摘要
采用累积叠轧工艺制备了1 mm厚的Al-Mn和Al-Mn-Er-Zr合金,研究了累积叠轧道次对Al-Mn和Al-Mn-Er-Zr合金显微组织、拉伸性能、显微硬度和微观结构的影响,分析了累积叠轧和微量元素Er、Zr的作用机理。结果表明:随着累积叠轧道次的增加,Al-Mn和Al-Mn-Er-Zr合金板的界面结合数不断增加,界面结合质量有所提高,且相同累积叠轧道次下Al-Mn-Er-Zr合金板的界面结合质量更好;累积叠轧后Al-Mn和Al-Mn-Er-Zr合金板的强度相较于叠轧前有所提高,断后伸长率有所减小,而随着累积叠轧道次增加,强度和硬度不断增大而塑性变化较小;在相同的叠轧道次下,Al-Mn-Er-Zr合金的强度和硬度都要高于Al-Mn合金; Al-Mn和Al-Mn-Er-Zr合金叠轧后都会在形变区域形成亚晶和位错胞,且随着累积叠轧道次的增加,位错胞会逐渐转变为细小晶粒;相同叠轧道次下Al-Mn-Er-Zr合金中位错和亚晶密度会更高,这与Al-Mn-Er-Zr合金中形成了细小的钉扎位错和晶界的颗粒状Al3Er相有关。
Al-Mn and Al-Mn-Er-Zr alloys with thickness of 1 mm were prepared by accumulative overlapping rolling process.Then,the influences of accumulative overlapping rolling passes on microstructure,tensile properties,microhardness and microstructure of Al-Mn and Al-Mn-Er-Zr alloys were studied,and the mechanism of accumulative overlapping rolling and Er and Zr trace elements was analyzed.The results show that the interfacial bonding number and quality of Al-Mn and Al-Mn-Er-Zr alloy sheets increase with the increasing of accumulative overlapping rolling passes,and the interfacial bonding quality of Al-Mn-Er-Zr alloy sheet is better under the same accumulative overlapping rolling passes.The strength of Al-Mn and Al-Mn-Er-Zr alloy sheets after accumulative overlapping rolling is higher than that of before,however,the elongation after break decreases.With the increasing of rolling passes,the strength and hardness increase,and the plasticity changes slightly.Under the same rolling passes,the strength and hardness of Al-Mn-Er-Zr alloy are higher than that of Al-Mn alloy.Furthermore,Al-Mn and Al-Mn-Er-Zr alloys form subgrains and dislocation cells in the deformation region after rolling,and the dislocation cells gradually change into fine grains with the increasing of accumulative overlapping rolling passes.Therefore,the dislocation and subgrain density are higher in Al-Mn-Er-Zr alloy under the same accumulative overlapping rolling passes,which is related to the formation of fine pinned dislocations and grain boundary Al3 Er phase in Al-Mn-Er-Zr alloy.
作者
董素芹
Dong Suqin(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Vocational and Technical College,Inner Mongolia Agricultural University,Baotou 014109,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2019年第5期154-161,共8页
Forging & Stamping Technology
基金
内蒙古自治区教育科学研究"十三五"规划课题(NZJGH2018153)
关键词
Al-Mn合金板
轧制变形
累积叠轧道次
显微组织
力学性能
Al-Mn alloy sheet
rolling deformation
accumulative overlapping rolling pass
microstructure
mechanical property
