Comparisons of Microstructures and Mechanical Properties of Heterogeneous Nano-Structure Induced by Heavy Cold Rolling and Ultrafine-Grained Structure by Multi-Directional Forging of Cu–Al Alloy

Highest strength for 7075 Al alloy was obtained by combining the equal-channel-angular pressing (ECAP) and natural aging processes. The tensile yield strength and ultimate strength of the ECAP processed and naturally aged sample were 103% and 35% higher, respectively, than those of the coarse-grained 7075 Al alloy counterpart. The enhanced strength resulted from high densities of Guinier–Preston (G-P) zones and dislocations. This study shows that severe plastic deformation has the potential to significantly enhance the mechanical properties of precipitate hardening 7000 series Al alloys.

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Microstructural Evolution and Mechanical Properties of Ultrafine Grained Commercially Pure 1100 Aluminum Alloy Processed by Accumulative Roll-Bonding (ARB)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.625 ◽

2004 ◽

Vol 449-452 ◽

pp. 625-628 ◽

Cited By ~ 17

Author(s):

Yong Suk Kim ◽

T.O. Lee ◽

Dong Hyuk Shin

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Microstructural Evolution ◽

Sliding Wear ◽

Al Alloy ◽

Commercially Pure ◽

Transmission Electron ◽

Ultrafine Grained ◽

Average Grain Size ◽

Accumulated Strain

The ARB process has been carried out up to seven cycles on a commercial purity 1100 aluminum alloy to obtain ultra-fine grains with the average grain size of 500 nm. Microstructural evolution of the ARB processed aluminum alloy was examined by a transmission electron microscopy as a function of accumulated total strain. Mechanical properties including hardness, tensile property, and sliding wear characteristics of the severely deformed Al alloy were also investigated. Grain boundaries of the ARB processed alloy were diffusive and poorly defined after the initial ARB cycles, however they changed to well-defined high angle boundaries with the increase of the accumulated strain. Though hardness and strength of the ARB processed alloy were enhanced significantly, wear resistance of the processed alloy hardly increased. The mechanical properties were discussed in connection with the microstructure.

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Effect of Severe Plastic Deformation at Ambient Temperature on Microstructures and Mechanical Properties of Aluminum Alloy 2519

Materials Science Forum ◽

10.4028/www.scientific.net/msf.745-746.298 ◽

2013 ◽

Vol 745-746 ◽

pp. 298-302

Author(s):

Ying Liu ◽

Ruo Lin Cheng ◽

Jing Tao Wang ◽

He Zhang ◽

Xin Ming Zhang

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Tensile Strength ◽

Aluminum Alloy ◽

Severe Plastic Deformation ◽

Cold Rolling ◽

Ambient Temperature ◽

Hardness Test ◽

Equal Channel Angular Processing ◽

Microstructures And Mechanical Properties

The effect of severe plastic deformation at ambient temperature on microstructures and mechanical properties of aluminum alloy 2519 was investigated by means of tensile test, micro-hardness test, optical microscopy and scanning electron microscopy. The results showed that tensile strength of as-queched 2519 alloy was greatly enhanced to nearly 550MPa (ultimate tensile strength, UTS) and 520MPa (yield strength, YS) by severe cold rolling or equal channel angular processing (ECAP) while the elongation decreased to 5%. The 2519 alloy could obtain quite well mechanical properties as much as 80 % and 12 passes cold rolling deformation. This indicated that pre-deformation by ECAP is effective in improving the mechanical properties of 2519 alloy by grain refinement, strain aging and high density dislocations.

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