用喷射成形工艺制备了Al-Zn-Mg-Cu系高强铝合金材料， 研究了热挤压工艺与热处理工艺对材料微观组织与力学性能的影响。 在峰时效的情况下材料表现出了高的力学性能指标， 抗拉强度达到754 MPa， 屈服强度达到722 MPa， 断裂延伸率达到8%， 与采用传统铸造变形工艺制备的同类合金相比(σb≥610 MPa， σ0.2≥580 MPa， δ≥4%), 性能有了明显的提高。 合金性能的提高与其基体中呈弥散分布的Mg7Zn3相有很大的关系， 合金的主要强化机制是沉淀强化。
High strength Al-Zn-Mg-Cu alloys were produced by spray forming process. The microstructure and mechanical properties of the extruded products in the T6 and T71 conditions were evaluated. Under peak-aged conditions the products exhibit high levels of performance, with tensile strength up to 754 MPa, yield strength to 722 MPa, elongation of 8%, having great improvement compared to the same alloy produced by conventional casting process. The increase in strength is associated with the high volume fraction of Mg7Zn3 precipitates. The main hardening mechanism of this alloy is precipitation hardening.
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