喷射成形Al-Zn-Mg-Cu合金挤压态的组织和力学性能

Microstructure and mechanical properties of extrusion state Al-Zn-Mg-Cu alloy after spray forming

研究了利用喷射成形辅以挤压制备Al-5.72Zn-2.36Mg-1.66Cu合金后优化的组织结构特征和力学性能。结果表明,合金基体组织均匀细化,晶粒形貌趋于圆整,平均晶粒大小达到10μm左右。当合金的冷却条件通过快速凝固技术改变时,会产生不同程度的固溶强化效果和第二相弥散强化效果,从而改善了合金的整体性能。合金的屈服强度和抗拉强度分别平均提高了20%左右,且伸长率也略有提高。

Optimized microstructure characteristics and the mechanical properties of the Al-5.72Zn-2.36Mg-1.66Cu aluminium alloy prepared by spray forming and continuous extrusion were studied.The results show that the microstructure of the alloy matrix is uniformly refined and the morphology of the grains tends to be rounded.And the average grain size of the alloy is about 10μm.The different effects of the solid solution strengthening and second-phase dispersion strengthening will be generated when the cooling condition of the alloy is changed by the rapid solidification.Thus,the overall properties of the alloy are also improved by spraying.The yield strength and tensile strength of the alloy are increased by about 20%on average,and the elongation is increased slightly.