超聲對熔鹽電解法制備Al-7Si-Sc合金組織的影響

郭志超; 劉軒; 薛濟來; 張鵬舉

doi:10.13374/j.issn2095-9389.2019.09.004

超聲對熔鹽電解法制備Al-7Si-Sc合金組織的影響

doi: 10.13374/j.issn2095-9389.2019.09.004

北京科技大學冶金與生態工程學院, 北京 100083

基金項目:

國家自然科學基金資助項目 51434005

國家自然科學基金資助項目 51704020

國家自然科學基金資助項目 51874035

北京市自然科學基金資助項目 2184110

詳細信息

通訊作者:
薛濟來, E-mail: jx@ustb.edu.cn

中圖分類號: TS912⁺.3
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出版歷程
- 收稿日期: 2019-01-29
- 刊出日期: 2019-09-01

Effects of ultrasound on the microstructure of Al-7Si-Sc alloy prepared via molten salt electrolysis

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

More Information

Corresponding author: XUE Ji-lai, E-mail: jx@ustb.edu.cn

摘要

摘要: Al-Si系合金在現代工業、交通等領域廣泛應用，合金元素鈧可進一步改善其加工和使用性能.采用超聲協同熔鹽電解法制備Al-7S-Sc三元合金，研究探索超聲作用對合金組織及強化相分布的影響.發現超聲協同熔鹽電解制得合金中Sc含量提高，團簇共晶硅組織和AlSi₂Sc₂相顯著細化，共晶硅團簇尺寸由約500降低至200 μm，減小約60%，細化后AlSi₂Sc₂相分布均勻.超聲協同電解法可顯著優化Al-7Si-Sc合金組織，有助于控制改善現行工藝中合金元素偏聚、組織不均勻現象.
- Al-Si合金 /
- 共晶硅 /
- AlSi₂Sc₂ /
- 超聲波 /
- 熔鹽電解法
Abstract: Al-Si alloys are widely used in modern industries, transportation, and other engineering applications. Processability and mechanical properties of Al-based alloys can be improved via the addition of scandium. Sc added to Al metal for fabricating Sc-containing Al alloys using molten salt electrolysis has been recently considered as promising technology. However, alloying elements, such as Sc and Si are often unevenly distributed in such Al-based alloys. In this study, Al-7Si-Sc ternary alloy was prepared via molten salt electrolysis aided with ultrasound to investigate the effects of ultrasound on the microstructure and distribution of the strengthening phase. Electrolysis was performed on molten salts of Na₃AlF₆-19%KF-29%AlF₃-2%CaF₂ at a temperature of 800℃ and current density of 1 A·cm², in which Sc₂O₃ (99.99% purity) and Al-7Si alloy served as the raw material and cathodic metal, respectively. Ultrasound (20 kHz, 200 W) was introduced into the cathode metal from the cell bottom. Sc contents in the as-prepared alloy samples were determined using inductively coupled plasma atomic emission spectrometry (ICP-AES). Microstructures of the alloy samples were characterized using optical microscope and scanning electron microscope coupled with an energy dispersive X-ray analyzer. Results reveal that ultrasound can increase Sc content in the ternary alloy prepared via molten salt electrolysis and refine the eutectic silicon clusters and the ternary AlSi₂Sc₂ phase. Compared with the alloys made without ultrasound aid, the silicon cluster size decreases from approximately 500 to 200 μm (~60%) and the refined ternary phase of AlSi₂Sc₂ uniformly distributes in the metal matrix. Results also indicate that ultrasound can considerably optimize the microstructure of Al-7Si-Sc alloy prepared via molten salt electrolysis. This process can prevent problems such as the segregation of alloying elements and uneven microstructures observed when using the traditional alloy-making process.
- Al-Si alloy /
- eutectic silicon /
- AlSi₂Sc₂ /
- ultrasound /
- molten salt electrolysis

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圖 1 超聲協同熔鹽電解設備示意圖

Figure 1. Schematic of molten salt electrolysis equipment assisted by ultrasound

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圖 2 合金中共晶硅形貌及共晶硅片層厚度分布. (a)Al-7Si；(b)電解；(c)電解-超聲

Figure 2. Morphology and thickness of eutectic silicon phase in different alloys: (a) Al-7Si alloy; (b) electrolytic alloy; (c) ultrasonic-aided electrolytic alloy

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圖 3 合金中AlSi₂Sc₂相及其能譜

Figure 3. AlSi₂Sc₂ phase in the alloy and corresponding energy spectrum

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圖 4 含長條狀AlSi₂Sc₂相區域元素分布面掃圖

Figure 4. EDS mapping of the area containing long AlSi₂Sc₂ phase

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圖 5 電解(a, b)與超聲-電解(c, d)合金中底、中部AlSi₂Sc₂的分布

Figure 5. Distribution of AlSi₂Sc₂ in the bottom and middle areas of electrolytic alloy (a, b) and ultrasonic assisted electrolytic alloy (c, d)

下載: 全尺寸圖片幻燈片

表 1 電解與電解-超聲處理下Al-7Si-Sc合金中鈧質量分數

Table 1. Sc mass fraction of electrolytic alloys treated with and without ultrasound ?%

制備方法	No.1	No.2	No.3	均值
電解	1.20	1.14	1.11	1.15
電解-超聲	1.52	1.47	1.45	1.48

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