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通过铸锭冶金工艺,制备了6种不同Gd含量的A1-Zn-Mg-Cu-Zr-Gd合金。采用金相观察、力学性能测试、扫描电镜及透射电镜等分析手段,研究了质量分数分别为0%、0.1%、0.15%、0.2%、0.25%、0.3%的Gd对基体合金的铸态及时效态显微组织和力学性能的影响。结果表明,Gd对于A1-Zn-Mg-Cu-Zr合金的组织、性能的影响显著:Gd含量在小于0.25%范围内时,随含量增加细化效果、强度以及伸长率都得到增加;当Gd含量为0.25%时,铸态组织中基体晶粒最小,达到32μm左右;T6态合金组织的强度、伸长率达到最优,抗拉强度达到624.54MPa,屈服强度达到595.00MPa,伸长率为13.3%,且固溶组织具有良好的抗再结晶作用;而当Gd含量超过0.25%时,合金的的组织与性能产生恶化。
Six kinds of Al-Zn-Mg-Cu-Zr-Gd alloys with different Gd contents were prepared by ingot metallurgy. The metallographic observation, mechanical property test, scanning electron microscopy and transmission electron microscopy were used to study the effects of Gd on the matrix and the as-cast of the matrix alloy with 0%, 0.1%, 0.15%, 0.2%, 0.25% and 0.3% Effect of aging microstructure and mechanical properties. The results show that the effect of Gd on the microstructure and properties of A1-Zn-Mg-Cu-Zr alloy is significant. When the content of Gd is less than 0.25%, the strength and elongation of Gd increase with the increase of content. When the Gd content is 0.25%, the matrix grains in the as-cast microstructure are the smallest, reaching about 32μm. The strength and elongation of T6 alloy are the best, the tensile strength reaches 624.54MPa, the yield strength reaches 595.00MPa, the elongation Is 13.3%, and the solid solution-treated tissue has a good anti-recrystallization effect. When the Gd content exceeds 0.25%, the microstructure and properties of the alloy deteriorate.