Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy

Liu, Zhiyuan1; Ge, Yang1; Zhao, Dandan1; Lou, Yan1; Liu, Yong2; Wu, Yuan3; Yu, Peng4; Yu, Chunyan5

2020-07

10.3390/met10070971

Metals   影响因子和分区

2075-4701

2075-4701

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 similar to 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 (similar to 1.13 GPa), which can be attributed to the hierarchical structure formed during UAS process.

ultrasonic assisted sintering high-frequency friction high-frequency plastic deformation rapid densification

SCI

英语

其他

National Natural Science Foundation of China[51971149][51701125] ; Science and Technology Innovation Commission of Shenzhen[KQJSCX20180328095612712]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000557736000001

MDPI

Web of Science

1.Shenzhen Univ, Guangdong Prov Key Lab Micronano Optomechatron En, Coll Mechatron & Control Engn, Shenzhen 518060, Guangdong, Peoples R China
2.Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
3.Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
4.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
5.Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Guangdong, Peoples R China

Liu, Zhiyuan,Ge, Yang,Zhao, Dandan,et al. Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy[J]. Metals,2020,10(7).

Liu, Zhiyuan.,Ge, Yang.,Zhao, Dandan.,Lou, Yan.,Liu, Yong.,...&Yu, Chunyan.(2020).Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy.Metals,10(7).

Liu, Zhiyuan,et al."Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy".Metals 10.7(2020).