Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7969480 | Materials Characterization | 2018 | 8 Pages |
Abstract
The effects of Cr particles addition on the aging behavior and mechanical properties of SiCp/7075Al composites were systematically investigated. The results show that the precipitation sequence of (5 vol% Cr + 50 vol% SiC)/7075Al composites (C-7075Al) is still: GP zone â ηâ²Â â η (MgZn2), but Cr particles degrade the precipitation kinetics of the C-7075Al composite in comparison to (5 vol% SiCp + 50 vol% SiCp)/7075Al (B-7075Al) because of reduced dislocation density present in the matrix and higher thermal activation energy of the ηⲠphase. Besides, the addition of Cr particles has a significant effect on the mechanical properties of the C-7075Al composite during the aging process. In contrast to the as-cast state, the ultimate tensile strength of the C-7075Al composite obtains an increase of 120 MPa at the peak-aged period, significantly lower than those of 7075Al alloy (207 MPa) and the B-7075Al composite (151 MPa), which is attributable to the severe aggregation of elemental Mg at the interface between Cr particles and the Al matrix.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Tiwen Lu, Weiping Chen, Weiye Xu, Pei Wang, Mengdi Mao, Yixiong Liu, Zhiqiang Fu,