Mechanical properties and fracture behavior of an NbSS/Nb5Si3 in-situ composite modified by Mo and Hf alloying

Kim, Jin-Hak; Tabaru, Tatsuo; Sakamoto, Michiru; Hanada, Shuji

doi:10.1016/j.msea.2003.12.010

Cited by 68 publications

(33 citation statements)

References 35 publications

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“…13,14) Among all the toughening phases, the ductile refractory metals has been proved to be an ideal choice for intermetallic composites, having a high melting point exceeding 2000 C, ductility and toughness. [15][16][17] Such inverse intermetallic composites, with fracture toughness improved by ductile refractory metals, exhibit unique wear behaviours, which may somewhat offset any deleterious effect associated with the decrease in hardness. 18) In the light of this understanding, the in-situ incorporation of the ductile refractory metal phase into intermetallic composites has been conducted in a ternary Mo-Ni-Si system to form a novel multi-phase microstructure in this work.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Resistance of a Novel Mo-Ni-Si System Intermetallic Composite with Ductile Mo Phase

et al. 2016

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It has been a challenge to improve the toughness of intermetallic compound at low and medium temperatures for developing wear resistance materials. The refractory metals, with a high melting point, strong atomic bonds, high ductility and toughness, are ideal toughening phases for intermetallic composites. This paper presents a novel composite having the microstructure of ductile Mo primary dendrites, binary intermetallic compound NiMo and ternary metallic silicide Mo 2 Ni 3 Si. The composite exhibits outstanding wear resistance and pretty low wear-load coef cient at ambient temperature, which are attributed to the contribution of refractory metal Mo to toughness of intermetallic matrix, in addition to the high strength and hardness of binary NiMo and ternary Mo 2 Ni 3 Si intermetallic phases. The wear mechanism analyzed by examining the worn surface and debris morphologies is in terms of soft abrasive wear.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Resistance of a Novel Mo-Ni-Si System Intermetallic Composite with Ductile Mo Phase

et al. 2016

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“…However, the poor oxidation resistance and undesired room-temperature fracture toughness restrict its industrial application. To solve these problems, many methods have been applied and some niobium silicide based alloys have been developed [6][7]. Among these alloys, the Nb-Ti-Si-Cr-Al-Hf alloy is the most promising one which makes use of the Nb solid solution (Nbss) ductile phase as the matrix and the Nb 5 Si 3 as strengthening phase [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of a Directionally Solidified Nb-Ti-Si-Cr-Al-Hf-Dy Alloy

Sheng

2016

MATEC Web Conf.

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Abstract. The Nb-Ti-Si-Cr-Al-Hf-Dy alloy was prepared by conventionally casting and then directionally solidified (DS) with the optical floating zone melting technology. Microstructural evolution and mechanical properties of the as cast (AC) and DS alloys were studied by XRD, SEM, TEM, compression and bending tests. The results exhibit that Į-(Nb,Ti) 5 Si 3 , (Ti,Nb) 5 Si 3 and (Nb,Ti)ss phases formed the microstructure of the AC alloy, with precipitates of Cr 2 Nb, Dy 2 O 3 and (Nb,Ti) 3 Si along phase or grain boundaries. The DS alignes (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 lamellae parallel to the growth direction and refines the eutectic cell, but coarsens the primary Į-(Nb,Ti) 5 Si 3 phase. The DS alloy exhibits strong orientation of (310) (Nb,Ti)5Si3 and (110) (Nb,Ti)ss along the growth direction. TEM observation reveals that (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 phases have an orientation relationship of [110] (Nb,Ti)ss // [310] Į-(Nb,Ti)5Si3 and (002) (Nb,Ti)ss // (002) Į-(Nb,Ti)5Si3 . Compared with the AC alloy, the DS increases the mechanical properties of the alloy obviously and the alloy DS at 8 mm/h exhibits the best mechanical properties.

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“…[1][2][3][4][5][6] Among them, transition and refractory metal silicide are demonstrated to have better tribological properties because of not only their inherent high hardness and unique covalentdominant strong atomic bonds but also abnormal hardnesstemperature relation (higher hardness and strength at elevated temperature than those under ambient temperature). [7][8][9][10] However, a relatively poor ductility and fracture toughness are currently a serious drawback restricting metal silicides from industrial applications, 11,12 but may be improved by suitable optimization of composite microstructures or use of innovative processing routes. A great deal of works on improvement of ductility and toughness has been carried out for binary refractory metal-based metal silicides in Mo-Si, W-Si, and Nb-Si systems, and so on.…”

Section: Introductionmentioning

confidence: 99%

Elevated-temperature wear behaviors of NiMo/Mo₂Ni₃Si intermetallic “in situ” composites

et al. 2015

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Intermetallic composite has been expected to be one kind of high-performance wear material at elevated temperature due to its inherent high hardness and strong atomic bonds. This paper presents the wear behaviors under elevated temperature conditions of NiMo/Mo 2 Ni 3 Si intermetallic "in situ" composite. Metallographic observations were carried out with optical microscope and scanning electron microscope. Elevated-temperature wear tests were performed under pin-on-disc mode dry sliding conditions. Results shown that the relative wear resistant property of NiMo/Mo 2 Ni 3 Si alloys at 500°C is over 7 times, and become higher at 550°C compared with austenitic 1Cr18Ni9Ti stainless steel. The effect of temperature and applied load on elevated-temperature wear resistance of alloy was evaluated. The corresponding wear mechanism is also reported through examining the worn surface, subsurface, and wear debris of the NiMo/Mo 2 Ni 3 Si intermetallic alloys which is found to be soft abrasive wear.

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Mechanical properties and fracture behavior of an NbSS/Nb5Si3 in-situ composite modified by Mo and Hf alloying

Cited by 68 publications

References 35 publications

Microstructure and Wear Resistance of a Novel Mo-Ni-Si System Intermetallic Composite with Ductile Mo Phase

Microstructure and Wear Resistance of a Novel Mo-Ni-Si System Intermetallic Composite with Ductile Mo Phase

Microstructure Evolution and Mechanical Properties of a Directionally Solidified Nb-Ti-Si-Cr-Al-Hf-Dy Alloy

Elevated-temperature wear behaviors of NiMo/Mo₂Ni₃Si intermetallic “in situ” composites

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Mechanical properties and fracture behavior of an NbSS/Nb5Si3 in-situ composite modified by Mo and Hf alloying

Cited by 68 publications

References 35 publications

Microstructure and Wear Resistance of a Novel Mo-Ni-Si System Intermetallic Composite with Ductile Mo Phase

Microstructure and Wear Resistance of a Novel Mo-Ni-Si System Intermetallic Composite with Ductile Mo Phase

Microstructure Evolution and Mechanical Properties of a Directionally Solidified Nb-Ti-Si-Cr-Al-Hf-Dy Alloy

Elevated-temperature wear behaviors of NiMo/Mo2Ni3Si intermetallic “in situ” composites

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Elevated-temperature wear behaviors of NiMo/Mo₂Ni₃Si intermetallic “in situ” composites