Grain Size Effect of Bulk Nanocrystalline Pr 0.5 Nd 0.5 (Fe 0.75 Co 0.1 Cu 0.01 Nb 0.04 Si 0.05 B 0.05 ) 1.93 Alloy Synt
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ORIGINAL PAPER
Grain Size Effect of Bulk Nanocrystalline Pr0.5 Nd0.5 (Fe0.75 Co0.1 Cu0.01 Nb0.04 Si0.05 B0.05 )1.93 Alloy Synthesized Under Ultrahigh Pressure Cheng-Chao Hu1 Yang-Guang Shi3
· Zhao Zhang1 · Jing-Jing Jiao1 · Li-Chao Cai2 · Peng Fu1 · Hui Chen1 · Jun-Jie Ni1 · Wei Li1 ·
Received: 30 August 2020 / Accepted: 15 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Based on the light-rare-earth anisotropic compensation system, bulk nanocrystalline Pr0.5 Nd0.5 (Fe0.75 Co0.1 Cu0.01 Nb0.04 Si0.05 B0.05 )1.93 magnetostrictive alloys were synthesized by annealing its melt-spinning ribbons under different ultrahigh pressures. It was demonstrated that high-pressure annealing could effectively synthesize the wanted magnetostrictive phase and control the grain growth of Pr0.5 Nd0.5 (Fe0.75 Co0.1 Cu0.01 Nb0.04 Si0.05 B0.05 )1.93 bulk nanocrystals. The average grain size decreased with annealing pressure increasing from 3 to 8 GPa, accompanied by a decrease in coercivity. The volume fraction of the cubic Laves phase, as well as grain size, synergistically affected the magnetoelastic response of the investigated bulk nanocrystalline magnetostrictive alloys. This work gives us an insight into the microstructure controlling of the bulk nanocrystalline magnetostrictive materials and provides a way to select suitable bulk nanocrystals to meet the different magnetostrictive applications. Keywords Cubic Laves phase · Magnetostriction · Bulk nanocrystalline
1 Introduction Giant magnetostrictive materials, as modern smart materials, have been playing an increasingly more critical role in many applications, such as ultrasensitive sensors, high energy density actuators, and acoustic transducers [1]. The cubic Laves phase RFe2 (R = rare earth) alloys are well known to exhibit giant magnetostrictive response [2]. However, for practical applications, the minimum anisotropy is required to meet the ultrasensitive magnetostriction under low applied fields. In the 1960s, through the anisotropy compensation between the two heavy-rare-earth-based RFe2 -type alloys of TbFe2 and DyFe2 , A.E. Clark firstly found the pseudobinary Tb0.27 Dy0.73 Fe2 giant magnetostrictive compound. In Cheng-Chao Hu
[email protected] 1
School of Materials Science and Engineering, Liaocheng University, Liaocheng, 252059, China
2
Junrui Super-hard Material CO., LTD, Liaocheng, 252059, China
3
Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
the following decades, much work has focused on the exploration of anisotropic compensation systems, such as Tbx Dy1−x Fe2 , Tbx Ho1−x Fe2 and Tbx Dyy Ho1−x−y Fe2 [2–5]. Subsequently, single crystals or textured pseudobinary RFe2 -type alloys [6] were also developed for the purpose of further improving the magnetostrictive properties at low fields. However, the raw materials of these giant magnetostrictive materials in the previous work are mostly expensive heavy rare earth Tb, Dy or Ho, which limits their wide a
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