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以AZ91D为基体,研究了添加Be和Y对其压铸组织的影响。结果表明,加入Be,AZ91D合金组织中析出了Mg_(3.1)Al_(0.9)、Mg_2A_(l3)和Mg_(17)Al_(12)相。Be含量增加,AZ91D合金α-Mg相枝晶得到细化,有球化趋势。Y也可显著细化α-Mg基体,并细化β-Mg_(17)Al_(12)相;随Y含量的增加,压铸AZ9D合金组织得到逐步细化,相组成为α-Mg、Mg_(0.97)Zn_(0.03)和Mg_(3.1)Al_(0.9)。
Based on AZ91D, the effects of Be and Y on the die-casting structure were investigated. The results show that Mg_ (3.1) Al_ (0.9), Mg_2A_ (13) and Mg_ (17) Al_ (12) phases are precipitated in the Be and AZ91D alloys. Be content increased, AZ91D alloy α-Mg phase dendrite refined, a tendency of spheroidization. The microstructures of AZ9D alloy during the die-casting process were further refined with the increase of Y content. The phase composition of α-Mg and Mg_ (17) Al_ (12) 0.97) Zn_ (0.03) and Mg_ (3.1) Al_ (0.9).