期刊
MATERIALS CHARACTERIZATION
卷 180, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111416
关键词
Beryllium; Composites; Modification mechanism; Grain refinement; Mechanical properties
类别
资金
- Innovation Project of Guangxi Graduate Education [YCSW2021047, JGY2021015]
- China Postdoctoral Science Foundation [2021 M693800, 2018 M633298]
- MOE key laboratory of New Processing Technology for Non-ferrous Metals and Materials [2021GXMPSF07]
- Guangxi Natural Science Foundation [2017GXNSFAA198271, 2018GXNSFBA138060]
- Guangxi Postdoctoral Research Fund [250307]
- Center of Ecological Collaborative Innovation for Aluminium Industry in Guangxi [20190225]
- National Natural Science Foundation of China [11962001]
- National Key Research and Development Program of China [2019YFC1511103]
The study investigates the effect of beryllium (Be) addition on the microstructure and mechanical properties of a 15%Mg2Si/Al-8Si composite. It was found that the addition of 1.5%Be led to the best improvement in mechanical properties and modification of the alloy's microstructure.
In the present work, the effect of beryllium (Be) addition (0, 0.3, 0.6, 1.0, 1.5 and 2.0 wt%) on the microstructure and mechanical properties of the 15%Mg2Si/Al-8Si composite has been investigated. With the addition of Be, the morphology of the primary Mg2Si particles changed from dendritic to regular, the eutectic Si phase was refined remarkably, and the size of the Mg2Si phase was decreased evidently. With addition of 1.5%Be, the mean grain size of alpha-Al decreased from similar to 24 mu m to similar to 13 mu m and the finest eutectic Si phase were obtained, in the meantime, the Mg2Si particles were present in fully modified square to spherical. In addition, it was proposed that the according to the microstructure analysis, the BeO phases might be responsible for the modification of Mg2Si phases. With addition of 1.5%Be, the maximum improvement of the mechanical properties was achieved, and the corresponding Be-modified alloys in T6 heat treated condition obtained the best tensile properties compared with other experimental alloys, with the corresponding yield strength(YS), ultimate tensile strength(UTS) and elongation(EL) values being 178.2 MPa, 282.0 MPa and 5.1%, respectively. Meanwhile, the shear properties of 1.5% Be-modified and T6 heat treated is improved compared with the un-modified alloy, with the corresponding shear stress (SS) and deformation rate(DR) being 161.0 MPa and 36.3%. Furthermore, the 1.5% Be-modified and T6 heat treated is improved compared with the un-modified alloy, the wear amount and friction coefficient decrease to 0.55mm(3) and 0.5, suggesting it can be a good candidate for the commercial applications.
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