Strengthening effect of Y₂O₃ on AZ92 magnesium alloy using stir casting process has been investigated. Nominal amounts of Y₂O₃ (0, 1, 1.5, 2, 2.5 and 3 in wt%) were added into the melt vortex in the form of preformed master powder (Mg–30 wt% Y₂O₃) to improve their wettability with molten AZ92 alloy. The results showed clearly that without Y₂O₃ addition, the microstructure of the investigated alloy is composed of α-Mg which appeared as coarse dendritic structure, divorced eutectic-containing massive β-Mg₁₇Al₁₂ phase and super-saturated α-Mg solid solution. With Y₂O₃ addition, the distribution of Y₂O₃ particles was found within the inter-dendritic regions of the primary α-Mg phase. At 2.5 wt% Y₂O₃, a near uniform distribution of Y₂O₃ particles along the grain boundaries of AZ92 alloy matrix was successfully obtained. However, further addition resulted in agglomeration of Y₂O₃ particles at 3 wt% addition level. The average tensile strength of the investigated AZ92 alloy was increased from 169 MPa to 198 MPa without a significant reduction in its ductility at optimum addition of 2.5 wt% Y₂O₃. The fracture mechanism has been also investigated.

研究了Y ₂ O ₃搅拌铸造对AZ92镁合金的强化作用。以预先制成的母粉（Mg–30 wt％Y ₂ O ₃）的形式将名义量的Y ₂ O ₃（0、1、1.5、2、2.5和3重量％）添加到熔融涡流中以改善其与熔融AZ92合金的润湿性。结果清楚地表明，无Y ₂ ö ₃此外，所研究的合金的显微组织是由α-Mg系，其表现为粗树枝状结构的，离异大量β-含Mg共晶₁₇的Al ₁₂相和超饱和的α-Mg的实在的方法。与Y ₂ø ₃此外，Y的分布₂ ö ₃颗粒被初生α-Mg相的枝晶间的区域内找到。在2.5wt％的Y ₂ O _3下，成功地获得了Y ₂ O ₃颗粒沿着AZ92合金基体的晶界几乎均匀的分布。然而，进一步添加导致Y ₂ O ₃颗粒在3wt％添加水平下附聚。在最佳添加2.5 wt％Y ₂ O _3的情况下，所研究的AZ92合金的平均抗拉强度从169 MPa增加到198 MPa，而延展性没有明显降低。。还研究了断裂机理。