Wyniki wyszukiwania - Biblioteka Nauki

1

Fabrication, microstructure, and machinability of aluminum metal-matrix composites

100%

Kathiravan S. , Thanigaivelan R. , Suresh P.

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tom Vol. 40, No. 3

112--124

EN

Today, researchers across the world focus on sustainable products, and, accordingly, it is now imperative to develop sustainable MMCs. In line with this, ongoing experimental work aims to fabricate aluminum 6061 MMC with ground granulated blast furnace slag (GGBS) and study the micro-structural and machinability characteristics. A liquid state stir casting setup is used to melt aluminum 6061 alloy and reinforced with 2.5 wt.%, 5.0 wt.%, and 7.5 wt.% of GGBS. X-ray diffraction (XRD) studies were used to identify the chemical elements that were present in the fabricated samples. In order to observe the formation of any secondary elements, energy-dispersive X-ray spectroscopy and scanning electron microscopy (SEM) were utilized on the cast composites. Through the milling process, the influence of the GGBS reinforcement composition on the surface roughness (SR) and material removal rate (MRR) of aluminum 6061 MMC was examined, considering the parameters of spindle speed, feed rate, depth of cut, and reinforcement composition percentage. The L9 orthogonal array (OA) was used to investigate the results of the experiments, and the Taguchi technique was used to optimize the process. The best MRR value was produced by the feed rate (B3) of 260 mm3/min and the depth of cut (C3) of 0.75 mm. The study ascertained that the lower SR value is attained corresponding to a spindle speed of 1,250 rpm, a feed rate of 220 mm3/min, a depth of cut of 0.25 mm, and a reinforcement composition percentage of Al 6061 with 5% GGBS.

2

Applying stir casting method for Mg alloy-short carbon fiber composite processing

86%

Olszówka-Myalska A. , Myalski J.

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tom R. 14, nr 2

81--85

EN

The effects of applying the stir casting method to fabricate composites with an Mg-Zn-Zr-RE magnesium alloy matrix reinforced with short carbon fibers are presented in the article. The experimental procedure carried out in industrial conditions was described. Carbon material in the form of short staple fiber granules obtained from chopped/cut carbon roving was used. The procedure of suspension fabrication and casting in ceramic and steel moulds was described. The possibility of obtaining casts of different size and shape which can be a semi-product for die casting technology has been shown. Additionally, the microstructure and mechanical properties of the obtained material were characterized.

PL

W pracy przedstawiono efekty zastosowania metody mechanicznego mieszania komponentów i odlewania suspensji (stir casting) do otrzymywania kompozytów z osnową ze stopu magnezu Mg-Zn-Zr-RE umacnianych włóknami węglowymi krótkimi. Scharakteryzowano procedury procesu technologicznego prowadzonego w warunkach przemysłowych. Użyto materiału węglowego w postaci granul włókien krótkich ciętych otrzymanych z pociętego rovingu węglowego. Scharakteryzowano procedurę przygotowania suspensji i przebieg procesu jej odlewania do form ceramicznych i stalowych. Wykazano możliwość otrzymania wlewków kompozytowych o różnym kształcie i wielkości przeznaczonych do przetopu wtórnego i odlewania ciśnieniowego. Scharakteryzowano mikrostrukturę otrzymanego materiału i określono jego właściwości mechaniczne.

3

Investigating mechanical and physical properties of stir casted Al6061/nano Al2O3/quartz hybrid composite

72%

Tirfe D. , Woldeyohannes A. , Hunde B. , Batu T. , Geleta E.

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2023

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tom Vol. 40, nr 1

189--201

EN

Aluminum alloys are widely used in different engineering application areas, such as aerospace, automotive, and marine industries. However, their properties need some improvement in order to enlarge their application area. Thus, the objective of the study was to improve the physical and mechanical properties of Al6061 aluminum alloy by reinforcing it with nano-Al2O3 and micro-quartz particles. The investigation primarily was focused on studying the impact of quartz particles on the mechanical and physical properties of an Al6061/nano Al2O3/quartz hybrid composite. The hybrid composite was developed using a stir casting technique, by varying the weight percentage of quartz particles at 3%, 6%, and 9%, while maintaining a constant weight percentage of nano-Al2O3 at 3.5%. To evaluate the composite's properties, test samples were prepared according to ASTM E9-09 and ASTM E23 standards for hardness, compressive strength, creep, and impact energy absorption, respectively. The results of the investigation demonstrate that, with the addition of 9 wt.% of micro-quartz particles and 3.5 wt.% of nano-Al2O3 nanoparticles, all mechanical and physical properties of the matrix were improved, except for the impact strength. Based on these results, the developed hybrid composite material can be recommended for light weight automotive spare parts such as brakes and clutch discs.

