Factors influencing superplastic behavior in a magnesium ZK60 alloy processed by equal-channel angular pressing

2009 ◽  
Vol 503 (1-2) ◽  
pp. 141-144 ◽  
Author(s):  
Roberto B. Figueiredo ◽  
Terence G. Langdon
Keyword(s):  
Equal Channel Angular Pressing ◽  
Superplastic Behavior ◽  
Angular Pressing ◽  
Factors Influencing ◽  
Zk60 Alloy

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

2008 ◽  
Vol 579 ◽  
pp. 29-40 ◽  
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.

Effect of equal-channel angular pressing on superplastic behavior of eutectic Pb–Sn alloy

2012 ◽  
Vol 34 ◽  
pp. 235-241 ◽  
Author(s):  
Ehab A. El-Danaf ◽  
Khalil Abdelrazek Khalil ◽  
Mahmoud S. Soliman
Keyword(s):  
Equal Channel Angular Pressing ◽  
Superplastic Behavior ◽  
Angular Pressing

Effect of Equal-Channel Angular Pressing on the Creep Resistance of Precipitation-Strengthened Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 897-902 ◽  
Author(s):  
Vàclav Sklenička ◽  
Petr Král ◽  
Jiří Dvořák ◽  
Marie Kvapilová ◽  
Megumi Kawasaki ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Creep Resistance ◽  
Creep Behaviour ◽  
Intensive Research ◽  
Angular Pressing ◽  
Factors Influencing ◽  
Zr Alloys

Despite intensive research efforts in precipitation-strengthened alloys processed by equal-channel angular pressing (ECAP), so far only a few investigations have been conducted on their creep behaviour and the results from these studies are controversial. This paper examines these differences and evaluates some factors influencing the creep resistance of the binary Al-0.2%Sc and Cu-0.2% Zr alloys processed by ECAP.

Factors Influencing Ductility in Ultrafine-Grained Metals Processed by Equal-Channel Angular Pressing

2009 ◽  
Vol 633-634 ◽  
pp. 341-352 ◽  
Author(s):  
Roberto B. Figueiredo ◽  
Zhi Chao Duan ◽  
Megumi Kawasaki ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Elevated Temperatures ◽  
Testing Temperature ◽  
Ambient Temperatures ◽  
Angular Pressing ◽  
Factors Influencing ◽  
Ultrafine Grained ◽  
Processed Material

The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement to the submicrometer or even the nanometer range. This paper examines the characteristics of metals processed by equal-channel angular pressing with special emphasis on the levels of ductility that may be attained. It is shown that the amount of ductility is dependent not only upon the composition of the material but also, and to a major extent, upon the testing temperature. Specifically, the ductilities are often low at ambient temperatures where the strength of the as-processed material is relatively high but, by contrast, exceptionally high superplastic ductilities may be achieved over short ranges of strain rate when testing at elevated temperatures.

Factors influencing the equal-channel angular pressing of Ti–6Al–4V alloy having lamellar microstructure

2008 ◽  
Vol 493 (1-2) ◽  
pp. 164-169 ◽  
Author(s):  
Young Gun Ko ◽  
Duck Young Hwang ◽  
Dong Hyuk Shin ◽  
Sunghak Lee ◽  
Chong Soo Lee
Keyword(s):  
Equal Channel Angular Pressing ◽  
Lamellar Microstructure ◽  
Angular Pressing ◽  
Factors Influencing

Influence of Number of Passes in ECAP on Superplastic Behavior in a Magnesium Alloy

2008 ◽  
Vol 584-586 ◽  
pp. 170-175 ◽  
Author(s):  
Roberto B. Figueiredo ◽  
Terence G. Langdon
Keyword(s):  
Strain Rate ◽  
Tensile Testing ◽  
Flow Behavior ◽  
Rate Sensitivity ◽  
Initial Strain Rate ◽  
Tensile Tests ◽  
Superplastic Behavior ◽  
Angular Pressing ◽  
Zk60 Alloy ◽  
Number Of Passes

Tensile tests were carried out at 473 K with initial strain rate of 10-4 s-1 in samples of a ZK60 alloy (Mg-5.5% Zn-0.5% Zr) processed by different number of passes using Equal-Channel Angular Pressing (ECAP). The measured superplastic elongations ranged from ~930% to a record of ~3050%. The flow behavior was found to vary with the number of passes of ECAP. It is shown that strain-hardening due to grain growth and the evolution of the strain rate sensitivity with the strain determines the flow behavior and final elongations. The results are consistent with theories of plastic flow in tensile testing.

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