Wear behavior of Al-Si alloy based metal matrix composite reinforced with TiB2

National Conference on Processing and Characterization of Materials

Sahoo, J.K.^1 ; Sahoo, S.K.^1 ; Sutar, H.^2 ; Sarangi, B.^1

Department of Metallurgical and Materials Engineering, Indira Gandhi Institute of Technology, Sarang, Dhenkanal

ODISHA

759146, India^1

Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, Dhenkanal

ODISHA

759146, India^2

关键词: Dry sliding wear;    In-situ composite;    Operating condition;    Sliding distances;    Specific wear rates;    Stir casting method;    Strength to weight ratio;    Structural applications;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/178/1/012025/pdf
DOI  :  10.1088/1757-899X/178/1/012025

来源: IOP

【 摘 要 】

Al-Si alloy based composites are widely used in automotive, aerospace and for structural application due to improved strength to weight ratio, low density, and better wear resistance. In the present work, Al-xSi-5TiB2 (x=7, 11, 12.6) in-situ composite was synthesized successfully by stir casting method. Here the composites were prepared by the exothermic reaction of K2TiF6and KBF4salts with the molten Al-x Si alloy. The dry sliding wear behavior of Al-Si matrix composites reinforced with 5 % TiB2was studied using a pin-on-disc wear testing machine to study the effect of % Si, load (10, 20, 30 N), sliding speed (1.36, 1.82, 2.27 m.s-1) and sliding distance on stir cast Al-xSi-5TiB2composites. The Al-Si alloy and the reinforcement mixers were confirmed by the X-ray Diffraction analysis. The microstructure of Al-xSi-5TiB2composite was investigated by using Optical Microscope to determine the phases present in the prepared composites. The prepared AMC composites were tested for hardness using Vickers Hardness tester with the variation of Si. Wear rate (mm3/m), Wear resistance (m/mm3), Specific Wear rate (m3/N.m) and were analyzed with various conditions. The worn surfaces of the specimens were analyzed before and after wear testing by Scanning Electron Microscope (SEM) to determine the governing wear mechanisms in the composites. Wear rate and specific wear rate decreases at all the operating condition with increase in wt% Si. Wear resistance all most increases with increase in wt% Si. Hardness values are increased with increase in amount of Si.