Microstructure, Properties and Wear Behaviors of (Ni3Al)p Reinforced Cu Matrix Composites

Çelikyürek, İ̇brahim; Körpe, Neşe Öztürk; olcer, Tugba; Gürler, R.

doi:10.1016/s1005-0302(11)60167-9

Cited by 47 publications

(11 citation statements)

References 24 publications

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“…The friction coefficient shown by Cu4Ni was the lowest, whereas that by Cu4Ni-8TiC was the highest at all the normal loads. The similar observations were reported by Celikyurek et al [27].…”

Section: Friction and Wear Behaviorsupporting

confidence: 92%

Friction and wear behavior of Cu–4 wt.%Ni–TiC composites under dry sliding conditions

2017

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Abstract:The present study synthesized Cu-4 wt% Ni matrix composites reinforced with different percentages of TiC (0, 2, 4, 6, and 8 wt%) through high-energy ball milling, followed by compaction and sintering. The friction and wear behavior was examined at four different normal loads of 5, 10, 15, and 20 N. A constant sliding speed of 1.25 m/s was maintained while sliding against a hardened counterface made of EN31 steel (HRC 60) under ambient conditions using a pin-on-disk test rig. The composite hardness increased until the addition of 4 wt% of TiC, beyond which it was observed to decrease. Such a trend may be attributed to the TiC agglomeration in the composites containing relatively larger amounts of TiC (i.e., 6 and 8 wt%). The wear rate linearly increased with the load. However, the composites exhibited a lower rate of wear than the matrix alloy, which may have resulted from the relatively higher hardness of composites. The observed friction and wear behavior has been explained on the basis of hardness and presence of the transfer layer on the worn surface and its nature, i.e., loose or well compacted. Addition of 4 wt% TiC showed the optimum performance in terms of friction and wear caused by its higher hardness and ability to hold a transfer layer of a relatively larger thickness compared to the other materials. The wear mechanism for the Cu4Ni matrix alloy was a mix of adhesive and oxidative wear and primarily abrasive for the composites containing hard TiC particles.

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Section: Friction and Wear Behaviorsupporting

confidence: 92%

Friction and wear behavior of Cu–4 wt.%Ni–TiC composites under dry sliding conditions

2017

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“…It is well known that the pure copper has poor mechanical properties and high thermal expansion coefficient [1][2][3][4]. Therefore, one of the potential solutions for these drawbacks is the incorporation of a reinforcement element, which results in copper matrix composite as a by-product [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of Ultrafine YSZ Reinforced Cu Matrix Functionally Graded Composite

Mirazimi

Abachi

Purazrang

2016

Acta Metall. Sin. (Engl. Lett.)

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Copper matrix composites have received more attentions as possible candidate for thermal and electrical conductive materials to be used in electrical contact applications. In this study, five-layered Cu/YSZ (yttria-stabilized zirconia) functionally graded material (FGM) and copper matrix composite specimens containing 3 and 5 vol% YSZ particles plus pure Cu specimen were synthesized using powder metallurgy (PM) route and spark plasma sintering (SPS) consolidation process. The microstructural and some physical, mechanical features of all specimens were characterized. Microscopic examinations showed that ultrafine YSZ particles were distributed in the copper matrix almost homogeneously. An appropriate interface was observed at each layer of FGM. The density measurement indicated that the graded structure of the composite could be well densified after the SPS process. The microhardness values of various layers of Cu/ YSZ FGM specimen were gradually altered from 56.3 (pure copper side) to 75.2 HV (Cu-5 vol% YSZ side). The increase of YSZ content resulted in a decrease in electrical conductivity. Additionally, thermal conductivity of Cu/YSZ FGM specimen [308.0 W/(m K)] was determined to be higher than that of the Cu-5 vol% YSZ composite specimen [260.7 W/ (m K)]. Accordingly, it can be concluded that the Cu/YSZ FGM can be a good candidate for the electrical applications, like sliding electrical contacts, where different material characteristics in the same component are required.

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“…[2 - 5]. Упрочнение материалов твердыми фазами может увеличить усталостную прочность только в некоторых случаях [6,7]. Применение сплавов со сложным элементным составом не всегда может быть убедительно обосновано [8,9].…”

Section: Introductionunclassified

Оn wear resistance of steel-containing composites under extreme friction conditions

Fadin

Колубаев

Aleutdinova

2019

Izv. vysš. učebn. zaved., Čern. metall.

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The interrelation between the mechanisms of surface layer deterioration of powder composites and the elemental compositions of their primary structures under extreme conditions of friction was studied. Extreme conditions were set by sliding under high pressure (higher 100 MPa) in boundary lubrication or by dry sliding under high density electric current (higher 100 A/cm2). It caused plastic deformation of the surface layers and their deterioration due to lowcycle fatigue. High wear resistance of materials in such conditions should be achieved due to satisfactory stress relaxation in the surface layers. It was suggested that stresses should be relaxed due to local plastic deformation in vicinity of the emerging stress concentrators. The ease of plastic deformation (and ease of relaxation) should be ensured by reducing the doping of the composites structural components, i.e. due to the lack of solid solutions. It was shown that the composites having the Cu – steel (alloy) – TiC compositions obtained by the method of self-propagating high-temperature synthesis with simultaneous pressing of the burning charge had strong adhesion in the sliding contact and showed low wear resistance under high pressures boundary friction. The absence of solid solutions in the primary structure of the Cu – Fe – TiC composite corresponded to high wear resistance due to the absence of adhesion in the contact and easy stress relaxation. Composites of Cu – steel-graphite compounds, made by sintering in vacuum, showed strong adhesion in a dry sliding electrical contact and low wear resistance due to the high content of alloying elements. It was noted that the absence of solutions in the composite composition of Cu – Fe – graphite caused the absence of adhesion in contact and the corresponding high wear resistance. In addition, stresses in the surface layer were also relaxed by the formation of FeO oxide in the contact space during sliding with the current collector. Composites containing solid solutions were not capable of forming FeO oxide on the sliding surface. It was an additional reason for the low wear resistance realization. It was noted that solid solutions caused a decrease in the thermal conductivity of the surface layer. Therefore, it led to an increase in temperature gradients on the sliding surface and to a сorresponding acceleration of the friction zone deterioration.

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Microstructure, Properties and Wear Behaviors of (Ni3Al)p Reinforced Cu Matrix Composites

Cited by 47 publications

References 24 publications

Friction and wear behavior of Cu–4 wt.%Ni–TiC composites under dry sliding conditions

Friction and wear behavior of Cu–4 wt.%Ni–TiC composites under dry sliding conditions

Spark Plasma Sintering of Ultrafine YSZ Reinforced Cu Matrix Functionally Graded Composite

Оn wear resistance of steel-containing composites under extreme friction conditions

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