Effect of Nd on Microstructure and Mechanical Properties of Hypereutectic Al-25Si Alloy
The modification mechanism of Nd on Al-25Si alloy was studied. The result showed that pure Nd (0.3％) could significantly refine primary silicon in hypereutectic Al-25Si alloy. And the morphology of primary silicon was transformed from star-shaped to block and the size of primary silicon changed from 150~200 μm to 40~ 80 μm after modification. The morphology of silicon and elements presence was detected by means of SEM-EDS, XRD was carried out to detect the phase constitution before and after modification. It was found that no new phase formed and the lattice of silicon and aluminum increased after modification and most of Nd may exist as solids solute element of silicon and absorb on the surface of silicon. Mechanical property test results showed that after modification with 0.3％ Nd, Tensile strength increased about 33％ from 138 to 184MPa, yield strength increased about 15％ from 126 to 145MPa, and elongation change was not obvious. The improvement of mechanical property should attribute to fine grain strength and purification of base metal after modification.
primary silicon Neodymium modification hypereutectic Al-Si alloy rare earths
Gao Bo(高波) Chen Lei(陈磊) Sun Shuchen(孙树臣) Tu Ganfeng(涂赣峰) Tian Xiaomei(田小梅) Zhao Tiejun(赵铁钧) Wu Wenyuan(吴文远) Bian Xue(边雪)
School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
473-476
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）