基于三维加工图的AZ31与GW83镁合金热加工可成形性对比研究  

Comparative study on hot processing formability of AZ31 and GW83 magnesium alloys based on 3D processing map

作　　者：曾健[1] 董帅 王锋华 王甫霖 靳丽[1] 董杰[1] ZENG Jian;DONG Shuai;WANG Feng-hua;WANG Fu-lin;JIN Li;DONG Jie(National Engineering Research Center of Light Alloy Net Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心,上海200240

出　　处：《塑性工程学报》2025年第1期177-184,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52071211);国防基础科研项目(JCKY2023209C001);国家重点研发计划(2021YFB3501005)。

摘　　要：为了研究传统商业牌号镁合金与稀土镁合金在热加工可成形性上的差异性,以传统商业牌号AZ31镁合金和高强韧GW83稀土镁合金为研究对象,分别在压缩温度300~450℃,应变速率为0.001~1 s^(-1)条件下开展了热压缩实验,得到了两种合金的真应力-真应变关系曲线,对比分析了两种合金的热压缩变形特性。基于真应力-真应变曲线、动态材料模型和Murty失稳判据,分别建立了两种合金的三维加工图,预测了相应的安全区间和失稳区间,对比了两种合金的热加工可成形性。最后,以两种合金为原料,采用3组不同的工艺参数分别开展了针对同一规格薄壁管的反挤压成形实验。结果表明:与AZ31相比,GW83合金的安全区间较窄,失稳区间较宽,可成形性较差。以AZ31为原料反挤压成形的薄壁管外形较好且组织为细小的再结晶晶粒;而GW83合金在反挤压过程中成形困难,各组已成形薄壁管的边缘均发生了碎裂且组织中含有大量孪晶。验证了基于三维加工图实现不同材料可成形性预测方法的可行性。To study the difference between traditional commercial brand magnesium alloy and rare earth magnesium alloy in hot processing formability,the traditional commercial brand AZ31 magnesium alloy and high-strength and toughness GW83 rare earth magnesium alloy were taken as the reserch subjects,the thermal compression tests were carried out at compression temperature of 300-450℃and strain rate of 0.001-1 s^(-1),respectively.The true stress-true strain curves of the two alloys were obtained,and the thermal compression deformation characteristics of the two alloys were compared and analyzed.Based on the true stress-true strain curves,dynamic material model and Murty instability criterion,the 3D processing maps of the two alloys were established,the corresponding safe and unstable intervals were predicted and the hot processing formability of the two alloys were compared.Finally,using two kinds of alloys as raw materials,three different process parameters were used to carry out the reverse extrusion forming tests for the thin-walled tube with the same specification.The results show that compared with AZ31,GW83 alloy has narrower safety interval,wider instability interval and poorer formability.The thin-walled tube formed with AZ31 as raw material has good shape and fine recrystallization grain structure.While GW83 alloy is difficult to form in the process of revese extrusion,the edge of each formed thin-walled tube is broken and there are a lot of twins in the tissue.The feasibility of formability prediction method of different materials based on 3D processing maps are verified.

关 键 词：镁合金 热加工 三维加工图 可成形性 

分 类 号：TG376.2[金属学及工艺—金属压力加工]