(1. 中南大学 材料科学与工程学院，长沙 410083；2. 山西阳泉铝业股份有限公司，阳泉 045003)
摘 要: 采用化学成分分析、金相分析、扫描电镜、力学性能测试、能谱分析及PoDFA杂质分析等技术对国产6061铝合金异型散热型材和进口同种优质6061铝型材进行对比分析。结果表明：国产型材的杂质总含量为0.195 mm2/kg，明显高于进口型材的杂质总含量(0.016 mm2/kg)，且其中存在较多的MgAl2O4尖晶石和MgO硬质杂质相，这些物相具有特殊的形态和较高的硬度，在加工过程中易划伤模具表面而降低型材的表面质量；国产6061铝型材中Mg和Si元素的含量均高于进口试样的，但由于形成了较多大块状、硬而脆的Fe2Si2Al9相，导致国产型材的强度虽稍高于进口型材的，但其伸长率却大幅度下降，也影响型材的表面质量。
关键字: 6061散热铝型材；硬质相；表面质量
6061 special-shaped radiator aluminum profile
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Shanxi Yangquan Aluminium Industry Co., Ltd, Yangquan 045003, China）
Abstract:Contrastive analyses of two kinds of 6061 special-shaped radiator aluminum profiles produced at home and abroad were done by composition analyses, OM, SEM, mechanical tests, energy spectrum analyses and PoDFA inclusion analyses. The results show that the inclusion concentration of the domestic profile is 0.195 mm2/kg, which is obviously higher than that of the imported one (0.016 mm2/kg). There are more spinel MgAl2O4 and MgO inclusions with special shapes and high hardness in the domestic profile, which can scratch the surface of molds and worsen the surface quality of profiles. With higher contents of Mg and Si, the strength of the domestic profile is slightly higher than that of the imported one. However, due to the formation of massive, hard and brittle Fe2Si2Al9 phases, its elongation is much lower than that of the imported one, and its surface quality is also affected.
Key words: 6061 radiator aluminum profile; hard phases; surface quality
