Magnetic precipitation hardening and Bloch-wall pinning in an 85Co-12Fe-3Nb alloy
Magnetic precipitation hardening and Bloch-wall pinning in an 85Co-12Fe-3Nb alloy
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DOI：
10.1063/1.325380
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发表时间：
1978-07
影响因子：
3.2
通讯作者：
G. Prokop;W. Soffa
中科院分区：
文献类型：
--
作者：
G. Prokop;W. Soffa
研究了固溶淬火85Co-12Fe-3Nb合金等温时效过程中本征矫顽力的发展。测量了磁滞回线、初始磁化率和磁化强度，为确定矫顽力发展机制提供了信息。连续的磁滞回线清楚地表明，在该合金中，布洛赫壁钉钉在反转机制中占主导地位。等温时效时的最大矫顽力分别为21.5、33和37 Oe，分别为800、750和700 /sup 0/C。最大矫顽力下的显微组织由沿铁磁基体的111面形成的类似Co/sub 3/Nb相的Widmanstaetten板组成。在最低时效温度700 /sup 0/C下，亚稳态有序L1/sub 2/…与固溶处理的样品相比，在早期时效时间形成的相导致矫顽力显著增加。与…γ…相关的周期性微观结构’阶段也导致极低的初始敏感性。经过长时间的老化，…被Widmanstaetten沉淀所取代。在750和800 /sup 0/C长时效时间下矫顽力的下降是魏德曼氏形貌持续粗化的结果。合金经周期性…γ…显微组织表现为非均匀壁钉行为，而经Widmanstaetten相硬化的合金表现为非均匀壁钉行为。«少
The development of intrinsic coercivity during isothermal aging of a solution treated and quenched 85Co-12Fe-3Nb alloy was studied. The hysteresis loops, initial susceptibility, and magnetization were also measured and provided information for identifying the mechanism of coercivity development. Successive hysteresis loops clearly demonstrate that Bloch-wall pinning dominates the reversal mechanism in this alloy. The maximum coercivities found during isothermal aging were 21.5, 33, and 37 Oe at 800, 750, and 700 /sup 0/C, respectively. The microstructure at maximum coercivity consisted of Widmanstaetten plates of a phase similar to Co/sub 3/Nb which formed along the )111) planes of the ferromagnetic matrix. At the lowest aging temperature, 700 /sup 0/C, a metastable ordered L1/sub 2/ ..gamma..' phase formed during the early aging times resulting in a significant increase in the coercivity compared to the solution-treated samples. The periodic microstructure associated with the ..gamma..' phase also resulted in an extremely low initial susceptibility. After prolonged aging, the ..gamma..' was replaced by the Widmanstaetten precipitates. The decrease in coercivity for long aging times at 750 and 800 /sup 0/C was the result of continued coarsening of the Widmanstaetten morphology. The alloys magnetically hardened by the periodic ..gamma..' microstructure exhibited hysteresis behavior indicative of homogeneousmore » wall pinning, whereas the alloys hardened by the Widmanstaetten precipitate showed the behavior characteristic of inhomogeneous wall pinning.« less