INFLUENCE OF A LOW-TEMPERATURE PLASTIC-DEFORMATION PROCESS ON THE MICROSTRUCTURE OF AN Al-Si-Mg ALUMINUM ALLOY

This work was planned to modify the microstructure of a solution-treated, cast Al-Si-Mg aluminum alloy by a plastic deformation method at a cryogenic temperature. It was found that cryo-rolling is an efficient low-temperature, plastic-deformation method that causes the transformation of a dendritic microstructure to an ultrafine-grained counterpart with a high dislocation density and the redistribution of hard silicon particles in the cast aluminum alloy. The results show cryo-rolling strains lead to an increment of the dislocation density because of the annihilation of the dislocations’ dynamic recovery. The microstructural refinement imposed by cryo-rolling seems to lead to a notable strength enhancement of the material because of the coupled impact of dislocation-strengthening and grain-boundary-strengthening mechanisms.

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Uneven plastic deformation behavior of high-strength cast aluminum alloy tube in multi-pass hot power backward spinning

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-016-8800-4 ◽

2016 ◽

Vol 88 (1-4) ◽

pp. 907-921 ◽

Cited By ~ 8

Author(s):

Gangyao Zhao ◽

Chengjun Lu ◽

Ranyang Zhang ◽

Zhenghua Guo ◽

Mingyuan Zhang

Keyword(s):

Plastic Deformation ◽

Aluminum Alloy ◽

Deformation Behavior ◽

High Strength ◽

Cast Aluminum Alloy ◽

Cast Aluminum ◽

Alloy Tube ◽

Plastic Deformation Behavior ◽

Aluminum Alloy Tube

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Mechanical Properties of a Spray-Cast Aluminum Alloy Processed by Severe Plastic Deformation

THERMEC 2006 - Materials Science Forum ◽

10.4028/0-87849-428-6.141 ◽

2007 ◽

pp. 141-148

Author(s):

Cheng Xu ◽

Megumi Kawasaki ◽

Minoru Furukawa ◽

Zenji Horita ◽

Terence G. Langdon

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Aluminum Alloy ◽

Severe Plastic Deformation ◽

Cast Aluminum Alloy ◽

Cast Aluminum

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Creep and Mechanical Properties of a Commercial Aluminum Alloy Processed by ECAP

Materials Science Forum ◽

10.4028/www.scientific.net/msf.503-504.77 ◽

2006 ◽

Vol 503-504 ◽

pp. 77-82 ◽

Cited By ~ 4

Author(s):

Cheng Xu ◽

Terence G. Langdon

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Strain Rate ◽

Testing Temperature ◽

Cast Aluminum Alloy ◽

Cast Aluminum ◽

Creep Tests ◽

Double Shear ◽

Angular Pressing ◽

Ultrafine Grained

A commercial spray-cast aluminum alloy, having a composition of Al-11.5% Zn-2.5% Mg-0.9% Cu-0.2% Zr, was processed by equal-channel angular pressing (ECAP) to give an ultrafine-grained microstructure with a grain size of ~0.3 μm and a fracturing of the rod-shaped MgZn2 precipitates. The mechanical properties of the alloy were investigated using microhardness testing at ambient temperature and tensile testing at a temperature of 673 K. In addition, creep tests were conducted using a double-shear testing facility at temperatures from 473 to 673 K. The results show the microhardness decreases with increasing numbers of passes in ECAP and high strain rate superplasticity is achieved after processing by ECAP at 473 K for 6 or 8 passes. A maximum elongation of >1000% was recorded at a strain rate of 10-2 s-1 when testing at 673 K. The creep tests show the creep rates are faster in the as-pressed material than in the as-received material when testing at the same applied stress and testing temperature.

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