Grain boundary tension induced strain recovery following superplastic flow

1994 ◽  
Vol 42 (9) ◽  
pp. 2921-2928 ◽  
Author(s):  
R.I. Todd
Keyword(s):  
Grain Boundary ◽  
Strain Recovery ◽  
Superplastic Flow

Texture Analysis for Determining the Rate Controlling Process in the Transient and Steady State Regions of Superplastic Flow

2011 ◽  
Vol 702-703 ◽  
pp. 360-365 ◽  
Author(s):  
K. Anantha Padmanabhan ◽  
S. Sankaran ◽  
V. Subramanya Sarma ◽  
Satyam Suwas ◽  
Olaf Engler ◽  
...  
Keyword(s):  
Steady State ◽  
Grain Boundary ◽  
Grain Shape ◽  
Grain Boundary Sliding ◽  
Superplastic Flow ◽  
Controlling Mechanism ◽  
Al 5083 Alloy ◽  
Boundary Sliding ◽  
Mechanisms Of Deformation ◽  
Transient And Steady State

Even anisotropic superplastic flow, which is a result of an elongated grain shape and texture, can lead to extreme elongations to fracture (superplasticity). Therefore, to identify the mechanisms of deformation present during superplastic flow alone, the effects of the microstructure should be eliminated first. Using an Al 5083 alloy, in which an equi-axed microstructure is present from the beginning, it is shown that grain boundary sliding, accompanied by grain rotations, is the rate controlling mechanism.

The nature of grain boundary sliding and the superplastic flow

1983 ◽  
Vol 78 (2) ◽  
pp. 439-448 ◽  
Author(s):  
R. Z. Valiev ◽  
O. A. Kaibyshev ◽  
V. V. Astanin ◽  
A. K. Emaletdinov
Keyword(s):  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Superplastic Flow ◽  
Boundary Sliding

Cooperative Grain Boundary Processes in Superplastic Flow

2004 ◽  
Vol 447-448 ◽  
pp. 41-48 ◽  
Author(s):  
Michael Zelin ◽  
Amiya K. Mukherjee
Keyword(s):  
Grain Boundary ◽  
Superplastic Flow

On the Rate Controlling Mechanism Operative During Superplastic Flow

1971 ◽  
Vol 29 ◽  
pp. 110-111
Author(s):  
E. Gecklini ◽  
L. J. Anderson ◽  
C. R. Barrett
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Grain Boundary Sliding ◽  
Superplastic Flow ◽  
Localized Deformation ◽  
Controlling Mechanism ◽  
Boundary Sliding ◽  
Shape Changes ◽  
Mechanism Operative

This investigation is concerned with a determination of the rate controlling mechanisms operative during superplastic flow. The experimental technique involves the deformation of Pb-Sn eutectic samples in a scanning electron microscope. Surface observations of grain shape changes and grain boundary shearing are used to assess the importance of the various deformation mechanisms. As described below, the experimental observations are consistent with a model of grain boundary sliding in association with localized deformation near grain boundaries to maintain coherency.Experiments are carried out using a specially designed tensile stage in an AMR 900 microscope. The gage section of the tensile sample is 3 mm long, 2 mm wide and 0.5 mm thick. The grain size range investigated is 2 - 5μ and deformation is carried out at room temperature. The tensile stage is designed such that the ends of the sample are translated in opposite directions.

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