Ag/Ti3AlC2 Composites Prepared by Equal Channel Angular Pressing Followed by Heat Treatment

doi:10.15541/jim20190242

Abstract

Abstract:

Equal channel angular pressing (ECAP) followed by heat treatment was carried out to prepare Ag/Ti₃AlC₂composites. Effects of heat treatment on the electrical resistivities and mechanical properties of the Ag/Ti₃AlC₂composites were investigated. Results show that ECAP effectively densifies the Ag/Ti₃AlC₂compacts, and layered Ti₃AlC₂ particles are delaminated and aligned due to shearing effect during ECAP. Alignment of Ti₃AlC₂ particles resulted in anisotropy of electrical and mechanical properties of the composites. Perpendicular to the alignment of Ti₃AlC₂ particles displayed high resistivity and compressive strength. Moreover, resistivity and compressive strength increased with following heat treatment, yielding the maximum at 800 ℃. These increments are attributed to the enhanced interfacial reactions between Ag and Ti₃AlC₂ at high temperatures. Findings in this study indicate that densification and microstructural control of Ag/MAX composites can be achieved simultaneously by ECAP, while the following heat treatment can tailor their properties.

Key words: equal channel angular pressing (ECAP), Ag/Ti₃AlC₂, alignment, heat treatment

CLC Number:

TB333

WANG Dan-Dan, TIAN Wu-Bian, DING Jian-Xiang, MA Ai-Bin, ZHANG Pei-Gen, HE Wei, SUN Zheng-Ming. Ag/Ti₃AlC₂ Composites Prepared by Equal Channel Angular Pressing Followed by Heat Treatment[J]. Journal of Inorganic Materials, 2020, 35(1): 46-52.

Figures/Tables 12

References 24

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Heat treatment	Loaded // alignment		Loaded ^ alignment
Heat treatment	σ_M/MPa	ε_M/%	σ_M/MPa	ε_M/%
N/A	287.5	23.9	336.9	29.2
600 ℃	366.1	28.9	400.0	29.8
800 ℃	519.2	37.9	784.0	52.8

Heat treatment	Loaded // alignment		Loaded ^ alignment
Heat treatment	σ_M/MPa	ε_M/%	σ_M/MPa	ε_M/%
N/A	287.5	23.9	336.9	29.2
600 ℃	366.1	28.9	400.0	29.8
800 ℃	519.2	37.9	784.0	52.8

Ag/MAX	Preparation method	Relative density/%	Resistivity/ (×10^-9, Ω·m)	Vickers hardness/HV	Maximum compressive strength and strain	Ref.
Ag/Ti₃AlC₂	ECAPed at 37 MPa +800 ℃, 2 h	(97.8±0.8)	(65.1±1)(//alignment) (78.5±1)(⊥alignment)	(79±5)	519 MPa, 37.9% (loaded // alignment) 784 MPa, 52.8% (loaded ^ alignment)	This work
Ag/Ti₃AlC₂	Compacted at 800 MPa+800 ℃, 2 h	(96.0±0.4)	(60.6±1)	(95±5)	(446±15) MPa, (32.9±2.8)%	[6]
Ag/Ti₃AlC₂	Compacted at 800 MPa+800 ℃, 2 h +ECAPed at 37 MPa	(99.8±0.2)	(59.3±1)(//alignment) (70.2±1)(⊥alignment)	(132±5)	(656±17) MPa, (30.3±2.7)% (loaded // alignment) (805±19) MPa, (43.8±2.2)% (loaded ^ alignment)	[6]
Ag/Ti₃SiC₂	Compacted at 800 MPa+950 ℃, 1 h	(95.0)	(27.6±0.2)	(56)	N/A	[7]
Ag/Ti₂AlC	Compacted at 800 MPa+800 ℃, 2 h	(95.7)	(79.5)	(88)	N/A	[10]
Ag/Ti₂SnC	Compacted at 800 MPa+800 ℃, 2 h	(95.0)	(118.3)	(75)	N/A	[9]

Ag/MAX	Preparation method	Relative density/%	Resistivity/ (×10^-9, Ω·m)	Vickers hardness/HV	Maximum compressive strength and strain	Ref.
Ag/Ti₃AlC₂	ECAPed at 37 MPa +800 ℃, 2 h	(97.8±0.8)	(65.1±1)(//alignment) (78.5±1)(⊥alignment)	(79±5)	519 MPa, 37.9% (loaded // alignment) 784 MPa, 52.8% (loaded ^ alignment)	This work
Ag/Ti₃AlC₂	Compacted at 800 MPa+800 ℃, 2 h	(96.0±0.4)	(60.6±1)	(95±5)	(446±15) MPa, (32.9±2.8)%	[6]
Ag/Ti₃AlC₂	Compacted at 800 MPa+800 ℃, 2 h +ECAPed at 37 MPa	(99.8±0.2)	(59.3±1)(//alignment) (70.2±1)(⊥alignment)	(132±5)	(656±17) MPa, (30.3±2.7)% (loaded // alignment) (805±19) MPa, (43.8±2.2)% (loaded ^ alignment)	[6]
Ag/Ti₃SiC₂	Compacted at 800 MPa+950 ℃, 1 h	(95.0)	(27.6±0.2)	(56)	N/A	[7]
Ag/Ti₂AlC	Compacted at 800 MPa+800 ℃, 2 h	(95.7)	(79.5)	(88)	N/A	[10]
Ag/Ti₂SnC	Compacted at 800 MPa+800 ℃, 2 h	(95.0)	(118.3)	(75)	N/A	[9]

Ag/Ti₃AlC₂ Composites Prepared by Equal Channel Angular Pressing Followed by Heat Treatment

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