Quantitative evaluation on wear resistance of aluminum alloy composites densely packed with SiC particles

Zou, Xiuliang; Miyahara, Hirofumi; Yamamoto, Kazuya; Ōgi, Keisaku

doi:10.1179/026708303225006015

“…Such a result is consistent with the results of XRD and chemical analysis by earlier investigators. [9,10,18,19] Figures 3(a) and (b) show SEM micrographs of the Al20Si alloy extruded bars, with the particle sizes of Ͻ26 m and 45 to 106 m, respectively. It may be noted that the microstructure in Figure 3(a) is very fine due to the combination of initial fine powders and the severe plastic deformation experienced by them during the hot extrusion process.…”

Section: A Microstructure Of the Powders And Extruded Barsmentioning

confidence: 99%

Mechanical properties and fracture behavior of an ultrafine-grained Al-20 wt pct Si alloy

Hong

¹

,

Suryanarayana

²

2005

Metall Mater Trans A

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The effect of powder particle size on the microstructure, mechanical properties, and fracture behavior of Al-20 wt pct Si alloy powders was studied in both the gas-atomized and extruded conditions. The microstructure of the as-atomized powders consisted of fine Si particles and that of the extruded bars showed a homogeneous distribution of fine eutectic Si and primary Si particles embedded in the Al matrix. The grain size of fcc-Al varied from 150 to 600 nm and the size of the eutectic Si and primary Si was about 100 to 200 nm in the extruded bars. The room-temperature tensile strength of the alloy with a powder size Ͻ26 m was 322 MPa, while for the coarser powder (45 to 106 m), it was 230 MPa. The tensile strength of the extruded bar from the fine powder (Ͻ26 m) was also higher than that of the Al-20 wt pct Si-3 wt pct Fe (powder size: 60 to 120 m) alloys. With decreasing powder size from 45 to 106 m to Ͻ26 m, the specific wear of all the alloys decreased significantly at all sliding speeds due to the higher strength achieved by ultrafine-grained constituent phases. The thickness of the deformed layer of the alloy from the coarse powder (10 m at 3.5 m/s) was larger on the worn surface in comparison to the bars from the fine powders (5 m at 3.5 m/s), attributed to the lower strength of the bars with coarse powders.

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“…10, the wear loss of the W-CNTs/Cu composites increases with increasing applied load. According to Archard's formula [16]:…”

Section: The Influence Of Applied Load On the Friction And Wear Propementioning

confidence: 99%

Friction and wear properties of copper matrix composites reinforced by tungsten-coated carbon nanotubes

Nie

¹

,

Jia

²

,

Chen

³

et al. 2011

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Carbon nanotubes (CNTs) were coated by tungsten layer using metal organic chemical vapor deposition process with tungsten hexacarbonyl as a precursor. The W-coated CNTs (W-CNTs) were dispersed into Cu powders by magnetic stirring process and then the mixed powders were consolidated by spark plasma sintering to fabricate W-CNTs/Cu composites. The CNTs/Cu composites were fabricated using the similar processes. The friction coefficient and mass wear loss of W-CNTs/Cu and CNTs/Cu composites were studied. The results showed that the W-CNT content, interfacial bonding situation, and applied load could influence the friction coefficient and wear loss of W-CNTs/Cu composites. When the W-CNT content was 1.0 wt.%, the W-CNTs/Cu composites got the minimum friction coefficient and wear loss, which were decreased by 72.1% and 47.6%, respectively, compared with pure Cu specimen. The friction coefficient and wear loss of W-CNTs/Cu composites were lower than those of CNTs/Cu composites, which was due to that the interfacial bonding at (W-CNTs)-Cu interface was better than that at CNTs-Cu interface. The friction coefficient of composites did not vary obviously with increasing applied load, while the wear loss of composites increased significantly with the increase of applied load.

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“…Such a result is consistent with the results of XRD and chemical analysis by earlier investigators. [9,10,18,19] Figures 3(a) and (b) show SEM micrographs of the Al-20Si alloy extruded bars, with the particle sizes of Ͻ26 m and 45 to 106 m, respectively. It may be noted that the microstructure in Figure 3(a) is very fine due to the combination of initial fine powders and the severe plastic deformation experienced by them during the hot extrusion process.…”

Section: A Microstructure Of the Powders And Extruded Barsmentioning

confidence: 99%

“…The wear resistance of the composites has increased with the volume fraction of the SiC particles. [9,10] Of all the processes mentioned previously, rapid solidification of metallic melts has been known to produce altered constitutional effects such as formation of supersaturated solid solutions, metastable intermetallic phases, and even amorphous alloys. [11][12][13][14][15][16] Additionally, the microstructural features (grain size and size of second-phase/intermetallic particles) are considerably refined and segregation effects are significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and fracture behavior of an ultrafine-grained Al-20 wt pct Si alloy

Hong

¹

,

Suryanarayana

²

2005

Metall Mater Trans A

View full text Add to dashboard Cite

The effect of powder particle size on the microstructure, mechanical properties, and fracture behavior of Al-20 wt pct Si alloy powders was studied in both the gas-atomized and extruded conditions. The microstructure of the as-atomized powders consisted of fine Si particles and that of the extruded bars showed a homogeneous distribution of fine eutectic Si and primary Si particles embedded in the Al matrix. The grain size of fcc-Al varied from 150 to 600 nm and the size of the eutectic Si and primary Si was about 100 to 200 nm in the extruded bars. The room-temperature tensile strength of the alloy with a powder size Ͻ26 m was 322 MPa, while for the coarser powder (45 to 106 m), it was 230 MPa. The tensile strength of the extruded bar from the fine powder (Ͻ26 m) was also higher than that of the Al-20 wt pct Si-3 wt pct Fe (powder size: 60 to 120 m) alloys. With decreasing powder size from 45 to 106 m to Ͻ26 m, the specific wear of all the alloys decreased significantly at all sliding speeds due to the higher strength achieved by ultrafine-grained constituent phases. The thickness of the deformed layer of the alloy from the coarse powder (10 m at 3.5 m/s) was larger on the worn surface in comparison to the bars from the fine powders (5 m at 3.5 m/s), attributed to the lower strength of the bars with coarse powders.SOON-JIK HONG, Postdoctoral Research Fellow, and C. SURYANARAYANA, Professor, are with the

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Quantitative evaluation on wear resistance of aluminum alloy composites densely packed with SiC particles

Cited by 10 publications

References 17 publications

Mechanical properties and fracture behavior of an ultrafine-grained Al-20 wt pct Si alloy

Mechanical properties and fracture behavior of an ultrafine-grained Al-20 wt pct Si alloy

Friction and wear properties of copper matrix composites reinforced by tungsten-coated carbon nanotubes

Mechanical properties and fracture behavior of an ultrafine-grained Al-20 wt pct Si alloy

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