一种新型水平连铸Al-Mn-Si-X合金热压缩变形流变应力  

Flow stress behavior of the new horizontal continuous casting Al-Mn-Si-X aluminum alloy during hot compression deformation at elevated temperature

作　　者：尚小阳[1] 钟华萍[2] 孟显娜[1] 张辉[1] 李落星[3] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]江西理工大学材料与化学工程学院,赣州341000 [3]湖南大学汽车车身先进设计与制造国家重点实验室,长沙410082

出　　处：《塑性工程学报》2010年第5期123-127,共5页Journal of Plasticity Engineering

基　　金：汽车轻量化技术国际合作研究项目(S2010GR0739)

摘　　要：采用圆柱体在Gleeble-1500热模拟机上进行热压缩实验,对一种新型水平连铸Al-Mn-Si-X合金热变形流变应力行为进行研究,变形温度为350℃-500℃,应变速率为0.01s-1-10s^-1。结果表明,流变应力先随应变的增大而增大,达到峰值后则逐渐减小并趋于平稳,表现出流变软化特征;而应力峰值是随着温度的升高而减小,随应变速率的增大而增大。应用包含Zener-Hollomon参数的Arrhenius双曲正弦关系描述合金热压缩变形流变应力,其变形激活能Q=159.2kJ/mol。The flow stress behavior of the horizontal continuous casting Al-Mn-Si-X aluminum alloy during hot compression deformation was studied by thermal simulation test on Gleeble 1500 system,the deformation temperature ranges from 350℃ to 500℃ and the strain rate ranges from 0.01s^-1 to 10s^-1.The results show that the flow stress increases with increasing strain and tends to be constant after a peak value.The stress peak increases with increasing strain rate and decreases with increasing deformation temperature,which can be represented by a Zener-Hollomon parameter in the hyperbolic sine equation with the hot deformation activation energy of 159.2kJ/mol.

关 键 词：水平连铸 Al-Mn-Si-X合金 热压缩变形 流变应力 变形激活能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]