摘要
使用Gleeble-3500热模拟试验机对AZ80+0.4%Ce镁合金进行高温扭转试验,随后进行时效处理。扭转变形时变形量和应变速率与扭转试样半径呈正比关系,以此研究应变速率及应变量对后期时效效果的影响规律。结果表明:合金经扭转变形后晶粒得以细化,试样横截面形成梯度组织,边缘处的平均晶粒尺寸小于心部;AZ80+0.4%Ce镁合金时效初期,析出相较少,边缘与心部的差别不大;随时效时间的增加,边缘的第二相面积分数明显高于心部;峰值时效时,边缘第二相面积分数仍高于心部;在时效过程中边缘处的硬度值始终高于心部,说明高应变量及应变速率对细晶和时效强化起到促进作用。
Hot torsion deformation of AZ80+0.4%Ce magnesium alloy was tested by Gleeble-3500 thermal simulator,and then aging treatment was carried on.The strain and strain rate is directly proportional to the radius of specimen during torsion,which was proposed to study the influence of strain rate and strain effects on aging.The results show that the grains are refined after torsion,and gradient microstructure is observed at the cross section of the sample.The average grain size of the edge is smaller than that of the heart.There is less second phase and few difference between the edge and the heart of AZ80+0.4%Ce Mg alloy at the initial stage of aging;the area fraction of the second phase on the edge is obviously higher than that of the heart;and the second phase of the edge is still slightly higher than that of the heart until the post stage of aging.The hardness of the edge is always higher than that of the heart during aging and torsion,which means the effect of grain-refinement and aging strengthening is promoted by high strain and strain rate.
作者
马城
李国俊
杨勇彪
张治民
王强
遇鹤儒
MA Cheng;LI Guojun;YANG Yongbiao;ZHANG Zhimin;WANG Qiang;YU Heru(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Jinxi Industries Group Co.,Ltd,Taiyuan 030027,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2019年第1期56-59,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金(51775520)
山西省应用基础研究计划资助(201601D021094)
