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).
作者
蒋滨安
周楠
余炜
李娜
何志鑫
黄礼新
余晖
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)
出处
《材料研究与应用》
CAS
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)。
关键词
镁合金
粉末冶金
微观结构
本构方程
加工图
magnesium alloy
powder technology
microstructure
constitutive analysis
processing map
作者简介
蒋滨安,博士研究生,研究方向为轻金属,E-mail:522736949@qq.com;通信作者:余炜,博士研究生,研究方向为轻金属,E-mail:yuwei52213@163.com;通信作者:余晖,河北工业大学教授,博导,河北工业大学材料科学与工程学院材料成型及控制工程系主任。曾在日本、韩国留学工作8年。从事轻质高强金属材料设计制备和塑性加工技术领域研究,主持国家、省部及军工项目10余项,发表SCI论文120余篇,获授权发明专利15件,H因子24,获省部二等奖和三等奖各1项,担任中国材料学会镁合金分会理事,中国镁合金青年委员会常务委员,中国稀土学会稀土轻合金专业委员会委员,中国菱镁行业协会科学技术委员会委员,担任多个中科院一、二区Top期刊青年编委,国家自然科学基金函评专家以及多个省市科技奖评审专家。E-mail:huiyu@vip.126.com。
