EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF EXTRUDED SiC/6061 COMPOSITE

Glogovský, Miroslav; Fujda, Martin; Vojtko, Marek; Zubko, Pavol; Škrobian, Milan

doi:10.12776/ams.v21i1.547

Cited by 8 publications

(5 citation statements)

References 20 publications

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“…6061 aluminum alloy matrix composites, with broad application prospects in the fields of automobile, aerospace, shipping, etc., have been highlighted recently due to the high thermal conductivity, low density, and good processing performance of the 6061 aluminum alloy. On the other hand, SiC particles are suitable as reinforcement due to their high hardness, high strength, and excellent wear resistance [1,2,3,4,5,6,7]. Many scholars have studied the reinforcement of SiC on aluminum alloy matrix composites, but few papers have studied the mechanical properties of SiC p /6061Al composites with a large range of SiC mass fractions, especially connecting this with heat treatment and different tensile temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of T6 Treatment, Tensile Temperature, and Mass Fraction of SiC on the Mechanical Properties of SiCp/6061Al Composites

Guo

et al. 2019

Materials

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SiCp/6061Al composites have been developed and widely applied in many fields, such as automobile, aerospace, shipping, and so on. Considering heat treatment, service environment, and strength of composites, this paper comprehensively studies the mechanical properties of SiCp/6061Al composites with a large range of SiC mass fractions under T6 treatments and different tensile temperatures. SiCp/6061Al composites were successfully prepared by hot press sintering at various SiC mass fractions (0–30%), and the influences of SiC concentration and T6 treatment on the mechanical properties of composites were characterized via tensile tests at room temperature, 100, and 200 °C. Microstructure and fracture surfaces of composites with various SiC concentrations were further analyzed by optical microscope and SEM. The formula for the biggest critical reinforcement concentration for the saturated distribution of SiC is proposed to reveal the strengthening rule of different SiC concentrations. Results show that the effect of T6 treatment on the mechanical properties of composites is a marked increase in tensile strength and an obvious decrease in elongation. The increase in the SiC mass fraction, except at 30%, is able to bring an increase in tensile strength and a decrease in elongation, and the change of the elongation is insignification in T6-treated specimens. The tensile strength of T6-treated specimens decreases as temperature increases, and the composite has a maximum elongation at 100 °C.

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Section: Introductionmentioning

confidence: 99%

Effects of T6 Treatment, Tensile Temperature, and Mass Fraction of SiC on the Mechanical Properties of SiCp/6061Al Composites

Guo

et al. 2019

Materials

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“…Many of experiments have described several additive (alloying) elements such as Ni, Cr, Mg, Mn, Zn, which significantly contribute to improving the mechanical properties, both at normal and elevated temperatures, corrosion resistance, etc. [4][5][6][7][8][9]. The second group of elements, which, on the contrary, harm the properties of Al-Si alloys are so-called admixtures.…”

Section: Introductionmentioning

confidence: 99%

Fractographic Analysis of Castings from Al-Si Alloy Produced by Low-Pressure Casting

Svobodová

Michna

Hren

2020

MSF

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The article deals with the use of newly developed hypoeutectic silumin type AlSi9NiCuMg0.5 in manufacturing practice. This type of silumin has been produced and patented by a team of workers at the Faculty of Mechanical Engineering at the University of J. E. Purkyně in Ústí nad Labem, Czech Republic. This alloy was developed and tested directly for the technical practice where the special mechanical and technological properties of the alloy were required [1]. The experiment, which is presented in this paper, focuses on the cause of the castings cracking in operating conditions. When the material was put into practice, castings were produced and subsequently used for breaking and cracking across the entire casting section. AlSi9NiCuMg0.5 alloy castings were manufactured using low-pressure technology. The research is focused on the observation of the fracture surface, identification of microstructure of AlSi9NiCuMg0.5 alloy casting and determination of the chemical composition of structural components on the surface of fracture by EDS analysis. Fractional field research has measured the chemical composition and it has been compared with the required declared alloy. Increased iron content and associated intermetallic phases were identified in the alloy. Evaluating of the obtained results can identify the cause of the premature cracking of the castings made from the newly developed hypoeutectic silumin.

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“…This phase has hexagonal structure with a = 0.705 nm and c = 0.405 nm [17,18] • β is the equilibrium phase, which is in the form of small plates with thicknesses of about ten nm and a few hundred nm of size. This phase has a face-centered cubic (FCC) CaF2 structure with a = 0.639 nm [19] The 6xxx series aluminum alloys have low addition elements and are easy to form into extrusions such as: forgings and other shaped products and then to obtain their highest mechanical properties during heat treatment and ageing [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Belghit¹,

Farh²,

Ziar³

et al. 2018

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The scope of this work is to investigate the precipitation of two Al-Mg-Si alloys with and without Cu and excess Si by using the differential scanning calorimetry (DSC), transmission electron microscopic (TEM), Vickers hardness measurement and X-ray diffraction. The analysis of the DSC curves found that the excess Si accelerate the precipitation and the alloy contain the excess Si and small addition of copper has higher aging-hardness than that of free alloy (without excess Si and Cu) at the same heat treatment condition. The sufficient holding time for the precipitation of the β'' phase was estimated to be 6 hours for the alloy aged at 100°C and 10 hours for the alloy aged at 180°C. The low Copper containing Al-Mg-Si alloy gives rise to the forming a finer distribution of β (Mg 2 Si) precipitates which increases the hardness of the alloy. In order to know more about the precipitation reactions, concern the peaks on the DSC curve transmission electron microscopy observation were made on samples annealed at temperatures (250°C, 290°C and 400°C) just above the corresponding peaks of the three phases β'', β' and β respectively.

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EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF EXTRUDED SiC/6061 COMPOSITE

Cited by 8 publications

References 20 publications

Effects of T6 Treatment, Tensile Temperature, and Mass Fraction of SiC on the Mechanical Properties of SiCp/6061Al Composites

Effects of T6 Treatment, Tensile Temperature, and Mass Fraction of SiC on the Mechanical Properties of SiCp/6061Al Composites

Fractographic Analysis of Castings from Al-Si Alloy Produced by Low-Pressure Casting

Archives of Metallurgy and Materials

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