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Microstructure and Mechanical Properties of Al-Si Alloy Reinforced by Al 63 Cu25 Fe12 Quasicrystal

Author: LiZuoYuan
Tutor: GengHaoRan
School: Jinan University
Course: Materials Science
Keywords: Conventional casting Al63Cu25Fe12 quasicrystals Al-Si alloy Strengthen Mechanical Properties
CLC: TG146.21
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


Conventional casting methods and rapid solidification prepared the Al 63 Cu 25 the Fe 12 alloy. The Al 63 Cu 25 Fe 12 the alloy ingot rapidly solidified state Al of 63 Cu 25 Fe 12 alloy ribbon were SEM-EDS, X-ray diffraction and DSC analysis, was successfully prepared by the heat treatment consists essentially the single phase consisting of Al of 63 Cu 25 Fe 12 quasicrystal alloy. The heat after Al 63 Cu 25 the of Fe 12 quasicrystals crushed into particles of a certain size, was added to the different addition amount of Al-7 % Si and Al-12.6% Si alloy strengthening treatment. By different holding time of quasicrystalline phase change in the matrix alloy and analysis of the impact of the organization and performance of the quasi-BMG Jin Duiji alloy. The tests showed that the X-ray diffraction analysis by SEM-EDS, in the electric arc furnace melting and solidification of Al 63 Cu 25 Fe 12 alloy casting The ingot tissue mainly composed of four kinds of phase composition, is λ, respectively, β-phase, I phase of the quasicrystals and τ phase, and, in the process of solidification of the sequentially precipitated. Determined by DSC, τ phase, quasicrystals I, β-phase, and λ-phase transition temperature of 692 ° C, 880 ° C, 996 ° C and 1117 ° C. Al 63 Cu 25 Fe 12 alloy thin strip rapidly solidified state prepared by copper roller spin quenching system, fast-setting state alloy thin The band is primarily by a large amount of the quasicrystalline I-phase and a small amount of τ phase composition. Solidification speed on Al 63 Cu 25 Fe 12 quasicrystal alloy phase composition has important implications. Under the protection of argon, after 750 ° C, 3 hour heat treatment and quenching, Al 63 Cu 25 the Fe 12 alloy ingots basic by a single quasicrystalline phase. The the Al 63 Cu 25 the Fe 12 quasicrystalline particles added to the mechanical stirring casting method to Al-7% Si alloy. With the increase of the added amount of the quasicrystal particles around the grain boundary of the matrix alloy quasicrystal particles increased significantly, and evenly distributed along the grain boundaries no obvious agglomeration, particle size has been reduced significantly. The quasicrystalline particles dispersed in the matrix with the holding time, the thermal cracking and low temperature τ phase generated. With the further extension of the holding time, the quasicrystalline particles completely dissolved, the formation of many new phase of each element of the quasi-crystalline phase and the matrix alloy, and scattered within the matrix alloy. Mechanical properties test results show that, as the Al 63 Cu 25 Fe 12 quasicrystalline particles increased quasicrystal reinforced Al-7% Si alloy The gradual increase in hardness and tensile strength, elongation essentially unchanged, when the quasicrystal add more than 6%, the elongation gradual downward trend, therefore, when adding 6% The quasicrystals enhanced the mechanical properties of the alloy. Same method the Al 63 Cu 25 Fe 12 quasicrystalline particles are added to the Al-12.6% Si alloy. Compared with the Al-12.6% Si alloy, eutectic Si has been obvious refinement quasicrystalline particles exist in long strips and massive. Add a small amount of the quasicrystal quasicrystalline particles and refinement of eutectic Si dispersed in the matrix alloy. As the quasicrystals content increases, the quasicrystalline particles agglomeration. With the extension of the holding time, the quasicrystalline particles gradually dissolved, and the elements of the quasicrystalline phase diffusion and with the formation of many new phase in the matrix alloy. The results of the mechanical properties of quasicrystal reinforced Al-12.6% Si alloy hardness increased with the increase of the added amount of the quasicrystal. Elongation add a small amount of quasicrystals remains the same downward trend, When quasicrystals add greater than 3%, the elongation. Add the amount of tensile strength with quasicrystalline quasicrystalline reinforced Al-12.6% Si alloy first increases and then decreases. When amount of quasicrystals 6%, the tensile strength reached a maximum. And enhancement of 3% Al-12.6% Si alloy the unreinforced of Al-12.6% Si quasicrystal dosage of 500 ± 5 ℃ solid solution and quenching treatment at 185 ± 5 ℃ 24 hours of artificial aging, quasicrystals enhanced Al-12.6% Si alloy the unreinforced of Al-12.6% Si alloy hardness are subject to increase in the efficiency of time first increases and then decreases slowly, a more significant time peak. The quasicrystals enhanced Al-12.6% Si alloy than unreinforced Al-12.6% Si alloy has a higher hardness, but there is also a the aging peak time period of time forward.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Aluminum
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