铸造温度对AlSi9Cu3(Fe)合金显微组织的影响  

Effect of Casting Temperature on Microstructure of AlSi9Cu3(Fe)Alloy

作　　者：乔露露 李丽华 QIAO Lulu;LI Lihua(College of Automotive Engineering,Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030600,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]山西工程科技职业大学汽车工程学院,山西晋中030600 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《热加工工艺》2024年第22期163-166,共4页Hot Working Technology

基　　金：山西省自然科学基金项目(201801D221164)。

摘　　要：AlSi9Cu3(Fe)铝合金是铸造铝合金中使用较为广泛的合金,铸造温度是亚共晶铝硅合金获得优良力学性能的重要加工参数。通过研究不同铸造温度下AlSi9Cu3(Fe)合金中α-Fe和β-Fe的含量,推导含铁化合物相的演化过程。在680~960℃之间,以70℃为间隔,选择5种不同温度制备得到Fe含量约为0.7wt%的AlSi9Cu3(Fe)合金。结果表明,在不同铸造温度下,AlSi9Cu3(Fe)合金的二次枝晶臂间距没有显著变化。当铸造温度高于890℃后,有害相β-Fe的析出受到了一定程度的抑制。同时,块状或汉字状的α-Fe相成为微观结构的主导相。当铸造温度较高时,富Fe相结晶成稳态β-Fe相的平衡条件被打破,更容易形成亚稳态的α-Fe相。AlSi9Cu3(Fe)aluminum alloy is widely used in casting aluminum alloy.Casting temperature is an important process parameter to obtain excellent mechanical properties of hypoeutectic Al-Si alloy.The evolution of Fe-containing intermediate compounds in AlSi9Cu3(Fe)cast aluminum alloy by testing theα-Fe andβ-Fe content at different casting temperatures was studied.AlSi9Cu3(Fe)alloys with Fe content of about 0.7wt%were prepared at different temperatures ranging from 680℃to 960℃and casting temperature interval of 70℃.The results show that the secondary dendrite arm spacing of AlSi9Cu3(Fe)alloy does not change significantly at different casting temperatures.When the casting temperature is higher than 890℃,the precipitation of harmfulβ-Fe phase is inhibited in a certain extent.At the same time,the bulk or Chinese character shapeα-Fe phase becomes the dominant phase of the microstructure.When the casting temperature is high,the equilibrium condition of Fe-rich phase crystallizing into steadyβ-Fe phase is broken,and the metastableα-Fe phase is more easily formed.

关 键 词：AlSi9Cu3(Fe)铸造铝合金 铸造温度 Fe元素 显微组织 硬度 

分 类 号：TG292[金属学及工艺—铸造]