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Metals 2017, 7(5), 172; doi:10.3390/met7050172

Grain Refinement Mechanism of the As-Cast and As-Extruded Mg–14Li Alloys with Al or Sn Addition

1
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
3
Chongqing Research Center for Advanced Materials, Chongqing Academy of Science and Technology, Chongqing 401123, China
*
Author to whom correspondence should be addressed.
Academic Editors: Ali Ramazani and Veera Sundararaghavan
Received: 13 April 2017 / Revised: 8 May 2017 / Accepted: 9 May 2017 / Published: 13 May 2017
(This article belongs to the Special Issue Microstructure based Modeling of Metallic Materials)
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Abstract

The microstructures of the as-cast and as-extruded Mg–14 wt. % Li–1 wt. % Al (LA141) and Mg–14 wt. % Li–2 wt. % Sn (LT142) were observed by optical and scanning electron microscope (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The effects of Al and Sn on the grain refinement on the Mg–14Li alloy were investigated. In addition, the mechanism of grain refinement on the as-cast and as-extruded alloys was discussed from the view of the solute effect and heterogeneous nucleation effect via edge-to-edge matching model. The results showed that the average grain sizes of the as-cast LA141 and LT142 alloys were similar due to the close solute effect of 1.1 wt. % Al and 1.8 wt. % Sn, while, in the as-extruded alloys, the average grain size of LT142 was over two times finer than that of LA141. This was attributed to the reason that Li2MgSn particles can serve as heterogeneous nucleation sites for the β-Li matrix during the process of dynamic recrystallization (DRX), but LiMgAl2 cannot serve the same way. Therefore, Sn can act as a more effective grain refiner for the Mg–14Li alloy compared to Al. View Full-Text
Keywords: magnesium–lithium (Mg–Li) alloy; grain refinement; heterogeneous nucleation; edge-to-edge matching model magnesium–lithium (Mg–Li) alloy; grain refinement; heterogeneous nucleation; edge-to-edge matching model
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Zeng, Y.; Jiang, B.; Li, R.; Yin, H.; Al-Ezzi, S. Grain Refinement Mechanism of the As-Cast and As-Extruded Mg–14Li Alloys with Al or Sn Addition. Metals 2017, 7, 172.

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