Effects of die-pressing pressure and extrusion on the microstructures and mechanical properties of SiC reinforced pure aluminum composites

Aluminum composites reinforced by graphene nanoplates(GNP) with a mass fraction of 0.5% (0.5 wt.% GNP/Al) were fabricated using cold pressing and hot pressing. An orthogonal test was used to optimize the fabrication parameters. Ball milling time, ball milling speed, and ultrasonic time have the largest influence on the uniformity of the graphene in the composites. Afterwards, the microstructure, interfacial properties, and fracture morphology of the composites obtained with different parameters were further analyzed. The results show that ball milling time and ball milling speed have obvious influences on the mechanical properties of the composite. In this paper, when the ball milling speed is 300 r/min and the ball milling time is 6 h, the dispersion uniformity of graphene in the 0.5 wt.% GNP/Al composite is the best, the agglomeration is the lowest, and the mechanical properties of the composites are the best, among which the tensile strength is 156.8 MPa, 56.6% higher than that of pure aluminum fabricated by the same process (100.1 MPa), and the elongation is 19.9%, 39.8% lower than that of pure aluminum (33.1%).

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Microstructures and mechanical properties of MgAl2O4 particle-reinforced AC4C aluminum composites

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(14)63354-9 ◽

2014 ◽

Vol 24 (7) ◽

pp. 2337-2345 ◽

Cited By ~ 6

Author(s):

Tateoki IIZUKA ◽

Qiu-bao OUYANG

Keyword(s):

Mechanical Properties ◽

Aluminum Composites ◽

Microstructures And Mechanical Properties

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Microstructures and Mechanical Properties of Fcc Pure Metals with Different Stacking Fault Energies by Equal Channel Angular Pressing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.682.193 ◽

2011 ◽

Vol 682 ◽

pp. 193-203 ◽

Cited By ~ 4

Author(s):

Yue Zhang ◽

Jin Qiang Liu ◽

Jing Tao Wang ◽

Zhi Bin Wu ◽

Fan Liu

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

Equal Channel Angular Pressing ◽

Pure Aluminum ◽

Pure Copper ◽

Pure Nickel ◽

Strain Level ◽

Angular Pressing ◽

Microstructures And Mechanical Properties ◽

Strain Increase

In the present work 99.98% commercial pure copper, 99.5% commercial pure nickel and 99.5% commercial pure aluminum were imposed on high strain levels of ~24, ~8 and ~44 by equal channel angular pressing (ECAP) via route Bc, respectively. Microstructures and mechanical properties are investigated by TEM observations, tensile tests and microhardness tests. It shows that grain sizes of pure copper, pure nickel and pure aluminum has been severed refined from several tens of microns into several hundreds of nanometers after ECAP processing, however, microstructure of copper are mainly consisted of equiaxed (sub) grains with illegible grains/ (sub) grains boundaries after processed by ECAP, while it is featured as lamellar boundaries in that of pure nickel and as elongated grains in that of pure aluminum underwent a same strain level of ECAP. Results of mechanical properties show that yield strength and microhardness increase as strain increase up to a max value in copper, and then begin to decrease slightly, while mechanical properties of the other two increase as strain increases in nickel up to a strain level of ~12, and as in aluminum, yield strength and microhardness increase as strain increase in a relative low strain level, and then reach an saturation value.

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