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

• Published in: Metals (Basel ) Vol. 11; no. 2; p. 218
• Main Authors: Yuan, Xianjie, Qu, Xuanhui, Yin, Haiqing, Feng, Zaiqiang, Tang, Mingqi, Yan, Zhenwei, Tan, Zhaojun
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.02.2021
• Subjects: Al-based alloy; Alloys; Aluminum base alloys; Densification; Density; Energy consumption; Heating rate; high-velocity compaction; Hot pressing; Mechanical properties; Microstructure; Powder metallurgy; Residual stress; Room temperature; Sintering; sintering process; Temperature; Tensile strength; Velocity; Germany
• ISSN: 2075-4701; 2075-4701
• DOI: 10.3390/met11020218

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.