Effect of Ti Addition and Electric Field on Microstructure and Mechanical Properties of the Al-Si-Fe Hypereutectic Alloy

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strength of Materials Pub Date : 2024-07-24 DOI:10.1007/s11223-024-00656-2

Q. L. Wang, L. Wang, F. Yang, J. Wang, L. Y. Sheng

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Abstract

In the present research, the Al-Si-Fe hypereutectic alloys with different Ti addition were prepared and the electric field treatment was performed on the alloys to regulate the phase morphology. The microstructure and mechanical properties of the alloys were characterized by OM, SEM, TEM, EPMA and tensile test. The results reveal that the Al-Si-Fe hypereutectic alloy prepared by conventional casting is mainly composed cubic β-Si phase, long rod-like and needle-like β-Al₅FeSi phases. In addition, there are stacking faults in the β-Al₅FeSi phase. Minor Ti addition in Al-Si-Fe hypereutectic alloy could change the needle-like phase into eutectic structure, decrease the size of β-Al₅FeSi phase and homogenize the β-Si phase size. The more Ti addition tends to coarsen the β-Al₅FeSi and β-Si phases, and moreover the needle-like phase precipitate again. The electric field treatment promotes the coarsening of β-Al₅FeSi and β-Si phases in the Al-Si-Fe hypereutectic alloy with 0-1.0 wt.% Ti addition, but results in the refinement of β-Al₅FeSi and β-Si phases in 1.5 wt.% Ti doped Al-Si-Fe hypereutectic alloy. Furthermore, the needle-like phase has been transformed into small-size eutectic structure in the 1.0 and 1.5 wt.% Ti doped Al-Si-Fe hypereutectic alloys. With the synergistical effect of Ti addition and electric field treatment, the 1.5 wt.% Ti doped Al-Si-Fe hypereutectic alloy obtains yield strength of 100 MPa and ultimate tensile strength of 113 MPa, which is about 26% and 37% higher than the conventional-cast Al-Si-Fe hypereutectic alloy.

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添加钛和电场对 Al-Si-Fe 共晶合金微观结构和机械性能的影响

在本研究中，制备了添加不同钛元素的 Al-Si-Fe 共晶合金，并对合金进行了电场处理以调节相形态。通过 OM、SEM、TEM、EPMA 和拉伸试验对合金的微观结构和力学性能进行了表征。结果表明，传统铸造法制备的 Al-Si-Fe 超共晶合金主要由立方体 β-Si 相、长棒状和针状 β-Al5FeSi 相组成。此外，β-Al5FeSi 相中还存在堆叠断层。在铝-硅-铁低共晶合金中少量添加 Ti 可使针状相转变为共晶结构，减小 β-Al5FeSi 相的尺寸，并使β-Si 相的尺寸均匀化。钛的添加量越多，β-Al5FeSi 和 β-Si 相越趋于粗化，而且针状相再次析出。在钛添加量为 0-1.0 wt.% 的铝硅铁超共晶合金中，电场处理促进了β-Al5FeSi 和 β-Si 相的粗化，但在钛添加量为 1.5 wt.% 的铝硅铁超共晶合金中，电场处理导致了β-Al5FeSi 和 β-Si 相的细化。此外，在掺杂 1.0 和 1.5 wt.% Ti 的 Al-Si-Fe 共晶合金中，针状相已转变为小尺寸共晶结构。在添加钛和电场处理的协同作用下，掺杂 1.5 重量%钛的铝硅铁超共晶合金获得了 100 兆帕的屈服强度和 113 兆帕的极限抗拉强度，比传统铸造的铝硅铁超共晶合金分别高出约 26% 和 37%。

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来源期刊

Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.