Al-5Er-Ti Master Alloy with Both Grain Refinement and Microalloying Effects
The phase structure, grain refinement, and microalloying effect of the Al-5Er-Ti master alloy were analyzed by a refining experiment, microhardness test, OM, SEM, and XRD. The results show that when the Er/Ti atomic ratio is 2.7, the refining effect of the Al-5Er-0.5Ti master alloy is significantly...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/1/43 |
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| Summary: | The phase structure, grain refinement, and microalloying effect of the Al-5Er-Ti master alloy were analyzed by a refining experiment, microhardness test, OM, SEM, and XRD. The results show that when the Er/Ti atomic ratio is 2.7, the refining effect of the Al-5Er-0.5Ti master alloy is significantly better than Al-5Er, which is due to the Ti<sub>2</sub>Al<sub>20</sub>Er phase. There are three crystal orientations of Ti<sub>2</sub>Al<sub>20</sub>Er and α-Al that satisfy the E2E model, among which (620)<sub>Ti2Al20Er</sub><260><sub>Ti2Al20Er</sub>//(111)<sub>Al</sub><110><sub>Al</sub> is the least mismatched one. When the Er/Ti atomic ratio is reduced to below 1.3, the Ti-containing phase of the Al-5Er-Ti master alloy is composed of Ti<sub>2</sub>Al<sub>20</sub>Er and Al<sub>3</sub>Ti. The primary phase size of the Al-5Er-1.5Ti master alloy decreases with the increase in cooling rate, and the grain refining effect improved more significantly. The optimum size of the Ti<sub>2</sub>Al<sub>20</sub>Er phase and Al<sub>3</sub>Ti phase is 6.0 μm and 9.5 μm, respectively. The grain size of pure aluminum is reduced from 14,000 μm to 300 μm by Al-5Er-1.5Ti master alloy refinement, and the refinement rate is 97.9%. Direct aging of the refined sample did not have a precipitation strengthening effect. After the solution and aging treatment, the peak aging of the refined sample was reached in 15 min, and the microhardness increased by 41%. |
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| ISSN: | 2075-4701 |