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采用受控扩散凝固技术铸造ZA27合金,研究了母合金成分对受控扩散凝固铸造ZA27合金组织的影响。结果表明,受控扩散凝固能够细化ZA27合金的组织,改善组织形貌。随着母合金2(Al-Zn-Cu-Mg合金)中Zn含量的增加,母合金1(纯Zn)对母合金2的激冷与对流搅拌作用减弱,受控扩散凝固技术对ZA27合金组织的影响减弱。当母合金2中Zn含量为0时,晶粒尺寸最小,仅为95.9μm,呈不规则的颗粒状;母合金2中Zn含量为10%时,晶粒尺寸为103.8μm,开始出现等轴晶;母合金2中Zn含量为30%时,晶粒尺寸达到137.3μm,略小于ZA27合金传统铸造的145.6μm,出现树枝晶;当母合金2中Zn含量达到40%时,晶粒尺寸达到145.4μm,受控扩散凝固技术对ZA27合金组织的影响基本消失。
The controlled diffusion solidification technique was used to cast ZA27 alloy, and the effect of master alloy composition on controlled diffusion and solidification casting of ZA27 alloy was studied. The results show that controlled diffusion solidification can refine the microstructure of ZA27 alloy and improve the microstructure. With the increase of Zn content in the mother alloy 2 (Al-Zn-Cu-Mg alloy), the chilling and convection agitation of the mother alloy 2 decreased with the mother alloy 1 (pure Zn). The controlled diffusion solidification The impact of weakened. When the content of Zn in master alloy 2 is 0, the grain size is the smallest, only 95.9μm, with irregular granularity. When Zn content in mother alloy 2 is 10%, the grain size is 103.8μm and equiaxed When the content of Zn in master alloy 2 is 30%, the grain size reaches 137.3μm, which is slightly smaller than 145.6μm in traditional casting of ZA27 alloy, dendrite appears. When the Zn content in mother alloy 2 reaches 40%, the grain size reaches 145.4μm, the controlled diffusion solidification technology ZA27 alloy basically disappeared.