PL

Stopy aluminium są szeroko stosowane w różnych obszarach zastosowań inżynieryjnych, takich jak przemysł lotniczy, motoryzacyjny i morski. Właściwości stopów aluminium wymagają udoskonaleń, aby zwiększyć zakres ich zastosowań. Celem badań była poprawa właściwości fizycznych i mechanicznych stopu aluminium Al6061 poprzez wzmocnienie nanocząstkami Al2O3 i cząstkami mikrokwarcu. Badania skupiały się przede wszystkim na badaniu wpływu cząstek kwarcu na właściwości mechaniczne i fizyczne kompozytu hybrydowego Al6061/nano Al2O3/kwarc. Kompozyt hybrydowy opracowano techniką odlewania z mieszaniem, zmieniając udział wagowy cząstek kwarcu na 3%, 6% i 9%, utrzymując natomiast stały udział wagowy nanocząstek Al2O3 (3,5%). Do oceny właściwości kompozytu, przygotowano próbki testowe zgodnie z normami ASTM E9-09 i ASTM E23 dotyczącymi odpowiednio twardości, wytrzymałości na ściskanie, pełzania i pochłaniania energii uderzenia. Wyniki badań wykazały, że dodatek 9% kwarcu i 3,5% nanocząstek Al2O3 spowodował poprawę wszystkich właściwości mechanicznych i fizycznych osnowy, z wyjątkiem udarności. Na podstawie uzyskanych wyników, opracowany hybrydowy materiał kompozytowy może być zalecany do lekkich części zamiennych do samochodów, takich jak tarcze hamulcowe i sprzęgła.

4

Fabrication of a high wear resistance AA7075/AL2O3 composites via liquid metallurgy process

72%

Sivaraman R. , Jalil A. T. , Aravindhan S. , Nan Z. , Vini M. H. , Daneshmand S.

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tom Vol. 27, no. 4

205--210

EN

In the present study, AA7075/Al2O3 composites have been fabricated via liquid metallurgy process. AA7075 alloy and Al2O3 particles were taken as the base matrix and reinforcements, respectively. Then, contents of 3 and 6 wt. % of Al2O3 subdivisions were added into the AA7075 matrix. To improve wettability and distribution, reinforcement particles were pre-heated to a temperature of 550°C for each composite sample. A hardened EN32 steel disc as the counter face was used to evaluate the wear rate pin-on-disc. The results showed that the wear rate of the AA/Al2O3 composites was smaller than that of the monolithic AA7075 samples. Finally, the worn surfaces of samples were investigated by SEM.

5

Experimental evaluation of Al-Zn-Al2O3 composite on piston analysis by CAE tools

58%

Krishnan B. R. , Ramesh M.

Mechanics and Mechanical Engineering

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2019

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tom Vol. 23, nr 1

212--217

EN

Today’s automotive designers and material specialists regard lighter vehicles for less fuel consumption (economy and ecology) and higher safety to passengers. Metal matrix composites have been a large area of interest. Aluminium composite is potentially applied in automotive and aerospace industries, because it has a superior strength to weight ratio and is a light weight metal with high temperature resistance. Composites containing hard oxides and ceramics (such as alumina) are preferred for high wear resistance along with increased hardness. In thiswork, alumina and zinc are reinforced in Al-LM25 alloy through stir casting process, where alumina is varied 6% and 12% in Al-5%Zn. Various mechanical analyses were conducted and the effect of wear with different percentage of alumina reinforcement was studied. The resulting properties are imported in a piston, modelled using solidworks, and analysed in ANSYS work bench. Imparting this new material for pistons could introduce deep design and improvements in engine operation of a vehicle.

6

Synthesis and characterization of AA5083 and AA2024 reinforced with SiO2 particles

58%

Raja R. , Jannet S. , Thampy M. A.

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