(1. 中南大学 高性能复杂制造国家重点实验室，长沙 410083；
2. 中南大学 材料科学与工程学院，长沙 410083；
3. 中南大学 机电工程学院，长沙 410083；
4. 中南大学 轻合金研究院，长沙 410083)
摘 要: 采用金相显微镜、扫描电镜、拉伸及弯曲性能测试等分析手段，研究复合能场(超声波和电磁场)铸轧工艺对AZ61镁合金板微观组织、力学性能和加工性能的影响。结果表明：与常规铸轧镁合金板带相比，复合能场可有效减小晶粒尺寸，并使析出相均匀弥散分布；施加复合能场之后，铸轧板抗拉强度、屈服强度及伸长率较常规铸轧板分别提高10.58%、12.84%和52.17%，而终轧成品板分别提高10.45%、20.56%和65.25%，且板材轧制后具有裂纹倾向小、抗弯强度及最大挠度大、弯曲抗力小等性质，可有效减少加工过程中材料及工具磨损，获得较好的综合性能。
关键字: AZ61镁合金；复合能场；铸轧；力学性能；加工性能
（1. State Key Laboratory of High Performance and Complex Manufacturing, Central South University,
Changsha 410083, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
3. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
4. Light Alloy Research Institute, Central South University, Changsha 410083, China）
Abstract:The influence of compound energy field (ultrasonic and electromagnetic field) cast-rolling process on the microstructure, mechanical and processing properties of AZ61 magnesium alloy plate was investigated by metallurgical microscopy, scanning electron microscopy, tensile and bending tests. The results show that the compound energy field effectively decreases the grain size and the precipitates distribute homogeneously compared with the conventional cast-rolling magnesium alloy strip. After adding the compound energy field, the tensile strength, the yield strength and elongation of the alloy plate increase by 10.58%, 12.84% and 52.17%, respectively, accompanied with the final rolling plate increasing by 10.45%, 20.56% and 65.25%. Furthermore, after cast-rolling, the alloy plate shows the characteristics of a weaker crack tendency, higher tensile strength and the maximum deflection, a lower bending resistance, etc, which reduces the abrasion between the material and tool during processing, and is also good to omnibus properties.
Key words: AZ61 magnesium alloy; compound energy field; cast-rolling; mechanical property; processing property
