Effects of La addition on the microstructure and tensile properties of Al-Si-Cu-Mg casting alloys

The effects of La addition on the microstructure and tensile properties of B-refined and Sr-modified Al-11Si-1.5Cu-0.3Mg casting alloys were investigated. With a trace addition of La (0.05wt%–0.1wt%), the mutual poisoning effect between B and Sr can be neutralized by the formation of LaB 6 rather th...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2015-04, Vol.22 (4), p.405-410
Main Authors: Lu, Tao, Pan, Ye, Wu, Ji-li, Tao, Shi-wen, Chen, Yu
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Casting alloys
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Corrosion and Coatings
Elongation
Eutectics
Glass
Intermetallic compounds
Magnesium
Materials Science
Metallic Materials
Microstructure
Natural Materials
Silicon
Strontium
Surfaces and Interfaces
Tensile properties
Thin Films
Tribology
Ultimate tensile strength
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Summary:The effects of La addition on the microstructure and tensile properties of B-refined and Sr-modified Al-11Si-1.5Cu-0.3Mg casting alloys were investigated. With a trace addition of La (0.05wt%–0.1wt%), the mutual poisoning effect between B and Sr can be neutralized by the formation of LaB 6 rather than SrB 6 . By employing a La/B weight ratio of 2:1, uniform microstructures, which are characterized by well refined α-Al grains and adequately modified eutectic Si particles as well as the incorporation of precipitated strengthening intermetallics, are obtained and lead to appreciable tensile properties with an ultimate tensile strength of 270 MPa and elongation of 5.8%.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-015-1086-y