On Practical Forming Limits in Superplastic Forming of Aluminum Sheet

2007 ◽  
Vol 16 (3) ◽  
pp. 274-283 ◽  
Author(s):  
Yingbing Luo ◽  
Craig Miller ◽  
George Luckey ◽  
Peter Friedman ◽  
Yinghong Peng
Keyword(s):  
Superplastic Forming ◽  
Aluminum Sheet ◽  
Forming Limits ◽  
Practical Forming

Forming limits of an age hardenable aluminum sheet after pre-straining and annealing

2014 ◽  
Vol 82 ◽  
pp. 13-24 ◽  
Author(s):  
Kaifeng Wang ◽  
John E. Carsley ◽  
Lianhong Zhang ◽  
Thomas B. Stoughton ◽  
Jingjing Li ◽  
...  
Keyword(s):  
Aluminum Sheet ◽  
Forming Limits

Tribological Testing of Graphite and Boron Nitride Lubricant Formulations for High Temperature Aluminum Sheet Forming Processes

2007 ◽  
Author(s):  
M. David Hanna ◽  
Paul E. Krajewsk ◽  
James G. Schroth
Keyword(s):  
High Temperature ◽  
Boron Nitride ◽  
Superplastic Forming ◽  
Solid Lubricants ◽  
Sheet Forming ◽  
Aluminum Sheet ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Performance And Evaluation

The tribological behavior of AA5083 aluminum sheet sliding against tool steel impacts the quality of components manufactured with the elevated temperature metal forming processes such as Quick Plastic Forming (QPF), Superplastic Forming (SPF), or warm forming. This study focuses on the tribological performance and evaluation of alternative solid lubricants using a flat-on-flat tribo-tester to simulate sheet forming at high temperature applications. Improved lubricant formulations containing boron nitride with graphite additions were found to enhance lubricity while maintaining good adherence to the surface of the aluminum blank at a temperature of 450°C.

Friction Stir Processing of Commercial Grade Marine Alloys to Enable Superplastic Forming

2010 ◽  
Vol 433 ◽  
pp. 141-151 ◽  
Author(s):  
Christopher B. Smith ◽  
Arun Mohan ◽  
Rajiv S. Mishra ◽  
Murray Mahoney ◽  
Mike Miles ◽  
...  
Keyword(s):  
Friction Stir Processing ◽  
Material Properties ◽  
Low Cost ◽  
Superplastic Forming ◽  
Aluminum Sheet ◽  
Complex Geometries ◽  
Processing Conditions ◽  
Friction Stir ◽  
Commercial Grade

The use of friction stir processing (FSP) on marine grade aluminum sheet has been investigated with the objective of locally enhancing the material properties. This can potentially allow low cost commercial grade aluminum to be used in superplastic forming applications or further enhance the formability to allow more complex geometries to be formed. FSP has been demonstrated to enable superplasticity (uniform elongations >250%) in 5083-H116 over a range of friction stir processing conditions.

Two-Stage Superplastic Forming of a V-Shaped Aluminum Sheet into a Trough with Deep and Irregular Contour

2013 ◽  
Vol 22 (8) ◽  
pp. 2241-2246 ◽  
Author(s):  
Hsien-Chin Lan ◽  
Yiin-Kuen Fuh ◽  
Shyong Lee ◽  
Chun-Lin Chu ◽  
Tien-Chan Chang
Keyword(s):  
Superplastic Forming ◽  
Aluminum Sheet ◽  
Two Stage

A very rapid in situ Kikuchi technique to determine relative crystal misorientation

1988 ◽  
Vol 46 ◽  
pp. 830-831
Author(s):  
J. I. Bennetch
Keyword(s):  
Electron Beam ◽  
Analytical Techniques ◽  
Superplastic Forming ◽  
The Other ◽  
Kikuchi Pattern ◽  
Kikuchi Line ◽  
Line Analysis

In a recent study of the superplastic forming (SPF) behavior of certain Al-Li-X alloys, the relative misorientation between adjacent (sub)grains proved to be an important parameter. It is well established that the most accurate way to determine misorientation across boundaries is by Kikuchi line analysis. However, the SPF study required the characterization of a large number of (sub)grains in each sample to be statistically meaningful, a very time-consuming task even for comparatively rapid Kikuchi analytical techniques.In order to circumvent this problem, an alternate, even more rapid in-situ Kikuchi technique was devised, eliminating the need for the developing of negatives and any subsequent measurements on photographic plates. All that is required is a double tilt low backlash goniometer capable of tilting ± 45° in one axis and ± 30° in the other axis. The procedure is as follows. While viewing the microscope screen, one merely tilts the specimen until a standard recognizable reference Kikuchi pattern is centered, making sure, at the same time, that the focused electron beam remains on the (sub)grain in question.

“Cavity” formation in superplastically deformed aluminium alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 958-959
Author(s):  
A. Cziráki ◽  
E. Ková-csetényi ◽  
T. Torma ◽  
T. Turmezey
Keyword(s):  
Grain Boundaries ◽  
Aluminium Alloys ◽  
Superplastic Deformation ◽  
Volume Fraction ◽  
Superplastic Forming ◽  
Polished Surface ◽  
Cavity Formation ◽  
Stress Concentrations ◽  
Electron Microscopic ◽  
Commercial Aluminium

It is known that the formation of cavities during superplastic deformation can be correlated with the development of stress concentrations at irregularities along grain boundaries such as particles, ledges and triple points. In commercial aluminium alloys Al-Fe-Si particles or other coarse constituents may play an important role in cavity formation.Cavity formation during superplastic deformation was studied by optical metallography and transmission scanning electron microscopic investigations on Al-Mg-Si and Al-Mg-Mn alloys. The structure of particles was characterized by selected area diffraction and X-ray micro analysis. The volume fraction of “voids” was determined on mechanically polished surface.It was found by electron microscopy that strongly deformed regions are formed during superplastic forming at grain boundaries and around coarse particles.According to electron diffraction measurements these areas consist of small micro crystallized regions. See Fig.l.Comparing the volume fraction and morphology of cavities found by optical microscopy a good correlation was established between that of micro crystalline regions.

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