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Growth Behavior of Primary Intermetallic Phases and Mechanical Properties for Directionally Solidified Al-Mn-Be Alloy |
Huijun KANG1, Jinling LI1, Tongmin WANG1(), Jingjie GUO2 |
1 Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China 2 National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China |
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Cite this article:
Huijun KANG, Jinling LI, Tongmin WANG, Jingjie GUO. Growth Behavior of Primary Intermetallic Phases and Mechanical Properties for Directionally Solidified Al-Mn-Be Alloy. Acta Metall Sin, 2018, 54(5): 809-823.
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Abstract Intermetallic compounds (including quasicrystals) have been widely employed as reinforced phases in many alloys due to their high strength, high hardness and good thermal stability. The growth behavior and growth pattern of these intermetallic compounds affect the mechanical properties of materials significantly. However, the intermetallic compound, which exhibits complex crystal structures and directional bonding usually shows a faceted growth pattern with strong anisotropy and forms crystals with a wide range of morphologies and coarse grains during solidification. The inappropriate morphology and size of the intermetallic compound will destroy the integrity of the matrix and thus deteriorate the mechanical properties of materials. In this work, the microstructural evolution, morphology evolution of intermetallic compounds and mechanical properties have been investigated in directionally solidified Al-3Mn-7Be (atomic fraction, %) alloy with a wide pulling rates of 1~1500 μm/s. The addition of Be results in the shift of Al-Mn binary phase diagram toward the Mn-rich side, the appearance of intermetallic compounds, namely λ-phase, T-phase, Be4AlMn, and icosahedral quasicrystal (I-phase) and significantly refines the microstructures of the as-cast and directionally solidified samples. With increasing pulling rates, a transition of primary phase is observed from λ-phase to T-phase, and then I-phase, accompanied by the formation of the primary Be4AlMn phase, which can be attributed to the increase of supersaturation and supercooling near the solid/liquid interface. Meanwhile, the morphology, size and growth pattern of primary phases vary with the increase of pulling rates. The mechanical properties of directionally solidified Al-3Mn-7Be alloy have been investigated. It is indicated that the room-temperature strength of this alloy decreases first and then increases as the pulling rates increase, and a larger elongation is presented at the lowest and highest pulling rates, which can be attributed to the microstructures of alloys, properties of strengthening phases and the interfaces between matrix and strengthening phase.
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Received: 27 December 2017
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Fund: Supported by National Natural Science Foundation of China (Nos.51774065, 51525401, 51690163 and 51601028) |
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