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Effects of Complex Modification by Sr–Sb on the Microstructures and Mechanical Properties of Al–18 wt % Mg2Si–4.5Cu Alloys

by Youhong Sun 1,2, Shaoming Ma 1,2, Huiyuan Wang 3, Lei Chen 3, Ke Gao 1,2,*, Yinlong Ma 1,2,3 and Baochang Liu 1,2,*
1
School of Construction Engineering, Jilin University, Changchun 130026, China
2
Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, No. 938 Ximinzhu Street, Changchun 130026, China
3
Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2016, 9(3), 157; https://doi.org/10.3390/ma9030157
Received: 27 January 2016 / Revised: 22 February 2016 / Accepted: 23 February 2016 / Published: 4 March 2016
This research was carried out to investigate the influence of Sr–Sb on the microstructures and mechanical properties of Al–18 wt % Mg2Si–4.5Cu alloys. After the addition of 0.2 wt % Sr–Sb, the morphologies of primary Mg2Si transformed from equiaxed dendrite to cube in as-cast alloys and the average size of primary Mg2Si decreased from ~50 to ~20 μm. The shape of eutectic Mg2Si changed from Chinese script to short rod. After extrusion and T6 heat treatment, the ultimate tensile strength of modified alloy at room temperature (RT) and 100 °C increased respectively from 229 to 288 MPa, and from 231 to 272 MPa. The elongation-to-failure only slightly improved from 2.9% to 3.8% and from 3.3% to 3.7% at RT and 100 °C, respectively. The tensile fracture surface revealed a transition from brittle fracture to ductile fracture after modifying by 0.2 wt % Sr–Sb. View Full-Text
Keywords: aluminum alloy; composite; grain refinement; modification; mechanical properties aluminum alloy; composite; grain refinement; modification; mechanical properties
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Sun, Y.; Ma, S.; Wang, H.; Chen, L.; Gao, K.; Ma, Y.; Liu, B. Effects of Complex Modification by Sr–Sb on the Microstructures and Mechanical Properties of Al–18 wt % Mg2Si–4.5Cu Alloys. Materials 2016, 9, 157.

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