铸造2013，Vol.62Issue(3)：230-234,5.
Sr对AZ81镁合金β-Mg17Al12析出相形态及力学性能的影响
Effect of Sr on Morphology of β-Mg17Al12 Precipitated Phase and Mechanical Properties of AZ81 Magnesium Alloy
摘要
Abstract
The effects of Sr addition on the morphology of β-Mg17Al12 phase and mechanical properties of AZ81 magnesium alloy were investigated by using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and electronic tensile testing machine in this study. The results indicate that the addition of 0.3% Sr to AZ81 magnesium alloy decreases the size of β-Mg17Al12 phase obviously and leads to the formation of a new phase so-called A14Sr. Furthermore, with increasing of Sr content, the morphology of β-Mg17Al12 phase changes from continuously strip-like shape to discontinuously strip-like shape or particle-like shape. The mechanical properties of AZ81 magnesium alloy in ambient temperature reach the highest with addition of 0.6% Sr. As Sr content increasing to 0.9%, the amount of β-Mg17Al12 reduces further, A14Sr phase segregates as discontinuously strip-like shape. After T6 treatment, a large amount of β-Mg17Al12 phases precipitate as lamellar-like shape, needle-like shape and point-like shape on grain boundaries and within grains. Simultaneously, the mechanical properties are dramatically improved. With increasing Sr content, the lamellar space between β-Mg17Al12 phases on grain boundaries and the amount of β-Mg17Al12 phase in grain interior all decrease.关键词
AZ81/锶/β-Mg17Al12相/力学性能Key words
AZ81 magnesium alloy/ strontium/ β-Mg17Al12 phase/ mechanical properties分类
矿业与冶金引用本文复制引用
马先臻,许春香,程伟丽,张文波..Sr对AZ81镁合金β-Mg17Al12析出相形态及力学性能的影响[J].铸造,2013,62(3):230-234,5.基金项目
山西省自然科学基金资助项目(2012011022-1). （2012011022-1）
