AlCuFe准晶对ZL109合金组织和力学性能的影响

Effect of Al-Cu-Fe Quasicrystals on Microstructure and Mechanical Properties of ZL109 Alloy

通过光学显微镜、扫描电子显微镜和X-射线衍射对AlCuFe准晶中间合金增强的ZL109合金的显微组织和相结构进行分析,并对其力学性能进行测定。实验结果表明:AlCuFe准晶中间合金可以细化ZL109合金的显微组织,使合金中的针状共晶硅颗粒化,初晶硅尖角钝化。在ZL109合金的显微组织中除了共晶硅、初晶硅和α-Al外,还出现了Al62.5Cu25Fe12.5二十面体准晶相。合金的铸态和热处理态力学性能均得到提高,尤其韧性提高更为显著。由此说明,利用AlCuFe准晶中间合金增强ZL109合金是一种强化铝合金的行之有效的新途径。

Microstructure and phase constitutes of Zl109 alloy strengthened by Al- Cu -Ire quasicrystals have been studied by using optical microscopy （OM）, scanning electron microscopy （SEM） and X -ray diffraction （XRD）. Mechanical properties of ZL109 alloy have also been tested. The results show that the A1 - Cu - Ire qausicrystals make grain of the matrix refine, morphology of the eutectic silicon changes from needle - like to particle - like, edges of primary silicon become blunt. The Al - Cu - Ire qausicrystals rein- forced ZL109 alloy consists of primary Si, eutectic Si, α- Al and Al62.5Cu25Fe12.5 icosahedral quasicrystal phase. Mechanical properties, particularly the impact toughness, of the as -cast and heat -treated ZL109 alloy are improved obviously, which provid a new way for the strengthening of aluminum alloys.