摘要
通过中频感应熔铸方式制备了不同比例Sn元素的轮毂用Al-22Si-Cu合金,通过实验测试的手段分析了Sn含量对铝合金组织演变的影响。研究结果表明:在铝合金中形成了许多无序形态的树枝状组织。没有加入Sn元素下,铝合金内形成了间距为10.12μm的SDAS;加入Sn元素下,铝合金发生了二次枝晶间距降低。没有加入Sn元素时,在铝合金基体中产生了许多大尺寸的片形共晶硅。对加入1.2%的Sn下铝合金形成了更细小的共晶硅,依然呈片层形态,但片层尺寸明显减小,形成了许多椭圆形态的共晶硅。Al-22Si-Cu-1.2Sn铝合金内除存在α(Al)与Si之外,还生成Al2SiSn初生相,初生相和Al2SiSn相形成了相同的晶胞参数。
Al-22Si-Cu alloy with different proportions of Sn was prepared by medium frequency induction casting.The influence of Sn content on the microstructure evolution of alloy was analyzed by experimental tests.The results show that there are many dendritic structures in the alloy.SDAS with a spacing of 10.12μm was formed in alloy without Sn addition.When the Sn element was added,the secondary dendrite spacing of the alloy decreased.When Sn was not added,many large size eutectic silicon flakes were produced in the alloy matrix.With the addition of 1.2%Sn,the alloy formed finer eutectic silicon,which was still in lamellar form,but with significantly reduced lamellar size,forming many elliptic forms of eutectic silicon.In addition toα(Al)and Si,the primary phase of Al2SiSn is generated in Al-22Si-Cu-1.2Sn alloy,and the primary phase and Al2SiSn phase have the same unit cell parameters.
作者
董晨
徐艳
董庆
DONG Chen;XU Yan;DONG Qing(Department of Mechanical Engineering,Shangrao Vocational Technical College,Shangrao 334109,China;Baotou Rare Earth Research Institute,Baotou 014030,China)
出处
《真空科学与技术学报》
CAS
CSCD
北大核心
2021年第11期1059-1063,共5页
Chinese Journal of Vacuum Science and Technology
基金
江西省教育厅科学技术研究项目(GJJ191669)。
