脉冲磁场处理对单质Ni的性能及微观组织的影响-中国材料进展

文章信息/Info

Title:: The Effect of Pulsed Magnetic Treatment on Mechanical Properties and Microstructure of Ni

作者:: 丁雪; 刘剑; 吴明霞; 陈朝浪; 余林涛; 1. 四川大学机械工程学院，四川成都 610065 2. 睿恩光电有限责任公司，四川攀枝花 617000

Author(s):: DING Xue; LIU Jian; WU Mingxia; CHEN Chaolang; YU Lintao; 1. School of Mechanical Engineering，Sichuan University，Chengdu 610065，China 2. Ruien OE Technology Inc，Panzhihua 617000，China

Keywords:: ferromagnetic material; pulsed magnetic treatment; hardness; tensile property; defects distribution

摘要:: 脉冲磁场处理（PMT）是一种便捷高效、绿色环保的后处理方法，可利用脉冲磁场改善金属材料性能。为了研究PMT对纯镍（Ni）力学性能和微观组织的影响，揭示PMT对铁磁性材料的潜在影响机制，采用不同磁场强度PMT对纯Ni样品进行处理，并对处理前后纯Ni样品力学性能、微观组织进行分析。实验结果表明，经强度为0.5~1.5 T的PMT后，样品硬度降低，当脉冲磁场强度为1.5 T时，强度较未处理样品最小下降0.36%；对于拉伸性能而言，当磁脉冲强度为1.5 T时，抗拉强度和延伸率同时得到最大提升,较未处理样品提升4.19%和1.65%,而当磁脉冲强度为0.5和1.0 T时样品无明显变化。对样品微观组织进行表征，观察到样品中的缺陷分布改变，出现晶界处位错向晶胞内移动，形成小位错的聚集和不完整的位错胞壁；PMT对微观缺陷的调控改善了样品的拉伸性能。

Abstract:: Pulsed magnetic treatment (PMT) is a convenient, efficient and green posttreatment method, which utilizes magnetic fields to improve the properties of metal materials. In order to study the effect of PMT on the mechanical properties and microstructure of pure nickel (Ni), and to reveal the potential influence mechanism of PMT on ferromagnetic materials, the pure Ni samples were treated with pulsed magnetic fields at different magnetic intensity, and the mechanical properties and microstructure were analyzed before and after the treatment. The experimental results show that the hardness of Ni samples was decreased by PMT of 0.5-1.5 T, with a minimum decrease of 0.36% at a magnetic intensity of 1.5 T. For tensile properties，the maximum increase in tensile strength and elongation was obtained at a magnetic pulse strength of 1.5 T, with increases of 4.19% and 1.65% compared to the untreated one, and with little change at 0.5 and 1.0 T. Changes in the distribution of defects in Ni samples were observed in the microscopic characterization. The dislocations at the grain boundaries moved into the grain cells, forming the aggregation of small dislocations and incomplete dislocation cell walls, and the change of the microscopic defects improved the tensile properties of the pure Ni samples.