采用拉伸试验和扫描电镜分析技术手段，研究了不同冷却速度对200℃挤压Zn-15Al锌合金的微观组织和室温力学性能的影响。结果表明：经320℃处理1 h后，变形态细小的α（ Al）相发生了粗化。经水淬后α（ Al）相发生了连续析出，形成了α（ Al）+η（ Zn）细小的粒状组织，使其强度稍有提高，塑性明显降低。而经空冷后α（ Al）相发生了共析分解，形成了细片层状组织，导致其强度提高约1倍，塑性下降约80%。这意味着能够通过热处理工艺来调整变形态Zn-15Al锌合金的力学性能，以满足不同应用领域的要求。
The influences of cooling rates during heat treatment on the microstructure and mechanical properties of the extruded Zn-15Al Zn-alloy at 200 ℃ have been investigated by tensile test and scanning electron microscopy. The results show that the fine α( Al)phase of extruded Zn -15Al Zn -alloy at 200 ℃ occurred coarsening by heated treatment at 320 ℃ for 1 h. The tensile strength of extruded Zn -15Al Zn - alloy increased slightly,while the elongation of extruded Zn-15Al Zn-alloy decreased significantly after water quenching,because theα(Al)phase is transformed into α( Al)+η( Zn)fine granular structure though continuous precipitation. After air cooling,the tensile strengthen were increased by about 1 times and the elongation decreased by about 80%,Owing to the α( Al)phase formed a fine lamellar structure decomposition by eutectoid transformation. It is implied that the different mechanical properties can be obtained in the extrusion Zn-15Al Zn alloy manufactured by heat treatment,and the mechanical properties can be satisfied the requirements of different applications.
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