Microstructural and hardness investigation of an aluminum–copper alloy processed by laser surface melting

Pinto, Maria Aparecida; Cheung, Noé; Ierardi, Maria Clara Filippini; Garcia, Amauri

doi:10.1016/s1044-5803(03)00091-3

Cited by 95 publications

(39 citation statements)

References 15 publications

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“…[10][11][12][21][22][23][24][25] It is generally known that the fabrication of SMMCs by traditional fusion surfacing techniques such as laser beam and thermal spraying may lead to the deterioration of MMCs properties. [26][27][28][29][30] In the case of Al 2 O 3 , the Al 2 O 3 may decompose to Al and oxygen gas (forming porosities) on contact with liquid aluminum in addition to the tendency of the Al 2 O 3 particle to clustering. 30) Similarly, the SiC may react with molten aluminum to form brittle Al 4 C 3 carbide.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Surface-Hybrid-MMCs Layer on Aluminum Plate by Friction Stir Processing and Its Wear Characteristics

et al. 2009

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Aluminum-base hybrid composites reinforced with mixtures of SiC and Al 2 O 3 particles 1.25 mm in average size have been fabricated on an A 1050-H24 aluminum plate by friction stir processing (FSP) and their wear resistance has been investigated as a function of the relative weight ratios of the particles. A mixture of SiC and Al 2 O 3 powders of different weight ratios was packed into a groove of 3 mm width and 1.5 mm depth cut on the aluminum plate, and covered with an aluminum sheet 2 mm thick. A FSP tool of square probe shape, rotated at a speed of 1500 rpm, was plunged into the plate through the cover sheet and the groove, and moved along the groove at a travelling speed of 1.66 mm/s. After the hybrid composite was fabricated on the Al plate, the homogeneity of the particles distribution inside the Al matrix has been evaluated from the macro/microstructure and hardness distribution. Moreover, the wear characteristics of the resulted hybrid composites were evaluated using a ball-on-disc wear tester at room temperatures at normal loads of 2 and 5 N. As a result, it was found that the reinforcement particles were distributed homogenously inside the nugget zone without any defects except some voids that appeared around the Al 2 O 3 particles. The average hardness decreased with increasing the relative content of Al 2 O 3 particles. Regarding the wear characteristics, the wear volume losses of the hybrid composites depended on the applied load and the relative ratio of SiC and Al 2 O 3 particles. The hybrid composite of 80% SiC þ 20% Al 2 O 3 showed superior wear resistance to 100% SiC and Al 2 O 3 or any other hybrid ratios at a normal load of 5 N.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Surface-Hybrid-MMCs Layer on Aluminum Plate by Friction Stir Processing and Its Wear Characteristics

et al. 2009

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“…The intimate contact between the melt and the solid substrate causes a very fast heat extraction during solidification resulting in very high cooling rates of the order of 10 5 to 10 8 k/s. The high cooling rates to which this surface layer is submitted result in the formation of different microstructures from bulk metal leading to improved surface properties (Aparecida Pinto et al, 2003). Materials processed via rapid solidification tend to show advantages of refined microstructure, reduced microsegregation, extensive solid solubility and formation of metastable phases (Munitz, 1985;Zimmermann et al, 1989).…”

Section: Laser Surface Remelting Of Aluminium Alloymentioning

confidence: 99%

“…In untreated surfaces of Al alloys the microsegregation in relatively thin surface layer plays an important role in initiating pitting in the inhomogeneous structures. The schematic of the laser surface melting process is shown in figure 14 (Aparecida Pinto et al, 2003). Some industrial laser sources such as CO 2 , Nd:YAG, excimer and high power diode lasers were applied to surface melting of aluminium alloys.…”

Section: Laser Surface Remelting Of Aluminium Alloymentioning

confidence: 99%

“…The controlling of laser parameters is very important factor for laser surface melting process. Because the properties of a material depend largely on its microstructure, controlled formation of such microstructures is essential to develop new materials with desired properties (Aparecida Pinto et al, 2003). Laser parameters such as laser power density, interaction time and scan speed affect on solidification behaviour and thus the microstructure of melted zone can be changed.…”

Section: Laser Surface Remelting Of Aluminium Alloymentioning

confidence: 99%

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Laser Surface Treatments of Aluminum Alloys

Razavi¹,

Gordani²

2011

Recent Trends in Processing and Degradation of Aluminium Alloys

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“…The Ding et al article in this issue discusses aluminum alloys, including Al-40Ti-10Si, 34 Al-Si-10Mg, 35 , 36 and Al-15Cu. 37 Cobalt-based alloys include Co-29Cr-6Mo processed through SLM, 38 Co-26Cr-6Mo-0.2C processed through EBM, 39 and a range of alloys processed through laser cladding (DED as applied to coat other structures). 40 -44 Copper-based alloys processed include a special Cu-based alloy 45 and Cu-30Ni processed through direct metal deposition.…”

mentioning

confidence: 99%