Mechanical properties and fractography of zircon-particle-reinforced ZA-27 alloy composite materials

Sharma, S.C.; Girish, B.M.; Somashekar, D.R.; Kamath, Rathnakar; Satish, B.M.

doi:10.1016/s0266-3538(99)00040-8

Cited by 46 publications

(23 citation statements)

References 17 publications

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“…The sharp increase observed in the wear volume of the alloys in the initial period of the test run can be related to metal-to-metal contact which takes place due to insufficient oil film thickness between the rubbing surfaces, Figure 8. It is known that at the beginning of the test, metal-to-metal contact takes place due to insufficient oil film thickness and results in a high wear volume [6,20]. The oil film thickness increases with sliding distance and when it becomes sufficient to separate the contacting surfaces the friction coefficient drops to its minimum level and the wear volume becomes almost constant [2,6,12,20].…”

Section: Discussionmentioning

confidence: 99%

“…Formation of this layer was related to the back transfer of the wear particles from the cylinder surface to the sample surface [15]. Smearing of the wear particles on both surfaces can be taken as an indication of the adhesive wear [6,20]. In addition, zinc and aluminum oxide films form on the wear surfaces of these alloys and increase their wear resistance by facilitating sliding [2,20].…”

Section: Discussionmentioning

confidence: 99%

“…The wear tests were carried out at a contact pressure of 6.5 MPa, a sliding speed of 1.94 ms -1 and a constant oil flow rate of 1 cm 3 h À 1 for a sliding distance of 980 km. The test parameters were selected according to the working conditions of a crankshaft bearing of an automobile engine [2,6,14]. The worn surfaces of the alloy samples were examined with scanning electron microscope.…”

Section: Methodsmentioning

confidence: 99%

“…Studies have shown that some zinc-aluminum based alloys containing copper and/or silicon have superior mechanical and tribological properties compared to those of conventional bearing materials. These advantages can be stated as the high wear resistance, bet-49 50 ter embeddability, high damping characteristics and low cost [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Bican¹,

Savaşkan²

2020

Materialwissenschaft Werkst

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A ternary ZnAl40Cu2 and a quaternary ZnAl40Cu2Si2.5 alloys were produced by permanent mold casting and subjected to T5 heat treatment at a temperature of 150 °C for 24 hours. The structural, mechanical and lubricated wear properties of these alloys were investigated in the as‐cast and heat‐treated conditions and the results were compared with those of SAE 65 (CuSn12) plain bearing bronze. Microstructure of the ternary alloy consisted of aluminum‐rich α, eutectoid conversion product of α+η and ϵ phase located in the interdendritic channels. In addition to these phases, silicon particles were observed in the microstructure of the quaternary alloy. T5 heat treatment caused a considerable amount of reduction in the hardness, tensile strength and wear resistance of ZnAl40‐based ternary and quaternary alloys, but improved their ductility and stability. These alloys in the as‐cast and heat‐treated conditions exhibited lower wear volume or higher wear resistance than SAE 65 bearing bronze. Among the experimental alloys, the optimum mechanical properties and wear performance were obtained from ZnAl40Cu2Si2.5 alloy in both as‐cast and heat‐treated conditions. Adhesion appeared to be the main wear mechanism for the ZnAl40‐based alloys, but abrasion dominated the wear of SAE 65 bronze.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Bican¹,

Savaşkan²

2020

Materialwissenschaft Werkst

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“…Mehanička svojstva čestičnih ZA27/ZrSiO 4 kompozita (kompokasting) zavise od sadržaja ZrSiO 4 čestica, koje utiču na povećanje zatezne čvrstoće, modula elastičnosti i tvrdoće. Međutim, u prisustvu ovih čestica dolazi do značajnog smanjenja duktilnosti i žilavosti kompozita [79].…”

Section: U Poslednje Vreme I Kineski Istraživači (College Of Materialunclassified

Examination of the corrosion process impact on the microstructure and mechanical properties of Zn27Al1.5Cu0.02Mg alloy castings reinforced with silicon carbide particles

