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| Effect of Phase Composition of Matrix Alloys on Mg-Li Based Composites Reinforced With Boride |
| DUAN Huifen, LIU Zhijian, YU Haoran, HUANG Haifeng |
| (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) |
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Abstract In this paper, we have prepared Mg-Li based composites reinforced with boride by in situ synthesis. For
mechanic properties of Mg-14Li-1Al-1Y based composites cannot meet the requirement of industrial applications, the
research has prepared composites reinforced with boride based on Mg-9Li-1Al-1Y (its composition is (Mg-9Li-1Al-
1Y)-6B4C). The effect of Li content on microstructure and properties of the matrix alloys and composites were studied.
The results show that compared with Mg-14Li-1Al-1Y, the dual phase microstructure of Mg-9Li-1Al-1Y is finer and the
mechanical properties are improved. Compared with Mg-9Li-1Al-1Y, the hardness and the tensile strength of (Mg-9Li-
1Al-1Y)-6B4C are enhanced by 66% and 31.33%, respectively, while the elongation decreases by 15.5%. Compared with
(Mg-14Li-1Al-1Y)-6B4C, the yield strength of (Mg-9Li-1Al-1Y)-6B4C decreass by 15.4%, the hardness increases by
29.3%, and the tensile strength and elongation remains unchanged. The above experimental results show that the mechanical
properties of composites have not been improved with the deduce of Li content. It does not reach the expectation that
composite strength can be improved with strength increase of corresponding alloys. The matrix strengthening is too weak to
reflect in comparison to the second phase strengthening and fine-grain strengthening of Mg-Li based composite reinforcement
mechanism.
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2017, 
