Preparation and Characterization of AlMgB14-TiB2 Composite by Field-activated and Pressure-assisted Synthesis

doi:10.3724/SP.J.1077.2013.12300

Abstract

Abstract:

The pre-reacted AlMgB₁₄ powders prepared by FAPAS were mixed with TiB₂ powers and then subjected to the temperature of 1500℃, the axial pressure of 60 MPa, the heating rate of 100℃/min and dwelling time of 15 min. AlMgB₁₄-30wt% TiB₂composites with ideal structures were successfully prepared. The microstructure and components of synthesized composites were observed and determined by scanning electron microscope (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and transmission electron microscope (TEM). The results show that the micro-hardness of the AlMgB₁₄-30wt% TiB₂ composites is 31.5 GPa and the fracture toughness K_1C could reach 3.65 MPa·m^1/2, which is consistent with those prepared by mechanical alloying/hot pressing. The microstructure analysis shows that the main toughening mechanisms of AlMgB₁₄-TiB₂composites are due to the hard phase dispersion strengthening, high-strength interface bonding. The FAPAS method might be used to synthesize AlMgB₁₄-TiB₂composites at low costs with fast heating-up and efficiency.

Key words: field-activated and pressure-assisted synthesis((FAPAS), AlMgB₁₄, AlMgB₁₄-TiB₂composites, microstructure, mechanical properties

CLC Number:

TB321

LIU Wen, MIAO Yang, CHEN Shao-Ping, ZHUANG Lei, MENG Qing-Sen. Preparation and Characterization of AlMgB₁₄-TiB₂Composite by Field-activated and Pressure-assisted Synthesis[J]. Journal of Inorganic Materials, 2013, 28(4): 369-374.

Figures/Tables 9

References 17

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Experimental steps	The pre-reacted starting powder with composition	Process parameters
1	Al:Mg:B=1:1:14+CS+3wt%Al ^[13]	Temperature 1400℃, pressing force 20 MPa, heating rate 100 ℃/min, soak time 10 min
2	AlMgB₁₄+30wt%TiB₂	Temperature 1500℃, pressing force 60 MPa, heating rate 100 ℃/min, soak time 15 min

Experimental steps	The pre-reacted starting powder with composition	Process parameters
1	Al:Mg:B=1:1:14+CS+3wt%Al ^[13]	Temperature 1400℃, pressing force 20 MPa, heating rate 100 ℃/min, soak time 10 min
2	AlMgB₁₄+30wt%TiB₂	Temperature 1500℃, pressing force 60 MPa, heating rate 100 ℃/min, soak time 15 min

Regions	Element	wt%	at%
A	B	63.34	80.34
	Mg	18.31	10.33
	Al	18.35	9.33
B	B	4.82	18.33
B	Ti	95.18	81.67
C	O	41.92	54.07
	Mg	18.07	15.34
	Al	40.01	30.60

Regions	Element	wt%	at%
A	B	63.34	80.34
	Mg	18.31	10.33
	Al	18.35	9.33
B	B	4.82	18.33
B	Ti	95.18	81.67
C	O	41.92	54.07
	Mg	18.07	15.34
	Al	40.01	30.60

Sample	Vickers hardness /GPa	Fracture toughness K_IC/(MPa·m^½)
AlMgB₁₄	27.2	3.00
AlMgB₁₄-30wt%TiB₂	31.5	3.65

Preparation and Characterization of AlMgB₁₄-TiB₂Composite by Field-activated and Pressure-assisted Synthesis

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Preparation methods	Phase composition	Structure	Hardness Vicker/GPa	Fracture toughness K_IC/(MPa·m^½)	Process parameters
FAPAS	AlMgB₁₄ ,TiB₂, MgAl₂O₄(impurity)	In the form of individual (TiB₂) grains in the size range of 2-5 µm and larger aggregates with an average grain size of about 10 µm	31.5	3.65	1500℃, 60 MPa, 15 min
Hot pressing^[13]	AlMgB₁₄, TiB₂, MgAl₂O₄(impurity) FeB₄O₇(impurity)	In the form of individual (TiB₂) grains in the size range of 1-3 µm and larger aggregates with an average grain size of about≤5 µm	31-35	3.7±0.2	1600℃, 75 MPa, 1 h

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