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Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy

1
Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
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State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
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Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
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College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(7), 971; https://doi.org/10.3390/met10070971
Received: 15 June 2020 / Revised: 13 July 2020 / Accepted: 15 July 2020 / Published: 18 July 2020
A new sintering method, namely ultrasonic assisted sintering (UAS), has been proposed using mechanical heat converted from high frequency motion between particles. Pure aluminum specimens with diameter of 5 mm and thickness of ~2 mm have been successfully sintered in two seconds. Based on the thermodynamic analysis, the underlying heating mechanism is quantitatively interpreted, which involves high-frequency interparticle friction and plastic deformation driven by ultrasonic squeezing. Consequently, temperature rises rapidly at a speed of about 300 K/s, and the maximum temperature reaches up to 0.9 times of melting point of the aluminum during UAS. The sintered specimens have a high density of dislocations, under the combined effects of dislocations and undulating stress field, volume diffusion coefficient for sintering increases by several orders of magnitude, therefore, rapid densification can be accomplished in seconds. In addition, the sintered aluminum has ultrahigh nanohardness (~1.13 GPa), which can be attributed to the hierarchical structure formed during UAS process. View Full-Text
Keywords: ultrasonic assisted sintering; high-frequency friction; high-frequency plastic deformation; rapid densification ultrasonic assisted sintering; high-frequency friction; high-frequency plastic deformation; rapid densification
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MDPI and ACS Style

Liu, Z.; Ge, Y.; Zhao, D.; Lou, Y.; Liu, Y.; Wu, Y.; Yu, P.; Yu, C. Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy. Metals 2020, 10, 971. https://doi.org/10.3390/met10070971

AMA Style

Liu Z, Ge Y, Zhao D, Lou Y, Liu Y, Wu Y, Yu P, Yu C. Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy. Metals. 2020; 10(7):971. https://doi.org/10.3390/met10070971

Chicago/Turabian Style

Liu, Zhiyuan, Yang Ge, Dandan Zhao, Yan Lou, Yong Liu, Yuan Wu, Peng Yu, and Chunyan Yu. 2020. "Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy" Metals 10, no. 7: 971. https://doi.org/10.3390/met10070971

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