文章信息/Info

Title:

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

文章編號:

1674-3962(2024)06-0558-07

作者:

丁雪; 劉劍; 吳明霞; 陳朝浪; 余林濤

1. 四川大學機械工程學院，四川 成都 610065 2. 睿恩光電有限責任公司，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

關鍵詞:

鐵磁材料; 脈沖磁場處理; 硬度; 拉伸性能; 缺陷分布

Keywords:

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

分類號:

TG146.1+5

DOI:

10.7502/j.issn.1674-3962.202311019

文獻標志碼:

A

摘要:

脈沖磁場處理（PMT）是一種便捷高效、綠色環保的后處理方法，可利用脈沖磁場改善金屬材料性能。為了研究PMT對純鎳（Ni）力學性能和微觀組織的影響，揭示PMT對鐵磁性材料的潛在影響機制，采用不同磁場強度PMT對純Ni樣品進行處理，并對處理前后純Ni樣品力學性能、微觀組織進行分析。實驗結果表明，經強度為0.5~1.5 T的PMT后，樣品硬度降低，當脈沖磁場強度為1.5 T時，強度較未處理樣品最小下降0.36%；對于拉伸性能而言，當磁脈沖強度為1.5 T時，抗拉強度和延伸率同時得到最大提升,較未處理樣品提升4.19%和1.65%,而當磁脈沖強度為0.5和1.0 T時樣品無明顯變化。對樣品微觀組織進行表征，觀察到樣品中的缺陷分布改變，出現晶界處位錯向晶胞內移動，形成小位錯的聚集和不完整的位錯胞壁；PMT對微觀缺陷的調控改善了樣品的拉伸性能。

Abstract:

Pulsed magnetic treatment (PMT) is a convenient, efficient and green post�瞭reatment 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.