压铸ADC12铝合金手机中框热裂分析及解决措施  

Analysis and Solution of Hot Tear in Die-Casting ADC12 Aluminum Alloy Mobile Phone Frame

作　　者：闫俊 程汉明 石帅 范卫忠 高伟全 YAN Jun;CHENG Han-ming;SHI Shuai;FAN Wei-zhong;GAO Wei-quan(Guangdong Hongbang Metal Aluminum Co.,Ltd.,Guangzhou 510115,Guangdong,China;Huajin New Material Research Institute(Guangzhou)Co.,Ltd.,Guangzhou 510115,Guangdong,China)

机构地区：[1]广东鸿邦金属铝业有限公司,广东广州510115 [2]华劲新材料研究院(广州)有限公司,广东广州510115

出　　处：《铸造》2021年第9期1088-1092,共5页Foundry

摘　　要：采用直读光谱仪、扫描电镜及金相检验等方法对压铸ADC12铝合金手机中框热裂的原因进行了分析。结果表明,热裂发生于晶界处,其两侧分布有大量气孔及碳氧夹杂物,且存在较多的块状β(Al_(9)Fe_(2)Si_(2))脆性相,阻碍了合金的补缩通道,增加了合金的脆性,恶化了材料的力学性能。同时由于在冷却过程中受到热力学因素影响导致内部组织分布不均,产生较大热应力,使手机中框在压铸过程中产生热裂纹。In this study,the causes of hot tear defect in the middle frame of the die-cast ADC12 aluminum alloy mobile phone were analyzed by means of direct reading spectrometer,scanning electron microscope and metallographic examination.The results show that the hot tear occurs at the grain boundaries,and there are many blow holes and inclusions containing carbon and oxygen on both sides of the hot tear,as well as massive brittleβ(Al_(9)Fe_(2)Si_(2))phase,which blocks the feeding channel of the alloy melt,increases the brittleness of the alloy,and degrades the mechanical properties of the material.At the same time,due to the influence of thermodynamic factors in the cooling process,the microstructure of the alloy is uneven,resulting in a large thermal stress,so that the hot tear defect is generated in the mobile phone frame during the process of die casting.

关 键 词：手机中框 热裂纹 气孔 夹杂物 

分 类 号：TG249.2[金属学及工艺—铸造]