Effect of powder microstructure on the thermal and mechanical properties of hot extruded Al-CNT composite

Ding，Chao; Yu，Kaiping; Nodooshan，Hamid Reza Jafari; Ye，Shulong; Yu，Peng

2022-01-25

10.1016/j.jallcom.2021.162059

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

To understand the effects of microstructure of powders on resultant thermal and mechanical properties of Al-CNT composite, spherical and flake Al-CNT powders are fabricated by chemical vapor deposition and ball milling. Results showed that the spherical composite powder and its extruded sample feature with coarse grains and integrated CNTs, which imparts excellent thermal conductivity, the maximum of 246.6 W m K (400 ℃) are obtained. However, CNTs are found agglomerating in the grain boundaries of the Al matrix, leading to poor interfacial bonding and deteriorated mechanical properties. Compared to the spherical powders, the ball-milled flake Al-CNT powders have much finer grain structures, as well as more uniformly distributed CNTs which bond better with the Al matrix. After extrusion, their ultimate strengths are significantly improved and CTEs are further reduced, the maximum ultimate strengths of 186.2 MPa and minimum CTEs of 25 × 10 K (400 ℃) are achieved. Nevertheless, the CNTs tend to be broken in the ball milling which unfortunately damages the thermal conductivity.

Al-CNT composite Mechanical properties Microstructure Thermal properties

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Committee[KQJSCX20180322152424539] ; China Postdoctoral Science Foundation[2021M691401]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000706936200002

ELSEVIER SCIENCE SA

20214010971129

Ball milling ; Chemical bonds ; Chemical vapor deposition ; Grain boundaries ; Milling (machining) ; Powders ; Spheres ; Thermal conductivity

Machining Operations:604.2 ; Thermodynamics:641.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85115957195

Scopus

Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Ding，Chao,Yu，Kaiping,Nodooshan，Hamid Reza Jafari,et al. Effect of powder microstructure on the thermal and mechanical properties of hot extruded Al-CNT composite[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,891.

Ding，Chao,Yu，Kaiping,Nodooshan，Hamid Reza Jafari,Ye，Shulong,&Yu，Peng.(2022).Effect of powder microstructure on the thermal and mechanical properties of hot extruded Al-CNT composite.JOURNAL OF ALLOYS AND COMPOUNDS,891.

Ding，Chao,et al."Effect of powder microstructure on the thermal and mechanical properties of hot extruded Al-CNT composite".JOURNAL OF ALLOYS AND COMPOUNDS 891(2022).