上引连铸Cu-4.5Fe合金杆热塑性变形行为及本构方程修正  

Hot plasticity deformation behavior and constitutive equation modification of upward continuous casted Cu-4.5Fe alloy rods

作　　者：申易春相 孙宝森 吕佩阳 程时 伏洪旺 运新兵[2] SHENYI Chun-xiang;SUN Bao-sen;LÜPei-yang;CHENG Shi;FU Hong-wang;YUN Xin-bing(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China;Engineering Research Center of Continuous Extrusion,Ministry of Education,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028 [2]大连交通大学连续挤压教育部工程研究中心,辽宁大连116028

出　　处：《塑性工程学报》2023年第2期152-159,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52275312);辽宁省教育厅(LJKMZ20220867);大学生创新创业项目(202110150086)。

摘　　要：研究了上引连铸Cu-4.5Fe合金杆的热变形行为,并根据真实应力-真实应变曲线对Cu-4.5Fe合金热变形本构方程进行了推导和修正。结果表明,通过在不同应变下进行应力取值拟合的本构方程的精准性更高。此外,热加工图在不同应变条件下也不同,表明材料的热塑性与真实应变也直接相关。显微组织观察表明,Cu-4.5Fe合金的变形软化机制主要是受动态回复控制,其原因是Fe元素的加入使铜基体堆垛层错能增加,有利于位错的交滑移和攀移,从而促进了动态回复的发生。变形激活能的计算结果也证明了动态回复在塑性变形过程中会优先于动态再结晶发生。The hot deformation behavior of upward continuous casted Cu-4.5Fe alloy rod was investigated,and the hot deformation constitutive equation of Cu-4H5Fe alloy was derived and modified based on the true stress-true strain curves.The results show that the accuracy of the constitutive equation fitted by the values of stress with different strains is high.In addition,the hot processing maps are different with different strains,which indicates that the hot plasticity also directly relates to true strains.Microstructure observation shows that the deformation softening mechanism of Cu-4.5Fe alloy is mainly governed by dynamic recovery(DRV).The reason is that the addition of Fe element increases the stacking fault energy of Cu matrix,which is beneficial to the cross-slip and climbing of dislocations,thus the occurrence of DRV is facilitated.The calculation results of deformation activation energy also prove that the DRV occurs preferentially compared with the dynamic recrystallization during plastic deformation.

关 键 词：铜合金 热塑性变形 本构方程 显微组织演变 

分 类 号：TG379[金属学及工艺—金属压力加工]