Tribo-Mechanical Behaviour of Ti-Based Particulate Reinforced As-Cast and Heat Treated A359 Composites
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ORIGINAL PAPER
Tribo-Mechanical Behaviour of Ti-Based Particulate Reinforced As-Cast and Heat Treated A359 Composites N. Radhika 1
&
J. Sasikumar 1 & J. Arulmozhivarman 1
Received: 14 August 2019 / Accepted: 25 December 2019 # Springer Nature B.V. 2020
Abstract This study investigates the tribo-mechanical behaviour of as-cast and heat treated A359/ 6 wt.% Ti-based particulate reinforced homogeneous composites (TiB2, TiO2, and TiC) processed through modified stir casting technique. Metallographical observation on as-cast homogeneous composites revealed a uniform distribution of reinforcements throughout the cross-section. In heat treated composites, the tribo-mechanical properties were enhanced by the formation of spheroidized alpha eutectic Si. TiB2 and TiO2 exhibited superior interfacial bonding with Al-matrix, whereas TiC showed marginal wetting. Linear reciprocating wear experiments were performed on all as-cast and heat treated components by varying loads (15–55 N) and sliding distances (500– 2500 m). Results revealed superior hardness (182.5 HV), tensile strength (271.6 MPa) and wear resistance for heat treated A359/TiB2 composite than TiO2 and TiC reinforced composites. The wear rate and coefficient of friction was observed to be dependent on the applied load and type of reinforcement particle in the composites. Worn surfaces of composites exhibited severe delamination wear mechanism. Keywords Homogeneous composites . Spheroidization . Heat treatment . Reciprocating wear . Delamination
1 Introduction Aluminium silicon (Al-Si) alloys have outstanding mechanical properties along with dimensional stability and good corrosion resistance. However, these alloys have poor resistance to wear. To enhance the wear resistance along with tailored properties, researchers have productively embedded numerous hard ceramic and soft natural reinforcements such as Tungsten Carbide (WC), fly ash, Titanium Carbide (TiC), Boron Carbide (B4C), Alumina (Al2O3), Silicon Carbide (SiC), coconut char, graphite and so on, into Al-Si alloys using various manufacturing techniques [1]. Owing to its numerous advantages, liquid metallurgy route was considered best
* N. Radhika [email protected] J. Sasikumar [email protected] J. Arulmozhivarman [email protected] 1
Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India
among other processing routes, such as solid state processing (powder metallurgy technique, high energy ball milling, diffusion bonding, ultrasonic probe assisted method) and deposition processing (vapour deposition, spray deposition and laser deposition) [2]. Currently, Aluminium Metal Matrix Composites (AMMCs) are considered as an advanced engineering material in automobile industries due to its tailored mechanical, corrosion and tribological properties [3]. The mechanical properties of AMMCs depend on the particle size of the reinforcements and its distribution for interfacial bonding characteristics [4]. A significant rise in porosi
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