Bobić¹

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IZVODNa osnovu izvršenih istraživanja ustanovljeno je da postoji međusobna povezanost mikrostrukture, mehaničkih svojstava i korozionog ponašanja čestičnih ZA27/SiC kompozita. Livena ZA27 legura predstavlja metalnu osnovu za dobijanje kompozita. Struktura legure je tipična dendritna. Trajna transformacija dendritne u ne-dendritnu strukturu izvršena je tiksoformiranjem, dok je poluočvrsli rastop legure bio izložen dejstvu sila smicanja. Kompoziti su dobijeni kompokasting postupkom, uz infiltraciju 1, 3 i 5 mas.% SiC čestica u metalnu osnovu .. Otpornost prema koroziji matrične legure i ZA27/SiC kompozita određena je na osnovu vrednosti za brzinu korozije u rastvoru NaCl (pH=6,7). Određivanje brzine opšte korozije izvršeno je metodom gubitka mase i elektrohemijskim metodama. Otpornost matrične legure prema koroziji veća je od otpornosti kompozita. Uticaj korozije na mikrostrukturu ispitan je primenom svetlosne i skenirajuće elektronske mikroskopije. Posle izlaganja uzoraka u rastvoru NaCl, promena granice tečenja (pri ispitivanju pritiskivanjem), uzeta je kao pokazatelj uticaja korozije na mehanička svojstva matrične legure i kompozita. U matričnoj leguri procesi korozije zahvataju oblast η faze i oblast smeše faza α+η, a koroziona razaranja su površinskog karaktera. Zapaženo je da je u kompozitima sa većim sadržajem infiltriranih SiC čestica (3 i 5 mas.%) došlo do stvaranja nakupina SiC čestica, što je dovelo do obrazovanja mikroprslina i mikropora. Na ovim mestima proces korozije napreduje u dubinu materijala, što se negativno odrazilo na otpornost prema koroziji i mehanička svojstva čestičnih ZA27/SiC kompozita.Ključne reči: kompoziti sa metalnom osnovom, ZA27 legura, tiksoformiranje, kompokasting, opšta korozija, brzina korozije, gustina korozione struje, polarizaciona otpornost, mikrostruktura, granica tečenja pri ispitivanju pritiskivanjem. ABSTRACTOn the basis of examination carried out, the mutual dependence of the microstructure, mechanical properties and corrosion behaviour of particulate ZA27/SiC composites was established. As-cast ZA27 alloy was the metal matrix for producing composites. The structure of as-cast ZA27 alloy is typically dendritic. A permanent transformation of the dendritic structure into nondendritic one was achieved through thixoforming during exposure of ZA27 alloy semi-solid melt to the influence of shear forces. Composites were obtained by compocasting process, through infiltration of 1, 3 and 5 wt.% SiC particles into the metal matrix. Corrosion resistance of the metal matrix and ZA27/SiC composites was evaluated on the basis of corrosion rate in NaCl solution (pH=6.7). Mass loss method and electrochemical polarization measurements were used to determine rate of general corrosion. Matrix alloy resistance to corrosion is higher than the resistance of the composites. The influence of corrosion on the microstructure was examined using light and scanning electron microscopy. After exposure of samples in NaCl slution, compressive yield strength was taken as an indicator of corrosion i...

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Manufacturing and Characterization of Quicklime (CaO) Filled ZA‐27 Metal Alloy Composites for Single‐Row Deep Groove Ball Bearing

Patnaik

Bhat

Gangwar

2017

Handbook of Composites From Renewable Materials

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Mechanical properties and fractography of zircon-particle-reinforced ZA-27 alloy composite materials

Cited by 46 publications

References 17 publications

Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Examination of the corrosion process impact on the microstructure and mechanical properties of Zn27Al1.5Cu0.02Mg alloy castings reinforced with silicon carbide particles

Manufacturing and Characterization of Quicklime (CaO) Filled ZA‐27 Metal Alloy Composites for Single‐Row Deep Groove Ball Bearing

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