Effects of Heat-treatment Temperature on Properties of Co-continuous β-Si3N4 Reinforced Al Matrix Composites

doi:10.15541/jim20140473

Abstract

Abstract:

The co-continuous β-Si₃N₄ reinforced Al matrix composites were fabricated through squeeze casting of porous β-Si₃N₄ preforms with porosity of 53.43% which obtained by pressureless sintering. The influences of heat-treatment temperature on the microstructures and mechanical properties of co-continuous β-Si₃N₄ reinforced Al matrix composites were investigated. With the heat-treatment temperature increase, the degree of interfacial reaction, dislocation density increase, and vickers hardness increases, while fracture toughness decreases, accompanied by flexural strength increasing until 850℃ and then decreasing. The fracture mode of composites changes gradually from ductile intergranular rupture to brittle intergranular rupture. When being heat-treated at 850℃, the composites obtain the optimum mechanical properties with the reaction layer of about 20-50 nm.

Key words: squeeze casting, composites, interfacial reaction, dislocation multiplication

CLC Number:

TB331

LU Yuan, LI Jing-Long, YANG Jian-Feng, LI Peng. Effects of Heat-treatment Temperature on Properties of Co-continuous β-Si₃N₄ Reinforced Al Matrix Composites[J]. Journal of Inorganic Materials, 2015, 30(3): 277-281.

Figures/Tables 8

Table 1 Composition and sintering properties of the porous β-Si3N4 preforms

Samples	Composition/ wt%		Sintering property
Samples	α-Si₃N₄	Y₂O₃	Weight loss/%	Linear shrinkage/%	Porosity/%	Flexural strength /MPa
Porous β-Si₃N₄preform	95	5	8.7%	4.3%	53.4%	152.3

Fig. 1 Fracture morphology of the porous β-Si3N4 preform

Fig. 2 XRD patterns of the composites after heat-treatment at different temperatures (a) (1) 750℃, (2) 800℃; (b) (3) 850℃, (4) 900℃, (5) 950℃

Fig. 3 Fracture morphologies of the composites after heat-treatment at (a) 750℃, (b) 850℃ and (c) 950℃

Table 2 Mechanical properties of the composites after heat-treatment at different temperatures

Samples	Vickers hardness/HV	Flexural strength /MPa	Fracture toughness/(MPa·m^1/2)
Untreated	450.76	441.90	6.95
750℃	492.15	467.56	5.58
800℃	616.87	523.17	4.72
850℃	753.21	658.91	3.61
900℃	1105.99	489.05	1.88
950℃	1287.91	395.62	1.42

Fig. 4 TEM image of the composite after heat-treatment at 850℃

Fig. 5 TEM (a) and HRTEM (b) images of reaction layer of the composite after heat-treatment at 850℃

Fig. 6 EDS analysis for reaction layer in SEM observation area of the composite after heat-treatment at 850℃

References 16

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Effects of Heat-treatment Temperature on Properties of Co-continuous β-Si₃N₄ Reinforced Al Matrix Composites

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