摘要
利用Gleeble-1500热模拟试验机对新型超高强Al-Zn-Mg-Cu-Zr-Sc合金进行高温热压缩实验,研究该合金在变形温度370～460℃、应变速率0.001～10s^(-1)条件下的流变应力以及变形过程中的显微组织。结果表明:流变应力在变形初期随着应变的增加迅速增大,出现峰值应力后逐渐下降并达到稳态,流变应力随着应变速率的增大而增大,随着变形温度的升高而下降;流变应力可以采用双曲正弦形式的关系来描述,通过线性拟合计算出该材料的形变激活能等参数,获得流变应力的本构方程。随着变形温度升高和应变速率降低,原始晶粒变形程度显著增加,再结晶分数明显上升。
The hot compression test of the new ultra strength Al-Zn-Mg-Cu-Zr-Sc alloy at high temperature was carried out by using the Gleeble-1500 thermal simulator.The flow stress and microstructure evolution during the deformation processof the new alloywere investigated at the deformation temperature 370-460 C,the strain rate 0.001-10s-1.The results show that the flow stress in the early deformation stage increases with the increase of the strain rapidly,and then the peak stress decreases gradually and reaches a steady state.The flow stress increases with increasing strain rate,and decreases with the increase of deformation temperature.The low stress can be described with hyperbolic sine relationship,and material parameters such as activation energy can be calculated by linear fitting,thus the constitutive equation of flow stress can be presented finally.With the increase of the deformation temperature and the decrease of the strain rate,the deformation degree of the original grain in creases significantly,and the recrystallization fraction increases obviously.
作者
王宇
熊柏青
李志辉
温凯
黄树晖
李锡武
张永安
WANG Yu;XIONG Bai-qing;LI Zhi-hui;WEN Kai;HUANG Shu-hui;LI Xi-wu;ZHANG Yong-an(State Key Laboratory of Nonferrous Metals and Processes,General Research Institute for Nonferrous Metals,Beijing 100088,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第2期99-106,共8页
Journal of Materials Engineering
基金
国家重点研发计划(2016YFB0300803)
国家重点基础研究发展计划(973计划)(2012CB723900)
作者简介
通讯作者:熊柏青(1963—),男,博士,教授,主要从事航空航天飞行器制造用髙强髙韧铝合金材料研究,联系地址:北京市新街口外大街2号(100088),E-mail:xiongbq@grinm.com;李志辉(1980-),男,博士,教授,主要从事新型超髙强髙韧耐蚀铝合金设计及其先进制备技术研究,联系地址:北京市新街口外大街2号(100088),E-mail:lzh@grinm.com
