211Z.X耐热高强韧铝合金热变形行为及加工图研究  

Research on Hot Compressive Deformation and Processing Map of 211Z.X Heat-resisting High Strength Aluminium Alloy

作　　者：徐祥[1,2,3] 杨明[1,2,3,4] 梁益龙[1,2,3] 张世伟[1,2,3] 龚乾江 

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州省材料结构与强度重点实验室,贵阳550025 [3]高性能金属结构材料与制造技术国家地方联合工程实验室,贵阳550025 [4]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料导报》2016年第18期143-148,154,共7页Materials Reports

基　　金：国家自然科学基金(51461006);贵州省科技厅重大专项(黔科合重大专项字(2010)6007号);贵州大学研究生创新基金(研理工2016023)

摘　　要：在Gleeble-3500热模拟试验机上对211Z.X耐热高强韧铝合金进行了等温热压缩实验,实验的应变温度为350~500℃、应变速率为0.01~10s^(-1)。研究了不同变形条件下的流变特征,并分析该合金高温变形时流变应力的规律,构建了材料流变应力本构模型;同时基于动态材料模型建立了加工图,确立了该合金在实验条件的最佳工艺参数。结果显示:功率耗散图与失稳图随应变量的增加而变化,功率耗散峰区由3个逐渐减为1个,失稳区域随应变而移动并逐渐增大;在加工图中,随着应变的增大,安全加工区域逐渐减小。综合加工图与微观组织的分析结果,211Z.X铝合金最佳的加工工艺区间为:变形温度485~500℃、应变速率0.03~10s^(-1)。The hot deformation behaviors of 211Z. X aluminum alloy had been studied on Gleeble-3500 thermal simulation test machine in the temperature range of 350-500℃ and the strain rates range of 0. 01-10 s^-1. The flow behavior and the law of the high temperature deformation were investigated. The constitutive relation model of flow stress was established based on the experiment data. And the processing map was established based on the dynamic materials modeling （DMM）. And the optimal processing parameters of 211Z. X aluminum alloy were attained from the processing map. The results showed that the power dissipation map and the instability map changed with the increase of strain rate. The peak domains of power dissipation map decreased and the instability zones of flow behavior moved and increased with the increase of strain rate, meanwhile, the processing safety area of processing map reduced. According to the experimental results including processing map and microstructure, the optimal deformation interval range can be attained, which are T=485-500 ℃, e =0. 03-10 s^-1.

关 键 词：211Z.X耐热高强韧铝合金 热压缩变形 加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]