Manufacturing Science and Technology(CEASE PUBLICATION) Vol. 3(4), pp. 160 - 169
DOI: 10.13189/mst.2015.030414
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An Investigation into High Temperature Tensile Behavior of Hot-extruded Al–15wt%Mg2Si Composite with Cu-P Addition


F. Fatemi-Jahromi *, M. Emamy
School of Metallurgy and Materials, College of Engineering, University of Tehran, Iran

ABSTRACT

The effects of Cu-15%P master alloy addition and hot-extrusion on microstructure and high temperature properties of Al–15wt% Mg2Si in-situ metal matrix composite have been investigated. For this purpose different concentrations of Phosphorus (0-1 wt%) were added to the remelted composite. P addition changes the morphology of primary Mg2Si from polyhedral to regular shape and decreases the size of primary Mg2Si particles. Maximum reduction in size of Mg2Si particles occurs in 0.05 wt% P content from 26.6 μm to 17.1 μm which is also the most uniform distribution of these particles in the matrix. In order to investigate hot deformation behavior of the hot-extruded composite, a set of isothermal tension tests were conducted in the temperature range of 100–500℃ with intervals of 100℃ under the initial strain rate of 0.001 s-1. The results indicated that elongation percentage improves by increasing temperature which may be probably because of the morphology change in the eutectic structure leading to easier dislocation movement in the matrix. Fractographic analysis was carried out by using scanning electron microscopy (SEM). Providing the fact that larger number of dimples with more even distribution of them can be observed on the fracture surface of the failed specimens by increasing temperature, ductile mode of fracture is more preferable as the testing temperature rises. These observations coincide with elongation percentage variations.

KEYWORDS
Al-15%Mg2Si Composite, Phosphorus Modification, Tensile Properties, Fractography

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] F. Fatemi-Jahromi , M. Emamy , "An Investigation into High Temperature Tensile Behavior of Hot-extruded Al–15wt%Mg2Si Composite with Cu-P Addition," Manufacturing Science and Technology(CEASE PUBLICATION), Vol. 3, No. 4, pp. 160 - 169, 2015. DOI: 10.13189/mst.2015.030414.

(b). APA Format:
F. Fatemi-Jahromi , M. Emamy (2015). An Investigation into High Temperature Tensile Behavior of Hot-extruded Al–15wt%Mg2Si Composite with Cu-P Addition. Manufacturing Science and Technology(CEASE PUBLICATION), 3(4), 160 - 169. DOI: 10.13189/mst.2015.030414.