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Materials 2016, 9(4), 243; doi:10.3390/ma9040243

Influence of Li2Sb Additions on Microstructure and Mechanical Properties of Al-20Mg2Si Alloy

Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
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Academic Editor: Daolun Chen
Received: 9 February 2016 / Revised: 13 March 2016 / Accepted: 21 March 2016 / Published: 29 March 2016
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Abstract

It is found that Li2Sb compound can act as the nucleus of primary Mg2Si during solidification, by which the particle size of primary Mg2Si decreased from ~300 to ~15–25 μm. Owing to the synergistic effect of the Li2Sb nucleus and adsorption-poisoning of Li atoms, the effect of complex modification of Li-Sb on primary Mg2Si was better than that of single modification of Li or Sb. When Li-Sb content increased from 0 to 0.2 and further to 0.5 wt.%, coarse dendrite changed to defective truncated octahedron and finally to perfect truncated octahedral shape. With the addition of Li and Sb, ultimate compression strength (UCS) of Al-20Mg2Si alloys increased from ~283 to ~341 MPa and the yield strength (YS) at 0.2% offset increased from ~112 to ~179 MPa while almost no change was seen in the uniform elongation. Our study offers a simple method to control the morphology and size of primary Mg2Si, which will inspire developing new Al-Mg-Si alloys with improved mechanical properties. View Full-Text
Keywords: Al-Mg-Si alloy; mechanical properties; heterogeneous nucleation; primary Mg2Si Al-Mg-Si alloy; mechanical properties; heterogeneous nucleation; primary Mg2Si
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MDPI and ACS Style

Yu, H.-C.; Wang, H.-Y.; Chen, L.; Zha, M.; Wang, C.; Li, C.; Jiang, Q.-C. Influence of Li2Sb Additions on Microstructure and Mechanical Properties of Al-20Mg2Si Alloy. Materials 2016, 9, 243.

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