Physical and mechanical properties of sintered NdFeB type permanent magnets

Rabinovich, Yu. M.; Sergeev, V. V.; Maystrenko, A. L.; Kulakovsky, V.N.; Szymura, S.; Bala, H.

doi:10.1016/0966-9795(96)00057-x

Cited by 49 publications

(18 citation statements)

References 2 publications

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“…Horton et al [1,2] examined the mechanical properties of Nd-Fe-B magnet in dependence of different processing routes and Rabinovich et al [3] checked the strength, fracture toughness, Young's modulus, hardness as well as the other physical properties of sintered Nd-Fe-B series with the different composition. The results revealed that the bending strength σ bb measured with three-point-bend method of ternary NdFeB magnets was about 200-250 MPa and the fracture toughness K IC with SENB (single-edge-notched-bend) method was about 2.5-3.7 MPa m 1/2 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and fracture mechanism study of sintered Nd–Fe–B alloy

Liu

2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and fracture mechanism study of sintered Nd–Fe–B alloy

Liu

2008

Journal of Alloys and Compounds

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“…5a, b, it can be seen that the cracks of the two samples mostly propagate along the grain boundaries, that is, they all exhibit the completely brittle fracture characteristic in intergranular way. This is because that the strength of the Nd-rich phase is much lower than that of the main phase [16]. The interfacial strength between the two main grains can be decreased by the Nd-rich phase.…”

Section: Fracture Mechanism Analysismentioning

confidence: 92%

Brittleness and fracture mechanism of sintered Dy-doped NdFeB magnets

et al. 2015

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The brittleness and fracture behaviors of the sintered and the two-stage aged Dy-doped NdFeB magnets were studied by a unique method of acoustic emission testing and Vickers hardness indentation method in this paper. A detailed analysis on the crack propagation mechanism along the grain boundary of the main grain phase (Nd, Dy) 2 Fe 14 B was done. By comparing the acoustic emission energy count value (E n ) with the Vickers hardness indentation load (P), it is shown that there is a linear relationship between E n and P for both the sintered and the two-stage aged Dy-doped NdFeB magnets. According to the slope of E n versus P linear lines, it can be found that the two-stage aged Dy-doped NdFeB magnet is more brittle than the sintered one. It is due to that the Ndrich grain boundary phase of the two-stage aged Dy-doped NdFeB magnet is formed as thin film and uniformly distributes around the main grain phase, which plays a significant role in increasing the intrinsic coercive force of the magnet, but decreasing its interface binding strength. Therefore, the resistance of crack propagation along the grain boundary decreases and the brittleness increases.

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“…While sintered NdeFeeB magnets are not as brittle as the previous high energy density magnets, SmCo 5 and Sm 2 Co 17 [3], it is rather brittle. Due to its brittleness, a high dimensional-accuracy of NdeFeeB magnet can be obtained usually only by grinding operations rather by conventional cutting and so on.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties of sintered NdeFeeB magnet have attracted researchers' attention in recent years at the aim of improving its workability and increasing its dynamic applications. The fracture toughness of the commercial NdeFeeB magnets has been studied [4,5]. Jiang et al studied the influence of alloying elements on the mechanical properties, and found that Cu, Co, and Nb additions improved the strength of sintered NdeFeeB magnets [6].…”

Section: Introductionmentioning

confidence: 99%