Effect of Chemical Composition on Structure and Properties of Ultrafine Grained Cu-Cr-Zr Alloys Produced by Equal-Channel Angular Pressing

The microstructure evolution and stress corrosion cracking (SCC) behaviors of ultrafine-grained (UFG) Cu-Cr-Zr alloys processed by equal-channel angular pressing (ECAP) and coarse-grain (CG) Cu-Cr-Zr alloys within NaNO2 solution were systematically investigated in the current study. After deformation by eight ECAP passes, the grain size was refined to ~200 nm. The slow strain rate tensile (SSRT) tests showed that the ultimate tensile strength (UTS) of CG samples in solution was slightly lower than that in the air, and the elongation was decreased from 57.3% to 52.6%. In contrast, both the UTS and elongation of UFG samples in air and solution were almost identical. In NaNO2 solution, the CG fracture surface showed an obvious dissolution, microvoids, and minor cracks, while the surface of the UFG fracture was relatively smooth. The resistance of UFG samples to SCC could be significantly enhanced compared with CG samples. The grain boundary volume fraction of UFG alloy was dramatically increased, which reduced the formation of pitting corrosion. In addition, the uniform distribution of Cr particles also improved the corrosion resistance of UFG alloys.

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Structural heterogeneity of ultrafine-grained FCC metals processed through equal-channel angular pressing on mesoscale level

10.1063/1.5132007 ◽

2019 ◽

Author(s):

K. V. Ivanov

Keyword(s):

Equal Channel Angular Pressing ◽

Structural Heterogeneity ◽

Fcc Metals ◽

Angular Pressing ◽

Ultrafine Grained

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Superplastic Behavior in Ultrafine-Grained Materials Produced by Equal-Channel Angular Pressing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.579.29 ◽

2008 ◽

Vol 579 ◽

pp. 29-40 ◽

Cited By ~ 3

Author(s):

Cheng Xu ◽

Megumi Kawasaki ◽

Roberto B. Figueiredo ◽

Zhi Chao Duan ◽

Terence G. Langdon

Keyword(s):

Equal Channel Angular Pressing ◽

High Strain ◽

Processing Method ◽

Strain Rates ◽

Bulk Materials ◽

Superplastic Behavior ◽

Angular Pressing ◽

Ultrafine Grained ◽

Ultrafine Grained Materials ◽

Aluminum And Magnesium Alloys

Equal-channel angular pressing (ECAP) is a convenient processing method for refining the grain size of bulk materials to the submicrometer level. Metallic alloys processed by ECAP often exhibit excellent superplastic characteristics including superplasticity at high strain rates. This paper summarizes recent experiments designed to evaluate the occurrence of superplasticity in representative aluminum and magnesium alloys and in the Zn-22% Al eutectoid alloy.

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Enhanced Impact Toughness at Ambient Temperatures of Ultrafine-Grained Al-26 wt.% Si Alloy Produced by Equal-Channel Angular Pressing

Journal of Materials Engineering and Performance ◽

10.1007/s11665-018-3283-0 ◽

2018 ◽

Vol 27 (5) ◽

pp. 2131-2137 ◽

Cited By ~ 2

Author(s):

Jinghua Jiang ◽

Ting Yuan ◽

Jun Shi ◽

Lingling Zhang ◽

Aibin Ma ◽

...

Keyword(s):

Impact Toughness ◽

Equal Channel Angular Pressing ◽

Ambient Temperatures ◽

Angular Pressing ◽

Ultrafine Grained

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Effect of Equal Channel Angular Pressing and Annealing on Corrosion Resistance of Al-Cu Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.803.226 ◽

2013 ◽

Vol 803 ◽

pp. 226-229

Author(s):

Da Ran Fang ◽

Chun Liu ◽

Feng Fang Liu

Keyword(s):

Corrosion Resistance ◽

Low Temperature ◽

Equal Channel Angular Pressing ◽

Annealing Treatment ◽

Coarse Grained ◽

Nacl Solution ◽

Angular Pressing ◽

Cu Alloy ◽

Low Temperature Annealing ◽

Ultrafine Grained

Al-3.9wt.%Cu alloy was subjected to equal channel angular pressing (ECAP) and subsequent low temperature annealing treatment, and the corrosion resistance of the samples was investigated by potentiodynamic polarization measurements in 3.5% NaCl solution. The results show that the corrosion rate of the ultrafine-grained alloy increases, in comparison with the coarse-grained alloy. Meanwhile, it is noted that the corrosion resistance of the alloy subjected to ECAP can be improved by relief annealing.

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