Affiliation:
1. Liaoning Petrochemical Vocational and Technology College
Abstract
The effect of different concentrations of Pr on the microstructure and tensile properties of cast Al-18 wt.%Mg2Si in situ metal matrix composite was investigated. The results show that the addition of proper amount of Pr has significant modification effect on primary Mg2Si in the Al-18 wt.% Mg2Si composite. With the increase of Pr content from 0.1 to 0.7%, the morphology of primary Mg2Si is changed from irregular or dendritic to polyhedral shape, and its average particle size is significantly decreased from 65 to 17 μm. When the Pr content exceeds 1.0%, the primary Mg2Si become coarse again. Tensile tests reveal that the Pr addition improves the tensile strength and ductility of the material. Comparing with those of unmodified composite, the ultimate tensile strength and percentage elongation with 0.7% Pr are increased by 36.5% and 161.6%, respectively.
Publisher
Trans Tech Publications, Ltd.
Reference10 articles.
1. Zhang J, Fan Z and Wang Y Q, et al. Microstructural refinement in Al-Mg2Si in-situ composites. J Mater Sci Lett, 1999, 18 (10): 783-784.
2. Qin Q D, Zhao Y G and Zhou W, et al. Effect of phosphorus on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite. Mater Sci Eng A, 2007, 447 (1-2): 186-191.
3. Qin Q D, Zhao Y G and Cong P J. Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite. J Alloy Compd, 2008, 454 (1-2): 142-146.
4. Jiang QC, Wang H Y and Wang Y, et al. Modification of Mg2Si in Mg-Si alloys with yttrium. Mater Sci Eng A, 2005, 392 (1-2): 130-135.
5. Chen J， Li Q A, Li J H, et al. Microstructure and mechanical properties of Mg-6Al magnesium alloy with yttrium and neodymium. China Foundry, 2009, 6 (2): 124-128.
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献