镧对锌铝合金显微组织和力学性能的影响.pdfVIP

学兔兔 Feb．2011 铸 造 VO1．60 NO．2 FO RY ‘ 、· -^● ■， ··_、● ·^●v。 {应用技术 { 、^， ’r-^，- ，’^●v’r●、 ■v 镧对锌铝合金显微组织和力学性能的影响 王建华，王先德，苏旭平，涂 浩 (常州大学材料科学与工程学院，常州市先进金属材料重点实验室，江苏常州213164) 摘要：采用微合金化方法研究了微量稀土元素镧对锌铝合金显微组织和力学性能的影响。研究结果表明，稀土与合金 熔液中的锌和铝反应生成的细小稀土化合物可作为OL—AI相的有效异质形核核心，适量的稀土元素镧能阻碍初生11-zn相 枝晶的生长，细化锌铝合金的显微组织；适量的稀土元素使锌铝合金的抗拉强度和伸长率明显提高，稀土镧元素的最 佳加入量为0．05％，此时锌铝合金具有较好的综合力学性能。 关键词：锌铝合金；微合金化；稀土；显微组织；力学性能 中图分类号：TG146．1 文献标识码：A 文章编号：1001—4977(201 1)02—0171—04 E仟ect Of Lanthanum On Microstructure and Mechanical Properties of Zinc．AIuminUm Alloy WANG Jian．hua，WANG Xian—de，SU Xu-ping，TU Hao (School of Materials Science and Engineering，Changzhou University，Key Laboratory of Advanced Metallic Materials of Changzhou City，Changzhou 213164，Jiangsu，China) Abstract：The microalloying method was employed to study the effect of rare—earth Ianthanum on the micrOstructure and mechanical properties of zinc-aluminum alloy．The results show that La reacts with Zn and AI in liquid alloy．and generates fine rare—earth compounds．Most of these compounds could be the effective heter0gene0us nucleation of 0(-AI phase．The growth of the primary dendritic n．Zn phase could be impeded by adding adequate amount of La，which makes the micrOstructure of zinc—aluminum alloy become finer．The adequate amount of La in zinc—aIuminum alloy could increase obviously the tensile strength and elongation of the alloy．When the content of La iS 0．05％．the zinc—aluminum alloy possesses better comprehensive mechanicaI properties． Key words：zinc—aIuminum alloy；microalloying；rare-earth；microstructure；mechanical properties 锌铝合金的强度可以与铸造铝合金相比、耐磨特