent and ensures a high degree of homogenization of the as-prepared alloy. Heat treatment of the 16 at % Si–Al alloy at 560°C and a pressure of 100 MPa leads to a thermodynamically driven enhanced silicon dissolution, up to ~10 at %, in the aluminum matrix, resulting in the formation of a supersaturated solid solution, which subsequently decomposes during cooling. We analyze the complete porosity elimination process, which makes it possible to obtain a material with 100% relative density. According to differential barothermal analysis, microstructural analysis, and scanning and transmission electron microscopy data, barothermal processing of the 16 at % Si–Al alloy produces a bimodal size distribution of the silicon phase constituent: microparticles 3.6 μm in average size and nanoparticles down to ~1 nm in diameter. The Al matrix has been shown to contain a high density of edge dislocations. Barothermal processing reduces the thermal expansion coefficient and microhardness of the hypereutectic alloy. We conclude that solid-state barothermal processing is an effective tool for completely eliminating microporosity from the 16 at % Si–Al alloy, reaching a high degree of homogenization, and controlling the microstructure of the alloy, in particular by producing high dislocation density in the aluminum matrix.
作者简介
E. Dedyaeva
Baikov Institute of Metallurgy and Materials Science
Email: padalko@inbox.ru
俄罗斯联邦, Leninskii pr. 49, Moscow, 119334
D. Zaitsev
All-Russia Research Institute of Aviation Materials (Russian Federation State Scientific Center)
Email: padalko@inbox.ru
俄罗斯联邦, ul. Radio 17, Moscow, 105005
E. Lukina
All-Russia Research Institute of Aviation Materials (Russian Federation State Scientific Center)
Email: padalko@inbox.ru
俄罗斯联邦, ul. Radio 17, Moscow, 105005
P. Nikiforov
Ufa Engine Industrial Association Public Joint Stock Company
Email: padalko@inbox.ru
俄罗斯联邦, ul. Ferina 2, Ufa, 450039
A. Padalko
Baikov Institute of Metallurgy and Materials Science
编辑信件的主要联系方式.
Email: padalko@inbox.ru
俄罗斯联邦, Leninskii pr. 49, Moscow, 119334
G. Talanova
Baikov Institute of Metallurgy and Materials Science
Email: padalko@inbox.ru
俄罗斯联邦, Leninskii pr. 49, Moscow, 119334
K. Solntsev
Baikov Institute of Metallurgy and Materials Science
Email: padalko@inbox.ru
俄罗斯联邦, Leninskii pr. 49, Moscow, 119334
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