重庆理工大学学报（自然科学版）2017，Vol.31Issue(8)：86-92,7.DOI:10.3969/j.issn.1674-8425(z).2017.08.014
稀土元素Er对高锌铝合金组织和性能的影响
Effect of Rare Earth Element Er on Microstructure and Properties of High Zinc Aluminum Alloy
摘要
Abstract
Influences of the addition of different content of rare earth Er on as-cast microstructure and hardness of high zinc aluminum alloys (AlZn32) were studied by optical microscopy (OM), scanning electron microscopy (SEM), energy spectrum analyzer (EDS), X-ray diffraction analyzer (XRD), vickers hardness tester and its refinement mechanism was discussed.The results indicate that the addition of an appropriate amount of rare earth element Er can effectively refine the as-cast microstructure of alloys, and the shape of coarse primary α-Al phase dendrites is transformed into fine and homogeneous equiaxed crystal.The equiaxed grains of the alloy has firstly been decreased and then increased with the increase of Er content.When the content of rare Er reaches 0.2%, the average size of equiaxed crystal is about 30~40μm.The hardness of alloy has firstly been increased and then decreased with the increase of Er content.When the addition of rare Er is 0.2%, the hardness arrives at maximum 127HV.Some Rare Er is distributed in the grain boundary in the form of a bulk Al3Er (Ti,Cr) intermetallic compound, and a small amount of Er is dissolved in the α matrix.关键词
铝锌合金/稀土元素Er/合金硬度/铸态组织Key words
aluminum-zinc alloy/rare earth Er/alloy hardness/as-cast microstructure分类
矿业与冶金引用本文复制引用
张照超,黄福祥,阮海光,钟明君..稀土元素Er对高锌铝合金组织和性能的影响[J].重庆理工大学学报（自然科学版）,2017,31(8):86-92,7.基金项目
重庆市社会民生科技创新专项(cstc2016shmszx80019) （cstc2016shmszx80019）
