Effect of Nd on Microstructure and Mechanical Properties Of Hypereutectic Al-17.5Si Alloy
In this paper, effect of Nd on microstructure and mechanical properties of hypereutectic aluminum silicon alloy (Al-17.5Si) was investigated. The modification mechanism was analysis by Metallographic Microscope, SEM, XRD and Trace Element Analysis. Metallographic Microscope, SEM results show that pure Nd (0.3 wt％) can significantly refine primary silicon of hypereutectic Al-17.5wt％ alloy. Morphology of primary silicon was transformed from pentalpha to block and refined from 50～80μm to 10～30μm. XRD results show that no new phase forms after modification. Trace Element Analysis was carried out and the results show that Nd can purity base metal. Mechanical properties test results show that the whole properties of modified sample were improved significantly. Tensile strength increases about 35.8％ from 120MPa to 163MPa, Elongation change increases about 175％ from 0.8％ to 2.2％. The improvement of mechanical properties should attribute to refinement of coarse primary Si phase and purification of base metal after modification.
Hypereutectic Al-Si alloys Neodymium Modification Primary silicon Mechanical properties
GAO Bo SHI Wei-xi TUGan-feng HAOYi WUGuan-yin
School of Materials and Metallurgy, Northeastern University, 110004
国际会议
沈阳
英文
75-79
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）