快速凝固/粉末冶金技术制备挤压态AZ91合金热加工性能研究  

Thermal Processing Performance Study of Extruded AZ91 Alloy Prepared by Rapid Solidification/Powder Metallurgy

作　　者：蒋滨安 周楠 余炜 李娜 何志鑫 黄礼新 余晖[4] 殷福星 JIANG Bingan;ZHOU Nan;YU Wei;LI Na;HE Zhixin;HUANG Lixin;YU Hui;YIN Fuxing(PLA AAAAD,Hefei 230031,China;Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 200039,China;School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300401,China;Binzhou Institute of Technology/Shandong Key Laboratory of Advanced Aluminium Materials and Technology,Binzhou 256600,China)

机构地区：[1]陆军炮兵防空兵学院高过载弹药制导控制与信息感知实验室,安徽合肥230031 [2]广东省科学院新材料研究所,广东广州510650 [3]合肥工业大学材料科学与工程学院,安徽合肥200039 [4]河北工业大学材料科学与工程学院,天津300401 [5]滨州魏桥国科高等技术研究院/山东省先进铝基材料与技术重点实验室,山东滨州256600

出　　处：《材料研究与应用》2023年第4期605-611,I0001,I0002,共9页Materials Research and Application

基　　金：军委科技委基础加强项目(2019-JCJQ-142);河北省自然科学基金面上项目(E2022202158)。

摘　　要：对快速凝固粉末冶金制备的挤压AZ91镁合金,在温度为250—400℃、应变速率范围为0.01—1 s^(-1)下进行了热压缩变形试验。同时,利用热加工图分析评价了合金的热加工特性。结果表明:合金的流变应力,随变形温度的升高或应变速率的减小而减小;同时,基于双曲正弦关系建立了描述流变应力行为的本构方程,RS/PM制备的AZ91挤压合金的热变形机制为晶格扩散控制的位错蠕变;通过微观组织验证了动态再结晶和流变失稳行为,当温度高于350℃、应变速率在0.01—0.1 s^(-1)时,合金的可加工性最佳。In this paper,hot compression deformation tests were conducted on extruded AZ91 magnesium alloy prepared by Rapidly Solidified/Powder metallurgy(RS/PM)at temperatures of 250—400°C and strain rates ranging from 0.01 to 1 s^(-1).The thermal processing characteristics of the alloy were evaluated using thermal processing diagram analysis.The results showed that the rheological stress of the alloy decreased with the increase of deformation temperature or the decrease of strain rate.Meanwhile,the constitutive equations describing the behavior of rheological stresses were established based on hyperbolic sinusoidal relations,and the thermal deformation mechanism of AZ91 extruded alloy prepared by RS/PM was dislocation creep controlled by lattice diffusion.The dynamic recrystallization and rheological instability behaviors were verified by microstructure,and the alloy has the best machinability when the temperature is above 350°C and the strain rate is in the range of 0.01—0.1 s^(-1).

关 键 词：镁合金 粉末冶金 微观结构 本构方程 加工图 

分 类 号：TG146.22[一般工业技术—材料科学与工程]