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

Yu, Hong-Chen; Wang, Hui-Yuan; Chen, Lei; Zha, Min; Wang, Cheng; Li, Chao; Jiang, Qi-Chuan

doi:10.3390/ma9040243

Open AccessArticle

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

by

Hong-Chen Yu

,

Hui-Yuan Wang

^*,

Lei Chen

,

Min Zha

^*,

Cheng Wang

,

Chao Li

and

Qi-Chuan Jiang

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

^*

Authors to whom correspondence should be addressed.

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

Submission 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.

Keywords: 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. https://doi.org/10.3390/ma9040243

AMA 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(4):243. https://doi.org/10.3390/ma9040243

Chicago/Turabian Style

Yu, Hong-Chen, Hui-Yuan Wang, Lei Chen, Min Zha, Cheng Wang, Chao Li, and Qi-Chuan Jiang. 2016. "Influence of Li₂Sb Additions on Microstructure and Mechanical Properties of Al-20Mg₂Si Alloy" Materials 9, no. 4: 243. https://doi.org/10.3390/ma9040243

APA Style

Yu, H.-C., Wang, H.-Y., Chen, L., Zha, M., Wang, C., Li, C., & Jiang, Q.-C. (2016). Influence of Li₂Sb Additions on Microstructure and Mechanical Properties of Al-20Mg₂Si Alloy. Materials, 9(4), 243. https://doi.org/10.3390/ma9040243

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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

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