Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy
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 thermo...
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MDPI AG
2020-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/7/971 |
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| author | Zhiyuan Liu Yang Ge Dandan Zhao Yan Lou Yong Liu Yuan Wu Peng Yu Chunyan Yu |
| author_facet | Zhiyuan Liu Yang Ge Dandan Zhao Yan Lou Yong Liu Yuan Wu Peng Yu Chunyan Yu |
| author_sort | Zhiyuan Liu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T18:23:50Z |
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| id | doaj.art-888762172e4b4281803f2443a55bb1d8 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T18:23:50Z |
| publishDate | 2020-07-01 |
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| series | Metals |
| spelling | doaj.art-888762172e4b4281803f2443a55bb1d82023-11-20T07:11:06ZengMDPI AGMetals2075-47012020-07-0110797110.3390/met10070971Ultrasonic Assisted Sintering Using Heat Converted from Mechanical EnergyZhiyuan Liu0Yang Ge1Dandan Zhao2Yan Lou3Yong Liu4Yuan Wu5Peng Yu6Chunyan Yu7Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, ChinaGuangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, ChinaGuangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, ChinaGuangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaBeijing Advanced Innovation Center for Materials Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaA 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.https://www.mdpi.com/2075-4701/10/7/971ultrasonic assisted sinteringhigh-frequency frictionhigh-frequency plastic deformationrapid densification |
| spellingShingle | Zhiyuan Liu Yang Ge Dandan Zhao Yan Lou Yong Liu Yuan Wu Peng Yu Chunyan Yu Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy Metals ultrasonic assisted sintering high-frequency friction high-frequency plastic deformation rapid densification |
| title | Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy |
| title_full | Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy |
| title_fullStr | Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy |
| title_full_unstemmed | Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy |
| title_short | Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy |
| title_sort | ultrasonic assisted sintering using heat converted from mechanical energy |
| topic | ultrasonic assisted sintering high-frequency friction high-frequency plastic deformation rapid densification |
| url | https://www.mdpi.com/2075-4701/10/7/971 |
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