Influence of thermomechanical treatment on recrystallization and softening resistance of Cu-6.5Fe-0.3Mg alloy  

形变热处理对Cu-6.5Fe-0.3Mg合金再结晶和抗软化性能的影响

作　　者：Zhen-xia LIU Da-wei YUAN Xin LUO Lan-hao WANG Jin-shui CHEN Hui-ming CHEN Xiang-peng XIAO Bin YANG 刘珍霞;袁大伟;罗鑫;王兰浩;陈金水;陈辉明;肖翔鹏;杨斌(江西理工大学先进铜产业学院,鹰潭335000;江西理工大学材料冶金化学学部,赣州341000)

机构地区：[1]College of Advanced Copper Industry,Jiangxi University of Science and Technology,Yingtan 335000,China [2]Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第9期2900-2917,共18页中国有色金属学报（英文版）

基　　金：financial supports from the Department of Science and Technology and other Provincial and Ministerial Level Projects,China(No.204306800086);Science and Technology Projects of Ganzhou Science and Technology Bureau,China(No.204301000194);the Science and Technology Project of Jiangxi Provincial Department of Education,China(No.204201400853)。

摘　　要：The recrystallization and softening resistance of a Cu-6.5Fe-0.3Mg(mass fraction,%)alloy prepared by Process 1(cold rolling heat treatment)and Process 2(hot/cold rolling heat treatment)were studied using Vickers hardness tests,tensile tests,scanning electron microscopy and transmission electron microscopy.The softening temperature,hardness and tensile strength of the alloy prepared by Process 2 were 110°C,HV 15 and 114 MPa higher,respectively,than those of the alloy prepared by Process 1 after aging at 300°C.The recrystallization activation energy of the alloys prepared by Process 1 and Process 2 were 72.83 and 98.11 kJ/mol,respectively.The pinning effects of the precipitates of the two alloys on grain boundaries and dislocations were basically the same.The softening mechanism was mainly attributed to the loss of dislocation strengthening.The higher Fe fiber density inhibited the average free migration path of dislocations and grain boundary migration in the alloy,which was the main reason for higher softening temperature of the alloy prepared by Process 2.采用维氏硬度试验、拉伸试验、扫描电子显微镜和透射电子显微镜研究由工艺1(冷轧热处理)和工艺2(热/冷轧热处理)制备的Cu-6.5Fe-0.3Mg(质量分数,%)合金的再结晶和抗软化性能。300℃时效后,采用工艺2制备的合金的软化温度、硬度和抗拉强度和比采用工艺1制备的合金分别增加了110℃、HV 15和114 MPa。采用工艺1和工艺2制备的合金的再结晶活化能分别为72.83和98.11 kJ/mol,且两种合金中析出相对晶界和位错的钉扎作用基本相同。软化机制主要归因于位错强化的损失。较高的Fe纤维密度抑制了位错的平均自由行程和晶界迁移,这是工艺2制备合金的软化温度更高的主要原因。

关 键 词：Cu−6.5Fe−0.3Mg alloy hot rolling recrystallization activation energy softening mechanism dislocation strengthening 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]