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Effects of Complex Modification by Sr-Sb on the Microstructures and Mechanical Properties of Al-18 wt % Mg2Si-4.5Cu Alloys.
- Source :
- Materials (1996-1944); 2016, Vol. 9 Issue 3, p157, 8p, 1 Color Photograph, 3 Black and White Photographs, 1 Chart, 2 Graphs
- Publication Year :
- 2016
-
Abstract
- This research was carried out to investigate the influence of Sr-Sb on the microstructures and mechanical properties of Al-18 wt % Mg2Si-4.5Cu alloys. After the addition of 0.2 wt % Sr-Sb, the morphologies of primary Mg<subscript>2</subscript>Si transformed from equiaxed dendrite to cube in as-cast alloys and the average size of primary Mg<subscript>2</subscript>Si decreased from ~50 to ~20 µm. The shape of eutectic Mg<subscript>2</subscript>Si changed from Chinese script to short rod. After extrusion and T6 heat treatment, the ultimate tensile strength of modified alloy at room temperature (RT) and 100 °C increased respectively from 229 to 288 MPa, and from 231 to 272 MPa. The elongation-to-failure only slightly improved from 2.9% to 3.8% and from 3.3% to 3.7% at RT and 100 °C, respectively. The tensile fracture surface revealed a transition from brittle fracture to ductile fracture after modifying by 0.2 wt % Sr-Sb. [ABSTRACT FROM AUTHOR]
- Subjects :
- MICROALLOYING
METALLIC composites
MICROSTRUCTURE
ALLOYS
TENSILE strength
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 9
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 114038096
- Full Text :
- https://doi.org/10.3390/ma9030157