Effect of SiCp Particle Size Grading on the Microstructure and Properties of 55%SiCp/6061Al Composites

doi:10.12068/j.issn.1005-3026.2024.06.006

Abstract

Abstract:

55%SiCp/6061Al （55% is volume fraction） composites were prepared using the vacuum hot pressing method. The effects of SiCp particle size on distribution uniformity，density and bending strength of the composites were investigated. The results showed that composites with particle size grading have a dense microstructure，uniform SiCp distribution and high interfacial bonding strength between SiCp and the 6061Al alloy matrix. The bending strength of （60+25） μm composite with a mass ratio of 4∶1 raises from 395 MPa to 548 MPa. The bending strength of （120+60+25） μm composite with a mass ratio of 1∶1∶1 is the highest，reaching 397 MPa. The double grain size grading （106+25） μm composite with a mass ratio 4∶1 exhibits excellent comprehensive properties，with density>99.00%，uniformity>90.00% and bending strength>400 MPa after heat treatment.

Key words: 55%SiCp/6061Al composite, vacuum hot pressing, grain size grading, uniformity, density, bending strength

CLC Number:

TB 333

Meng-qi WANG, Yue LIU, Chun-lin XIAO, Chun-ming LIU. Effect of SiCp Particle Size Grading on the Microstructure and Properties of 55%SiCp/6061Al Composites[J]. Journal of Northeastern University(Natural Science), 2024, 45(6): 802-807.

Figures/Tables 8

Table 1 The main chemical composition of 6061Al（mass fraction）

Mg	Si	Cu	Cr	Fe	Mn	Zn	Ti	Al
0.8~1.2	0.4~0.8	0.15~0.4	0.04~0.35	≤0.7	≤0.15	≤0.25	≤0.15	余量

Table 2 SiCp particle size ratio and mass ratio of 55% SiCp / 6061Al composites

试样序号	粒径级配/μm	粒径比	质量比
1（双粒径）	（60+25）	2.4∶1	4∶1
2（双粒径）	(100+25）	4∶1	4∶1
3（三粒径）	(120+60+25）	4.8∶2.4∶1	1∶1∶1
4（三粒径）	（100+60+40）	2.5∶1.5∶1	3∶2∶1

Fig.1 Relationship between bulk density and particle size composition of SiCp[14-16]

Fig.2 Density of 55%SiCp/6061Al composites

Fig.3 Microstructure of SiCp/6061Al composites with particle size grading

Fig.4 Distribution uniformity of SiCp in 6061Al matrix

Fig.5 Bending strength of 55%SiCp/6061Al composites

Fig.6 Fracture morphology of 55%SiCp/6061Al composites with particle size grading

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