Reobservations of Recrystallization and its Eeffect on Mechanical and Magnetic Propertiesin a Severely Cold-Rolled Ni-Based Soft Magnetic Alloy

Archives of Metallurgy and Materials

article

Azizeh Mahdavi¹  Ali Reza Mashreghi¹  Saeed Hasani¹  Mohammad Reza Kamali¹ 

[1] Yazd University, Department of Mining and Metallurgical Engineering

关键词: Ni-based alloy;    Soft magnet;    Recrystallization;    Microstructural characterization;    Mechanical properties;    Coercivity;   

DOI  :  10.24425/amm.2022.137809

学科分类：物理（综合）

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Despite of extensive researches for decades, there are many unclear aspects for recrystallization phenomenon in the coldrolled Ni-based alloys. Hence, different thermal cycles were conducted in order to determine microstructural evolutions and itseffect on the magnetic and mechanical properties of a 90% cold-rolled thin sheet of a Ni-Fe-Cu-Mo alloy (~80 μm). The obtainedresults revealed that the recrystallization was started at a temperature of 550°C and was completed after 4 hours. An increase in thenumber of annealing twins was observed with an increase in annealing temperature, which was due to a bulging and long-rangemigration of grain boundaries during the discontinuous recrystallization. Ordering transformation occurred in the temperaturerange of 400-600°C and as a result, hardness, yield strength, and UTS were increased, while with an increase in the annealingtemperature these mechanical properties were decreased. Maximum toughness was obtained by annealing at 550°C for 4 hours,while the highest elongation was obtained after annealing at 1050°C, where other mechanical properties including toughness, hardness, yield strength, and UTS were decreased due to the grain growth and secondary recrystallization. Moreover, coercivity andremanence magnetization were decreased from 4.5 Oe and 3.8 emu/g for the cold rolled sample to below 0.5 Oe and 0.15 emu/gfor the sample annealed at 950°C, respectively.

【 授权许可】

CC BY-NC