Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Abstract

This present work investigates the effects of sintering temperature on densification, mechanical properties and microstructure of Al-based alloy pressed by high-velocity compaction. The green samples were heated under the flow of high pure (99.99 wt%) N2. The heating rate was 4 °C/min before 315 °C. For reducing the residual stress, the samples were isothermally held for one h. Then, the specimens were respectively heated at the rate of 10 °C/min to the temperature between 540 °C and 700 °C, held for one h, and then furnace-cooled to the room temperature. Results indicate that when the sintered temperature was 640 °C, both the sintered density and mechanical properties was optimum. Differential Scanning Calorimetry, X-ray diffraction of sintered samples, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, and Transmission Electron Microscope were used to analyse the microstructure and phases.

Mechanical and thermal behaviors of Ti36-Al16-V16-Fe16-Cr16 high entropy alloys fabricated by spark plasma sintering: An advanced material for high temperature/strength applications

“…The high densification at higher temperature is attributed to higher metallurgical bonding, higher diffusion coefficient at the optimum sintering temperature. 35…”

“…High porosity was caused by poor densification which was induced by inadequate SPS sintering temperature that led to weak metallurgical bonding. 35…”

“…Sample sintered at the optimum temperature had superior creep and stiffness because material with higher hardness and modulus tend to resist creep more than that with lower hardness since these properties are dependent on the bonding energy, compaction rate, rate of particle migration and thermodynamic stability attained during sintering. 35,45 More so, the stiffness was highest on the sample sintered at 1000°C and lowest on the sample sintered at 700°C. Of course stiffness which is the ability to resist bending should tow the same route with hardness of the material.…”

“…The high densification at higher temperature is attributed to higher metallurgical bonding, higher diffusion coefficient at the optimum sintering temperature. 35 So, at lower sintering temperature, neck formation on the atoms was low; so there were low contact areas between adjacent atoms, and it is through the neck that micro diffusion of particles which facilitates full densification takes place. The maximum densification and minimum porosity were obtained at sintering temperature of 1000°C and 1100°C as reported elsewhere.…”

Evaluation of the Interface of Green Bilayer Powder Compact (BPC) of Iron (Fe) Under Different Die Wall Conditions

“…Thus, any additional machining works are not necessary. Enhancement of the strength of green SPC was proposed by notable investigations and practically implemented by industries such as green machining technique (Kulkarni & Dabhade, 2019) and high-velocity compaction (HVC) (Yuan et al, 2021). Instantly, the use of the PM compaction route is widely contributing to various circles of industries, for instance, automobile (Masooth et al, 2022), composites (Arifin et al, 2022), military products (Santos et al, 2018) and healthcare (Elsayed et al, 2022) industries.…”