Zener-Hollomon参数对AZ61镁合金热变形行为的影响  

Impact of Zener-Hollomon parameter on hot deformation behavior of AZ61 magnesium alloy

作　　者：李玮[1] 戴浩浩 阎泽文 刘孝轲 徐岩[1] LI Wei;DAI Haohao;YAN Zewen;LIU Xiaoke;XU Yan(Key Laboratory of Advanced Forging&Stamping Technology and Science(Yanshan University),Ministry of Education of China,Qinhuangdao,Hebei 066004,China)

机构地区：[1]先进锻压成形技术与科学教育部重点实验室(燕山大学),河北秦皇岛066004

出　　处：《燕山大学学报》2021年第4期328-334,342,共8页Journal of Yanshan University

基　　金：国家自然科学基金资助项目(51605421);河北省高等学校科学技术研究项目(QN2019129)。

摘　　要：利用Gleeble-3500热模拟试验机,对均匀化退火处理后的铸态AZ61镁合金进行了等温热压缩变形实验,研究了合金在变形温度为220℃~380℃、应变速率为0.001 s^(-1)~10 s^(-1)条件下的热变形行为和组织演变特征,并基于双曲正弦模型建立了合金的本构模型。研究了Zener-Hollomon参数对热压缩变形组织演变的影响规律,揭示了高Z值、中等Z值和低Z值对应参数条件下的变形合金呈现不同的组织形貌特征,并阐明了随Z参数的逐渐减小,变形组织逐渐由失稳组织、不完全动态再结晶组织转变为粗化的完全动态再结晶组织,确定了合理的热成形工艺参数区间对应的lnZ数值范围为22.17~29.25。In the present work,hot compression tests of an as-cast AZ61 magnesium alloy after homogenizing annealing treatment was conducted at temperatures of 220℃~380℃and strain rates of 0.001 s^(-1)~10 s^(-1) by using a Gleeble-3500 thermal simulator.The hot deformation behavior and deformed microstructure characteristics were investigated.Based on the hyperbolic sine model,the constitutive modelling was established.The impact of the Zener-Hollomon parameters on the microstructural evolution was studied.The results reveal that the deformed alloys are featured by various microstructure characteristics under deformation conditions falling within high,medium and low Z values.It is also shown that the deformed microstructure gradually changes from instability microstructure,incomplete dynamic recrystallized structure to complete and coarsened dynamic recrystallized structure with the decrease of the Z value.Furthermore,the optimal hot processing parameters are determined with the lnZ value ranging from 22.17 to 29.25.

关 键 词：AZ61镁合金 热变形 本构模型 ZENER-HOLLOMON参数 动态再结晶 

分 类 号：TG316.1[金属学及工艺—金属压力加工]