Effect of Mo addition on magnetic properties of Fe–28Cr–15Co hard magnets

Ahmad, Zubair; Haq, Anwar Ul; Husain, Syed Wilayat; Abbas, Tahir

doi:10.1016/s0921-4526(02)00830-x

Cited by 20 publications

(7 citation statements)

References 9 publications

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“…The samples were then magnetically treated in order to achieve an HCS due to decomposition of the solid α-solution into the isomorphous α 1 - and α 2 -phases. The formation of a such structure, in which each precipitate of the α 1 -phase is a single magnetic domain, provides superior magnetic properties [11].…”

Section: Resultsmentioning

confidence: 99%

“…A high coercive state of the Fe–Cr–Co system alloys is obtained as the result of magnetic treatment with multistage tempering. The decomposition of the solid α solution into the coherent and ordered precipitates of the α 1 - and α 2 -phases is observed after magnetic treatment [11]. Such a microstructure, in which each precipitate of the α 1 -phase is a single magnetic domain, ensures superior magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Some Properties of Hard Magnetic FeCr30Co8 Alloy Subjected to Torsion Combined with Tension

et al. 2019

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The hard magnetic alloy FeCr30Co8 alloy was subjected to severe plastic deformation (SPD) by torsion combined with tension in the temperature range of 750 °C to 850 °C. This range of deformation temperatures corresponds to the α solid solution on the Fe–Cr–Co phase diagram. The study of the alloy after SPD by means of X-ray diffraction (XRD) and scanning and transmission electron microscopy techniques showed the formation of a gradient microstructure with fine grain size in the surface layer and precipitation of the hard intermetallic σ-phase. Next, the magnetic and mechanical properties of the deformed alloy after short annealing at 1000 °C and magnetic treatment were studied. A slight decrease in coercive force was found, along with a significant gain in plasticity and strength. The effective deformation temperature was determined to obtain the optimal magnetic and mechanical characteristics of the alloy. This method of deformation can be applied for the improvement of the mechanical properties of some magnets (high-speed rotors) which should have good magnetic properties within their volume while maintaining good mechanical properties on the surface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Some Properties of Hard Magnetic FeCr30Co8 Alloy Subjected to Torsion Combined with Tension

et al. 2019

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“…Many researchers attribute magnetic alloys' predisposition to cracking when processed by grinding to their magnetic and crystal structure features, designed to obtain high magnetic properties [14,15]. The presence of stress concentrators in the surface layer of the ground products, which include various kinds of defects introduced in obtaining the workpiece and subsequent types of processing, fundamentally complicates the study of cracking causes [16,17].…”

Section: Methodsmentioning

confidence: 99%

Impact of the Heterogeneous Structure of Magnetic Hard Alloys on the Quality Characteristics of the Surface Layer During Grinding Processing

Kunitsyn

Usov

Sikirash

2021

Lecture Notes in Mechanical Engineering

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The article deals with fragments of technological heredity, which is the basis of a new scientific and practical direction in mechanical engineering technology aimed at improving machine parts' performance by technological methods in manufacturing parts. The purpose is to study thermomechanical phenomena affecting the quality of the surface layer, taking into account the processing of products and genetic heterogeneities formed in previous technological operations, to establish the influence of these inhomogeneities on crack and burn formation based on quantitative analysis of the thermal and stress state, as well as with taking into account the heterogeneity of the material of the products. The problem of determining the stress-strain state of a piecewise homogeneous product material, the upper layer containing thin inclusions and crack-like defects, and the active layer of which is subject to mechanical processing, is considered. It was found that the presence of various defects in the surface layer of the processed products, introduced at the stage of obtaining the workpiece and subsequent types of processing, requires the formulation of fracture mechanics criteria in the study of the causes of crack formation.

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“…The alloy preparation is described elsewhere [9]. It was observed that the addition of Mo above 3.5 wt% produced undesirable sigma phase that makes the alloy brittle in the cast state and could not be investigated further.…”

Section: Methodsmentioning

confidence: 99%

Grain size effect on magnetic properties of Fe–28Cr–15Co permanent magnets as a function of Mo content

Ahmed¹,

Haq²

2004

phys. stat. sol. (c)

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The Fe-28Cr-15Co-(1-4)Mo magnetic alloys were studied using X-ray diffraction, optical microscopy, transmission electron microscopy and magnetometery techniques. Permanent magnets were produced by employing thermo-magnetic aging process. The Fe-28Cr-15Co-3.5Mo alloys produced the optimum magnetic properties as coercive force = 840 Oe (66.83 kA/m), remanence = 11 kG (1.1 T), saturation magnetization = 12.5 kG (1.25 T) and energy product = 5.4 MGOe (43 kJ/m 3 ). Molybdenum content above 3.5 wt% produced cracking and brittleness in the alloys due to the formation of unwanted σ phase. The results indicates that molybdenum content from 1 to 3.5 wt% extends the ferromagnetic α grain structure at annealed state and affects the particle size, amount and shape anisotropy of the strongly magnetic α 1 phase that in turn improves the magnetic properties of the ternary Fe-28Cr-15Co alloys.

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Effect of Mo addition on magnetic properties of Fe–28Cr–15Co hard magnets

Cited by 20 publications

References 9 publications

Microstructure Evolution and Some Properties of Hard Magnetic FeCr30Co8 Alloy Subjected to Torsion Combined with Tension

Microstructure Evolution and Some Properties of Hard Magnetic FeCr30Co8 Alloy Subjected to Torsion Combined with Tension

Impact of the Heterogeneous Structure of Magnetic Hard Alloys on the Quality Characteristics of the Surface Layer During Grinding Processing

Grain size effect on magnetic properties of Fe–28Cr–15Co permanent magnets as a function of Mo content

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