Closure to “Discussion of ‘Shear Front-Lamella Structure in Large Strain Plastic Deformation Processes’” (1972, ASME J. Eng. Ind., 94, p. 314)

1972 ◽  
Vol 94 (1) ◽  
pp. 314-315
Author(s):  
J. T. Black
Keyword(s):  
Plastic Deformation ◽  
Large Strain ◽  
Deformation Processes ◽  
Shear Front ◽  
Lamella Structure

Shear Front-Lamella Structure in Large Strain Plastic Deformation Processes

1972 ◽  
Vol 94 (1) ◽  
pp. 307-313 ◽  
Author(s):  
J. T. Black
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
Large Strain ◽  
Machining Processes ◽  
Fundamental Understanding ◽  
Deformation Processes ◽  
Copper Aluminum ◽  
Shear Front ◽  
Lamella Structure ◽  
Scanning Electron

The examination of the surface morphology of copper, aluminum, and steel chips produced by standard shop machining processes through the use of scanning electron microscopy has led to a more fundamental understanding of large strain plastic deformation processes. The interpretation of these findings is discussed in terms of well documented dislocation mechanisms typically associated with tensile and compression deformation of metal crystals. The effect that such investigations will have on the true understanding of the mechanisms involved in plastic deformation processes is noted.

On the Fundamental Mechanism of Large Strain Plastic Deformation: Electron Microscopy of Metal Cutting Chips

1971 ◽  
Vol 93 (2) ◽  
pp. 507-526 ◽  
Author(s):  
J. T. Black
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
Metal Cutting ◽  
Large Strain ◽  
Cutting Parameters ◽  
Machining Process ◽  
Aluminum Chips ◽  
Shear Front ◽  
Microscopy Techniques ◽  
Fundamental Mechanism

The process of large strain plastic deformation, such as commonly found in the machining process, has been investigated by transmission and scanning electron microscopy techniques. The lamella-shear front nature of deformation in copper and aluminum chips has been elucidated fully and the occurrence of lamellae has been correlated with crystallographic and metal cutting parameters.

Microstructural Design of an AlMgSi Alloy via ECAP Processing: An Advanced SPD Manufacturing Technique for NC/UFG Materials

2015 ◽  
Vol 1114 ◽  
pp. 143-148
Author(s):  
Nicolae Serban ◽  
Doina Răducanu ◽  
Vasile Danut Cojocaru ◽  
Nicolae Ghiban
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Shape Change ◽  
Large Strain ◽  
Metallographic Analysis ◽  
Cross Sectional ◽  
Ecap Processing ◽  
Microstructural Design ◽  
Almgsi Alloy

Severe plastic deformation (SPD) has received enormous interest over the last two decades as a method capable of producing fully dense and bulk ultra-fine grained (UFG) and nanocrystalline (NC) materials. Significant grain refinement obtained by SPD leads to improvement of mechanical, microstructural and physical properties. Compared to classical deformation processes, the big advantage of SPD manufacturing techniques, represented in particular by equal channel angular pressing (ECAP) is the lack of shape-change deformation and the consequent possibility to impart extremely large strain. In ECAP processing, the workpiece is pressed through a die in which two channels of equal cross-section intersect at an angle of ϕ and an additional angle of ψ define the arc of curvature at the outer point of intersection of the two channels. As a result of pressing, the sample theoretically deforms by simple shear and retains the same cross-sectional area to allow repeated pressings for several cycles. A commercial AlMgSi alloy was investigated in our study. The specimens were processed at room temperature for multiple passes, using three different ECAP dies. All samples (ECAP processed and as-received) were subjected to metallographic analysis and mechanical testing. Several correlations between the main processing parameters and the resulting microstructural aspect and mechanical features for the processed material were established. It was shown that severe plastic deformation by means of ECAP processing can be used in aluminum alloys microstructural design as an advanced tool for grain refinement in order to attain the desired microstructure and mechanical properties.

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