The focus of the paper is the wear behavior of hybrid aluminum metal matrix composites. The main objective of the investigation is to conduct the wear test at room temperature for both the as-cast and age hardening conditions. Materials chosen for the study are Aluminum 7075 as a matrix, Silicon Carbide and Alumina are the reinforcements. Hybrid metal matrix composites are produced by utilizing stir casting route for 5-15 wt.% silicon carbide and alumina. Microstructural characterization of hybrid aluminum metal matrix composites reveals the homogeneous mixing of reinforcements. It is noticed that the higher composite hardness is obtained due to the raise in weight percentage of the reinforcement up to 10% of hybrid reinforcements. In the T6 heat treatment, there is a gain in hardness by 24 % for optimum percentage of reinforcement i.e. 10 % compare with as-cast composites.

Saliva plays a vital role in oral health as patients strive to maintain a healthy dentition throughout their lives. It is nature's primary defense mechanism for the oral environment, and is particularly important for protecting exposed tooth surfaces. While internal protection for dentin comes from odontoblasts and the dental pulp, the body's external protection for enamel comes from saliva.The noninvasive nature of salivary testing has made it an effective alternative to blood and urine testing and home testing kits have made it possible for people to monitor their own health using this diagnostic medium. This paper presents what saliva can reveal about general and oral health as well as highlights the current use and potential clinical and research applications, of diagnostics based on oral fluids.Clinical significance: Early detection always minimizes the need for more invasive treatment. It prevents oral health disease at an early stage and provides a good oral health in rejuvenated state. If you stick and follow regular professional care, prevention maintenance appointments, prevention counseling, good home care and oral hygiene, diet habits you will be free from oral health illness and you can experience the harmonious and rejuvenated state of good oral health.

In the present investigations, dry sliding wear test is conducted using a pin on disc tribometer at room temperature for both the as-cast and age hardening conditions. Al7075 has chosen as the matrix material. The reinforcement used are particles of silicon carbide and alumina with 5 wt%, 10 wt%, and 15 wt%. Hybrid aluminum metal matrix composites are produced utilizing stir casting route for enhancing the wear behavior. In the aluminum matrix, micro-structural characterization reveals the homogeneous mixing of reinforcements. From the investigation, it is observed that composites containing 10% by weight of silicon carbide and aluminum oxide reinforcements with ageing exhibited superior tribological properties. From the micro-structural study, it has been observed that the generation of the mechanically mixed layer in the hybrid aluminum metal matrix composites will lead to a reduction in wear rate.

Aluminium alloys are most suitable for light weight applications. This research paper investigates the fatigue strength of Aluminium alloy 2024-T3 after shot peeing process using nickel shots. Nickel shots are used in this research to investigate the influence of nickel on the fatigue strength of aluminum 2024-T3 alloy. Compressed air is used for shot peening process. Shot peening process parameter values are chosen based on response surface method (RSM) to conduct the experiments. Desirability approach is used to get the optimized values of process parameters. High cycle fatigue testing is performed to find the fatigue strength of specimens before and after shot peening process. An increase in the fatigue strength up to 34% is observed after peening using the nickel shots. FESEM and EDS tests revealed the presence of nickel on the surface of aluminium 2024-T3 specimen after shot penning with nickel shots.

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