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Open AccessArticle

Cooperative Effect of Li Content and Equal-Channel Angular Pressing on Microstructure and Mechanical Properties of Al-Mg-Li Alloy

1
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
2
School of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu 215500, China
3
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
4
Suqian Institute, Hohai University, Suqian 223800, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 840; https://doi.org/10.3390/met9080840
Received: 25 June 2019 / Revised: 16 July 2019 / Accepted: 28 July 2019 / Published: 29 July 2019
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Abstract

This paper investigated the cooperative effects of Li addition and warm Equal Channel Angular Pressing (ECAP) on improving the mechanical properties of an Al-Mg-Li alloy for further weight reduction. The results showed that more Li addition could obviously refine the grains of the as-cast alloy and reduce its density value to only 2.37 g/cm3 when Li content reached 2.5% (about 12.6% lighter than commercial Al alloys). It also had a pronounced influence on the precipitations in the Al-5.5Mg-xLi-0.1Zr alloy, i.e., the number density and size of Al2MgLi and δ’-Al3Li phases. The yield strength of the as-cast alloy was increased with increasing Li, but the elongation deteriorated due to primary network intergranular Al2MgLi and more δ’ particles in the high Li-containing alloy. The warm multi-pass ECAP process was found to simultaneously improve the strength and ductility of the Al-Mg-Li alloys, and greatly alleviate the detrimental effect of Li addition on the elongation, thereby making the ultrafine-grained (UFG) alloys, a good combination of lightweight and high performance, very attractive for aerospace applications for much higher specific strength than both Al matrix composites and Mg alloys. View Full-Text
Keywords: equal-channel angular pressing (ECAP); Li content; Al-Mg-Li alloy; microstructures; mechanical properties equal-channel angular pressing (ECAP); Li content; Al-Mg-Li alloy; microstructures; mechanical properties
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Yuan, T.; Jiang, J.; Wu, Y.; Yuan, Z.; Ma, A.; Yuan, Y. Cooperative Effect of Li Content and Equal-Channel Angular Pressing on Microstructure and Mechanical Properties of Al-Mg-Li Alloy. Metals 2019, 9, 840.

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