摘要
采用Gleeble-1500热模拟机进行热压缩变形实验,研究了一种新型Al-7.5Zn-1.6Mg-1.4Cu-0.12Zr合金在变形温度为380～460℃、应变速率为0.001～0.1s-1条件下的流变应力特征,并利用TEM分析了合金在不同变形条件下的组织形貌特征。结果表明,应变速率和变形温度对合金流变应力的大小有显著影响,流变应力随变形温度的升高而降低,随应变速率的提高而增大;合金平均亚晶尺寸随温度补偿应变速率Zener-Hollomon参数的升高而减小。可用Zener-Hollomon参数描述该Al-Zn-Mg-Cu合金热变形时的流变应力行为。
The flow stress feature of a novel Al-7.5Zn-1.6Mg-1.4Cu-0.12Zr alloy during hot deformation was investigated by isothermal compression tests using Gleeble-1500 system under the conditions of temperature at the range from 380 to 460 ℃ and strain rate in the from 0. 001 to 0.1 s^-1. TEM was employed to analyze the microstructures of the alloy. The results showed that the flow stress was controlled by both strain rate and deformation temperature. The flow stress decreases with increasing temperature and increases with a rise in strain rate. The mean subgrain size decreased with increase of Zener-Hollomon parameter. The flow stress of this Al-Zn-Mg-Cu alloy during hot deformation could be represented by a Zener-Hollomon parameter.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2008年第5期552-557,共6页
Chinese Journal of Rare Metals
