Effect of Er on Microstructures and Mechanical Properties of As-cast AC7A Al-Mg Alloys
Author of the article:CHENG Yong;YI Danqing;WANG Nanhai;WANG Haisheng
Author's Workplace：School of Materials Science and Engineering,Central South University, Changsha 410083,China;Hunan Rare Earth New Material Co., Ltd., Hengyang 421000,China
Key Words：rare earth Er AC7A alloy primary Al3Er phase mechanical properties
Abstract：
By means of metallographic microscope(OM), X-ray diffraction(XRD), scanning electron microscopy(SEM),energy spectrometer(EDS) and mechanical properties test, the influence of the presence and content of Er on the mechanical properties of AC7A Al-Mg alloy was studied. The results show that in addition to solid solution in α-Al matrix,a large amount of primary Al3Er phase is precipitated. These precipitated phases can be used as non-uniform nucleating particles of α-Al during the crystallization of the alloy, which can reduce nucleating work, refine casting structure and improve the mechanical properties of AC7A alloy to a certain extent.
