The Quasi Static Fracture Behavior of a Bulk Al-Cr-Fe Alloy Made by Consolidating Micron- and Nano-Sized Powders

2005 ◽  
Vol 23 ◽  
pp. 255-258 ◽  
Author(s):  
T.S. Srivatsan ◽  
S. Givens ◽  
Meslet Al-Hajri ◽  
M. Petraroli ◽  
R. Radhakrishnan ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Tensile Deformation ◽  
Plasma Pressure ◽  
Fracture Characteristics ◽  
Tensile Response ◽  
Inert Environment ◽  
Deformation And Fracture ◽  
Ames Laboratory ◽  
Powder Particles ◽  
Static Fracture

Micron-sized powders of an Al-7Cr-1Fe alloy were prepared by the technique of Gas Atomization Reaction Synthesis (GARS) at the Ames Laboratory (Ames, Iowa, USA). A pre-alloyed stock of the aluminum alloy was melted and atomized in an inert environment. A mixture of micron-sized and nano-sized powder particles was consolidated in a vacuum environment using the technique of plasma pressure compaction (P2CTM). The powders were initially pulsed at 150oC for 10 minutes and subsequently consolidated at 550oC under a pressure of 40 MPa for 10 minutes. In this paper, the tensile deformation and fracture characteristics of the aluminum alloy are highlighted at two different test temperatures. An attempt is made to elucidate the microscopic mechanisms governing tensile response and fracture in light of the competing and mutually interactive influences of intrinsic microstructural features, deformation characteristics of the constituents of the material, and test temperature.

The Influence of Processing on Microstructural Development, Tensile Response and Fracture Behavior of Aluminum Alloy 5083

2011 ◽  
Vol 410 ◽  
pp. 175-186 ◽  
Author(s):  
Troy D. Topping ◽  
Ying Li ◽  
Enrique J. Lavernia ◽  
K. Manigandan ◽  
T.S. Srivatsan
Keyword(s):  
Aluminum Alloy ◽  
Fracture Behavior ◽  
Tensile Deformation ◽  
Coarse Grained ◽  
Microstructural Development ◽  
Deformation Kinetics ◽  
Aluminum Alloy 5083 ◽  
Fine Grain ◽  
Deformation And Fracture ◽  
Specific Influence

In this paper, the specific influence of quasi-isostatic forging and rolling of cryomilled powder on microstructural development and resultant tensile deformation and fracture behavior of aluminum alloy 5083 is highlighted and comparison made with the coarse grained counterpart. The specific influence and contribution of strain hardening to enhancing strength of the ultra-fine grain microstructure of the aluminum alloy is presented and discussed. It is shown that the capability of the ultra fine grain microstructure to recover strength through the mechanism of work hardening is quite similar to the conventionally processed counterpart. The influence and role of intrinsic microstructural features in governing tensile deformation and fracture behavior is elaborated upon. The viable microscopic mechanisms governing final fracture behavior is discussed in light of the competing and mutually interactive influences of nature of loading, intrinsic microstructural effects, and deformation kinetics. Key Words: aluminum alloy 5083, processing, microstructure, tensile properties, fracture

Atomistic Study on Nano Stress-Strain Curves of α-Fe

1997 ◽  
Vol 492 ◽  
Author(s):  
Shenyang Hu ◽  
Matthias Ludwig ◽  
Liam Farrissey ◽  
Siegfried Schmauder
Keyword(s):  
Boundary Conditions ◽  
Tensile Deformation ◽  
Tensile Axis ◽  
Plane Boundary ◽  
Uniaxial Tensile ◽  
Stress Strain ◽  
Fracture Characteristics ◽  
Deformation And Fracture ◽  
Dislocation Movement ◽  
Atomistic Study

ABSTRACTThe atomistic processes and stress-strain-curves during uniaxial tensile deformation of a single α-Fe nanocrystal have been studied with the molecular static method. Periodic boundary conditions are imposed along one direction perpendicular to the tensile axis to model plane strain conditions. The effects of the model sizes in plane, boundary conditions and crystal orientations on the stress-strain curves are systematically analyzed. Various deformation evidences such as dislocation movement, dislocation piling up and twinning are clearly observed. The deformation and fracture characteristics of a-Fe and their dependencies on the boundary conditions are investigated.

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