Si microalloying optimizes the thermal stability, crystallization behaviors and magnetic properties of Fe-rich Fe-B-Cu-Hf alloys

In compared with single component aerogel, hybrid aerogel with multi-components possessing enhanced properties, especially high thermal stabilities which are our concerns in this paper, are the promised materials in various applications. However, how the mixing between variable components within hybrid aerogel affects their properties still not very clear and needs more research efforts. In the present research, we chose a ZrO2/SiO2 hybrid aerogel as represent to study their mixing and the resulted thermal stabilities. We designed a series of ZrO2/SiO2 hybrid aerogels with variable ZrO2/SiO2 ratio deriving from tailored sol-gel parameters, and then studied their shrinkages, nanopore collapses and crystallization behaviors upon heat-treatment.

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Effects of La on Thermal Stability, Phase Formation and Magnetic Properties of Fe–Co–Ni–Si–B–La High Entropy Alloys

Metals ◽

10.3390/met11121907 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1907

Author(s):

Jiaming Li ◽

Jianliang Zuo ◽

Hongya Yu

Keyword(s):

Thermal Stability ◽

Magnetic Properties ◽

Saturation Magnetization ◽

Phase Formation ◽

Crystallization Temperature ◽

High Entropy Alloys ◽

Soft Magnetic Properties ◽

Soft Magnetic ◽

High Entropy ◽

Bcc Phase

The microstructure, phase formation, thermal stability and soft magnetic properties of melt-spun high entropy alloys (HEAs) Fe27Co27Ni27Si10−xB9Lax with various La substitutions for Si (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) were investigated in this work. The Fe27Co27Ni27Si10−xB9La0.6 alloy shows superior soft magnetic properties with low coercivity Hc of ~7.1 A/m and high saturation magnetization Bs of 1.07 T. The content of La has an important effect on the primary crystallization temperature (Tx1) and the secondary crystallization temperature (Tx2) of the alloys. After annealing at relatively low temperature, the saturation magnetization of the alloy increases and the microstructure with a small amount of body-centered cubic (BCC) phase embedded in amorphous matrix is observed. Increasing the annealing temperature reduces the magnetization due to the transformation of BCC phase into face-centered cubic (FCC) phase.

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Thermal Stability of Magnetic Properties in Dehydrogenated Triarylmethane Resins

MRS Proceedings ◽

10.1557/proc-173-71 ◽

1989 ◽

Vol 173 ◽

Author(s):

Michiya Otani ◽

Sugio Otani

Keyword(s):

Thermal Stability ◽

Magnetic Properties ◽

Magnetic Property ◽

Room Temperature ◽

Permanent Magnets ◽

Elevated Temperatures ◽

Mechanical Response ◽

The Stability ◽

Thermal Stability Of

ABSTRACTThe stability of the magnetic properties of dehydrogenated triaryl-methane resins was investigated both at room temperature and at elevated temperatures. A magnetic property different from that reported in a previous paper was found in the course of studying the reproducibility of synthesis. This new property was examined through a mechanical response of the resins to a set of permanent magnets.

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