Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575280 | Materials Science and Engineering: A | 2014 | 9 Pages |
Abstract
In the present paper, hybrid structured B4C particles reinforced Al2024 matrix composites were prepared by the powder metallurgy method. The composites made from 100% mechanical milled composite powders have fracture strength of 670Â MPa. With the addition of un-milled Al2024 powder increased from 10Â vol% to 40Â vol%, the room temperature compression strength decreased from 1115Â MPa to 739Â MPa, without any visible plastic deformation. However, when the fraction of un-milled Al2024 powder increased to 50Â vol%, the compression strength was decreased to 580Â MPa, while retaining a remarkable fracture strain up to 10%. The microstructures of the composites with different composition were examined by a scanning electron microscope and a transmission electron microscope. The contribution from different strengthening mechanisms was discussed. The hybrid structures are proved to account for the dramatic change of the fracture mechanism of the composites.
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Authors
Ruixiao Zheng, Jing Chen, Yitan Zhang, Kei Ameyama, Chaoli Ma,