Al-Si合金弹性模量与Si相含量及其形态的相关性研究  

Study of the Relationships between the Elastic Modulus of Al-Si Alloys and the Si Content and Morphology

作　　者：王宏宇 苏宏福 胡静怡 高通[1] 刘相法[1] WANG Hongyu;SU Hongfu;HU Jingyi;GAO Tong;LIU Xiangfa(Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061

出　　处：《铸造技术》2025年第4期362-370,共9页Foundry Technology

基　　金：国家自然科学基金面上项目(52471040);山东省自然科学基金面上项目(ZR2022ME005)。

摘　　要：为研究Al-Si合金弹性模量与合金中Si相含量及其形态的相关性,通过熔体法制备了亚共晶Al-3Si、Al-5Si、Al-7Si、Al-9Si合金、近共晶Al-12.5Si合金及过共晶Al-18Si合金,并对Al-9Si、Al-12.5Si和Al-18Si合金分别进行了P变质和Sr变质处理。通过声速法测量了合金的弹性模量,利用ImageJ软件获得了合金微观组织中Si相的面积分数,并揭示了其与Si相体积分数的相关性,经数据拟合分别得到合金弹性模量与合金中Si含量及微观组织中Si相面积分数的函数关系。结果表明,随着Si含量的增加,合金的弹性模量不断提高。经P变质和Sr变质处理后,Al-9Si、Al-12.5Si和Al-18Si合金的弹性模量均降低,分析认为,Si相形态变化导致合金中Si相体积分数的降低,进而引起合金弹性模量的变化。To study the relationships between the elastic modulus of Al-Si alloys and the content and morphology of the Si phase,hypereutectic Al-3Si,Al-5Si,Al-7Si,Al-9Si,near-eutectic Al-12.5Si and hypoeutectic Al-18Si alloys were prepared via the melting method,and the Al-9Si,Al-12.5Si and Al-18Si alloys were modified with P and Sr,respectively.The elastic modulus of the alloys was detected via the sound velocity method.The area fraction of the Si phase in the microstructures was measured via ImageJ software,and its relationship with the volume fraction of the Si phase was revealed.The functional relationships between the elastic modulus of the Al-Si alloys and the Si content and the area fraction of the Si phase in the microstructures were obtained via data fitting.The results show that with increasing Si content,the elastic modulus of the alloys increases continually.After being modified by P and Sr,the modulus of the selected Al-9Si,Al-12.5Si and Al-18Si alloys decreases.The morphological change in the Si phase leads to a decrease in the volume fraction of the Si phase,which results in a change in the elastic modulus.

关 键 词：AL-SI合金 弹性模量 微观组织 变质处理 

分 类 号：TG292[金属学及工艺—铸造]