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Metals 2017, 7(1), 13; doi:10.3390/met7010013

Effect of a Minor Sr Modifier on the Microstructures and Mechanical Properties of 7075 T6 Al Alloys

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, China 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
4
Department of Civil and Structural Engineering, School of Engineering, Aalto University, Helsinki 02015, Finland
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 19 October 2016 / Revised: 15 December 2016 / Accepted: 26 December 2016 / Published: 6 January 2017
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Abstract

The influence of a minor strontium (Sr) modifier on the microstructures and mechanical properties of 7075 Al alloys was investigated in this paper. The grain size of cast 7075 Al alloys was refined from 157 μm to 115 μm, 108 μm, and 105 μm after adding 0.05 wt. %, 0.1 wt. %, and 0.2 wt. % Sr, respectively. The extruded 7075 Al alloys was refined with different degrees of Sr modifier. The mechanical properties were optimum when adding 0.1 wt. % Sr. The ultimate tensile strength (σb) increased from 573 to 598 MPa and the elongation-to-failure (δf) was raised from 19.5% to 24.9%. The microhardness increased from 182 to 195 Hv. The tensile fracture surface via scanning electron microscopy (SEM) revealed a transition from brittle fracture to ductile fracture as Sr increased from 0 wt. % to 0.2 wt. %. The result in this paper proved that the modifier can improve the properties of 7075 Al alloy. View Full-Text
Keywords: 7075 Aluminum alloy; Sr modifier; mechanical properties 7075 Aluminum alloy; Sr modifier; mechanical properties
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Ma, S.; Sun, Y.; Wang, H.; Lü, X.; Qian, M.; Ma, Y.; Zhang, C.; Liu, B. Effect of a Minor Sr Modifier on the Microstructures and Mechanical Properties of 7075 T6 Al Alloys. Metals 2017, 7, 13.

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