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Metals 2018, 8(3), 194; https://doi.org/10.3390/met8030194

Effect of Trace Be and Sc Additions on the Mechanical Properties of A357 Alloys

1
Department of Power Vehicle and Systems Engineering, CCIT, National Defense University, Taoyuan 320-338, Taiwan
2
Materials and Electro-Optics Research Division, National Chung-Shan Institute of Science and Technology, Taoyuan 320-338, Taiwan
3
Department of Mechanical Engineering, National Central University, Taoyuan 320-338, Taiwan
*
Author to whom correspondence should be addressed.
Received: 8 February 2018 / Revised: 13 March 2018 / Accepted: 17 March 2018 / Published: 19 March 2018
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Abstract

The effect of the addition of Be and Sc on the microstructure and mechanical properties of A357 alloy were systematically investigated. The results show that the addition of small amounts of Be and Sc could change the acicular structure of iron-bearing intermetallic compounds to harmless compact Al-Fe-Si and Sc-Fe iron-bearing intermetallic compounds. Compact iron-bearing intermetallic compounds could improve fluidity, causing a reduction in interdendritic shrinkage during solidification. The addition of 0.05 wt % Be enhanced the quality index of the A357 alloy by 11% and increased the notch-yield ratio of fracture toughness by 4.5%. In contrast, the addition of 0.05 wt % Sc increased the quality index and the notch to yield ratio of fracture toughness up to 17% and 9%, respectively. Therefore, the microstructure and mechanical properties of the A357 alloy could be improved by substituting Be with Sc. View Full-Text
Keywords: A357 alloy; scandium; microstructure; mechanical properties A357 alloy; scandium; microstructure; mechanical properties
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Tzeng, Y.-C.; Nieh, J.-K.; Bor, H.-Y.; Lee, S.-L. Effect of Trace Be and Sc Additions on the Mechanical Properties of A357 Alloys. Metals 2018, 8, 194.

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