9 documents found, page 1 of 1

Evaluating Mixing Methods in MMC Casting: Insights from PIV Analysis

Investigating various stirring and ultrasonic methods also addresses the practical challenges faced in scaling up metal matrix composites (MMC) production. Traditional stir casting methods, while beneficial, have limitations related to the uniformity of particle distribution and the tendency for particle agglomeration and porosity formation. Ultrasonic cavitation, on the other hand, has shown promise in enhanci...

Impact of the ultrasonic-assisted casting of an AlSi7Mg alloy on T6 heat treatment

In this work, the effect of ultrasonic vibration during solidification on the aging kinetics of an AlSi7Mg alloy is investigated. With the ultrasonic equipment coupled to the mold walls, melt treatment was performed by two approaches: (i) fully above liquidus (>635 ◦C); and (ii) in the full range between liquidus and solidus (630 ◦C→ 550 ◦C). Cast samples were then subjected to T6 heat treatment for different a...

The influence of precipitation hardening on the damping capacity in Al–Si–Mg ca...

An A356 alloy is a classic casting light alloy, which is able to be processed into complex geometrical shapes with tailored static and dynamic mechanical properties. As a promising material to reduce fuel and energy consumption in future vehicle designs, there is an interest in understanding the impact of heat treatments on the damping capacity of this alloy. The Granato–Lücke theory is used to detail the force...

The influence of precipitation hardening on the damping capacity in Al–Si–Mg ca...

An A356 alloy is a classic casting light alloy, which is able to be processed into complex geometrical shapes with tailored static and dynamic mechanical properties. As a promising material to reduce fuel and energy consumption in future vehicle designs, there is an interest in understanding the impact of heat treatments on the damping capacity of this alloy. The Granato–Lücke theory is used to detail the force...

Enhanced thermoelectric properties of Sb<inf>2</inf>Te<inf>3</inf> and Bi<inf>2...

Improved thermoelectric properties of p-Sb2Te3 and n-Bi2Te3 films deposited by thermal co-evaporation at 503 K and 543 K, respectively, are reported, by using two types of substrate (borosilicate glass and 25 μm - Kapton® polyimide). Seebeck coefficients of 194 μV K−1 and - 233 μV K−1 and electrical conductivities of 3.2 × 104 (Ω m)−1 and 5.0 × 104 (Ω m)−1, lead to optimized power factors of 1.2 × 10−3 W K−2 m−...

Ultrasonic assisted turning of Al alloys: influence of material processing to i...

Ultrasonic machining has been used over a decade to enhance the surface finishing and overall processing characteristics of conventional technologies. The benefits that are usually associated to this approach generate an increasing interest in both academic and industrial fields, especially in the turning operation due to its simple application. In this study, ultrasonic assisted turning is used to study the ef...

Bi2Te3 and Sb2Te3 Thin Films with Enhanced Thermoelectric Properties for Flexib...

The influence of substrate type in boosting thermoelectric properties of co-evaporated Bi2Te3 and Sb2Te3 films (with 400 nm-thick) is here reported. Optimized power factor values are 2.7 × 10⁻³ W K⁻² m⁻¹ and 1.4 × 10⁻³ W K⁻² m⁻¹ for flexible Bi2Te3 and Sb2Te3 films, respectively. This is an important result as it is at least 2 times higher than t...

Ponto de Situação dos trabalhos de minimização de impactes sobre o patrimó...

Ponto de Situação dos trabalhos de minimização de impactes sobre o patrimó...

O Bloco de Rega de Ervidel localiza-se nas freguesias de Aljustrel e Ervidel (concelho de Aljustrel), Ferreira do Alentejo (concelho de Ferreira do Alentejo), Santa Vitória e Mombeja (concelho de Beja). No âmbito dos trabalhos de minimização de impactes sobre o património cultural deste projeto, promovidos pela EDIA SA, foram realizadas várias intervenções em estações arqueológicas de diferentes peri...