Al9Fe0.7Ni1.3相对喷射沉积Al-Zn-Mg-Cu-Ni合金组织和性能的影响

Effect of Al9Fe0.7Ni1.3 Phase on the Microstructure and Mechanical Properties of Al-Zn-Mg-Cu-Ni Alloys Prepared by Spray Deposition

摘要:

本文利用喷射沉积技术合成含Ni的Al-Zn-Mg-Cu合金,合金中的Ni元素以亚微米球状Al₉Fe_0.7Ni_1.3化合物的形式存在。利用扫描电镜和电子背散射衍射、透射电镜以及拉伸测试研究了Al₉Fe_0.7Ni_1.3颗粒对合金固溶处理后组织和性能的影响。结果发现：Al₉Fe_0.7Ni_1.3颗粒主要在晶界附近分布,说明该颗粒在固溶过程中具有有力的抑制再结晶作用。固溶处理后,合金的拉伸强度为603 MPa,断裂延伸率为11.79%,主要断裂方式为穿晶延性断裂。实验结果表明亚微米球状Al₉Fe_0.7Ni_1.3化合物对合金性能有重要影响,可以产生细晶强化和Orowan强化,是合金发生穿晶延性断裂的主要原因。

Abstract:

In this study, an Al-Zn-Mg-Cu alloy with Ni added as alloying element was synthesized via spray deposition. The element was present in the alloy in the form of spherical submicrometer Al₉Fe_0.7Ni_1.3 compound particles. The effects of the particles on the microstructure and mechanical properties of the alloy after a solution treatment were investigated by scanning electron microscopy (SEM) in conjunction with electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and tensile tests. We found that the Al₉Fe_0.7Ni_1.3 compound particles were mainly present near the grain boundaries, revealing a powerful recrystallization inhibition effect during the solution treatment. After the solid solution treatment, the alloy exhibited an ultimate tensile strength of 603 MPa and an elongation at break of 11.79%, and transgranular ductile fracture was identified as the main fracture mechanism. The results show that the presence of the spherical submicrometer Al₉Fe_0.7Ni_1.3 compound particles played a key role on the mechanical properties of the alloy, leading to grain refinement strengthening and Orowan strengthening, and was the main reason for the occurrence of transgranular ductile fracture.