scholarly journals Dynamic deformation and fracture behavior of ultrafine-grained aluminum alloy fabricates by equal-channel angular pressing

2005 ◽  
Vol 36 (11) ◽  
pp. 2947-2955 ◽  
Author(s):  
Yang Gon Kim ◽  
Byoungchul Hwang ◽  
Sunghak Lee ◽  
Woo Gyeom Kim ◽  
Dong Hyuk Shin
Keyword(s):  
Aluminum Alloy ◽  
Equal Channel Angular Pressing ◽  
Fracture Behavior ◽  
Dynamic Deformation ◽  
Angular Pressing ◽  
Deformation And Fracture ◽  
Ultrafine Grained

DYNAMIC DEFORMATION AND FRACTURE BEHAVIOR OF ULTRA-FINE-GRAINED DUAL PHASE STEELS FABRICATED BY EQUAL CHANNEL ANGULAR PRESSING

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1159-1164
Author(s):  
YANG GON KIM ◽  
BYOUNGCHUL HWANG ◽  
SUNGHAK LEE ◽  
DONG HYUK SHIN
Keyword(s):  
Equal Channel Angular Pressing ◽  
Fracture Behavior ◽  
Dynamic Deformation ◽  
Maximum Shear Stress ◽  
Annealed Specimen ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Fine Grained ◽  
Angular Pressing ◽  
Deformation And Fracture

In this study, dynamic deformation and fracture behavior of ultra-fine-grained dual phase steels fabricated by equal channel angular pressing (ECAP) was compared with that of conventionally annealed ultra-fine-grained steels. In the ECAPed conventionally annealed specimen, pearlites were decomposed, and the ferrite grain size increased up to 0.5 μm. The intercritically annealed specimen consisted of dual phases of equiaxed ferrites and blocky martensites (volume fraction; 35%, size; 1 μm). The dynamic torsional test results indicated that maximum shear stress of the annealed specimens was lower than that of the as-pressed specimen, but fracture shear strain was higher. These results suggested that annealing or promoting dual phase microstructures of the ECAPed specimens could be a good way to increase the fracture resistance under dynamic loading, as it reduced or prevented the formation of adiabatic shear bands or voids. In particular, the ECAPed ultra-fine-grained dual phase steel can be more reliably used under dynamic conditions since it overcomes the shortcomings of reduced strain hardenability, ductility, and dynamic properties.

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.

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