7050铝合金的热变形行为及热加工图研究  

Study on Hot Deformation Behavior and Hot Processing Map of 7050 Aluminum Alloy

作　　者：郝爱国[1] 吉卫[1] 郝花蕾 HAO Aiguo;JI Wei;HAO Hualei(Institute of Mechanical Manufacturing Technology,Chinese Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院机械制造工艺研究所

出　　处：《热加工工艺》2018年第17期141-144,共4页Hot Working Technology

摘　　要：通过热力模拟系统地研究了7050铝合金的热塑性变形行为,拟合出了该合金在宽温度区间及应变速率下的高温本构关系模型,建立了热加工图,探讨了热变形机理。结果表明：在变形温度250～465℃、应变速率0.001～10 s-1下,7050铝合金的流动应力随变形温度的降低及应变速率的升高而升高;应变量对7050铝合金的热加工图影响不明显,能量耗散效率随应变速率的降低和变形温度的升高而增大。The thermoplastic deformation behavior of 7050 aluminum alloy was systematically studied by thermal mechanical simulation. The high temperature constitutive relation model of the alloy under wide temperature range and strain rate was fitted, the hot processing map was established, and the thermal deformation mechanism was discussed. The results show that the flow stress of 7050 aluminum alloy increases with the decrease of deformation temperature and the increase of strain rate at deformation temperature of 250-465 ℃ and strain rate of 0.001-10 s^（-1）. The influence of the strain on the thermal processing map of 7050 aluminum alloy is not obvious, and the energy dissipation efficiency increases with the decrease of strain rate and the increase of deformation temperature.

关 键 词：热力模拟 7050铝合金 本构关系 热加工图 

分 类 号：TG301[金属学及工艺—金属压力加工] TG146.21[一般工业技术—材料科学与工程]