Friction Stir Superplasticity for Unitized Structures ：A volume in the Friction Stir Welding and Processing Book Series ( Friction Stir Welding and Processing )

Publication subTitle ：A volume in the Friction Stir Welding and Processing Book Series

Publication series ：Friction Stir Welding and Processing

Author： Ma   Zongyi;Mishra   Rajiv S.  

Publisher： Elsevier Science‎

Publication year： 2014

E-ISBN: 9780124200135

P-ISBN(Paperback): 9780124200067

P-ISBN(Hardback):  9780124200067

Subject： TG441.3 weld method

Language： ENG

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Description

This book describes the fundamentals and potential applications of ‘friction stir superplasticity for unitized structures’. Conventional superplastic forming of sheets is limited to the thickness of 3 mm because the fine grained starting material is produced by rolling. Friction stir superplasticity has grown rapidly in the last decade because of the effectiveness of microstructural refinement. The thickness of the material remains almost constant, and that allows for forming of thick sheets/plates, which was not possible before. The field has reached a point where designers have opportunities to expand the extent of unitized structures, which are structures in which the traditional primary part and any supporting structures are fabricated as a single unit. With advanced optimization and material considerations, this class of structures can be lighter weight and more efficient, making them less costly, as well as mechanically less complex, reducing areas of possible failure.

  • Discusses how friction stir processing allows selective microstructural refinement without thickness change
  • Demonstrates how higher thickness sheets and plates can be superplastically formed
  • Examples are presented for aluminum, magnesium and titanium alloys
  • Covers the production of low-cost unitized structures by selectively processing cast sheets/plates

Chapter

Front Cover

Friction Stir Superplasticity for Unitized Structures

Copyright Page

Contents

Preface

Acknowledgments

1 Introduction

2 Friction Stir Microstructure for Superplasticity

3 High-Strain-Rate Superplasticity

3.1 Superplastic Behavior

3.2 Microstructural Evolution During Superplastic Deformation

4 Low-Temperature Superplasticity

4.1 LTSP of FSP Al–Zn–Mg–Sc

4.2 LTSP of FSP Al–Mg–Zr

5 Superplasticity of Cast Alloy—An Example

6 Superplastic Deformation Mechanism

6.1 High Strain Rate Superplasticity

6.2 Low Temperature Superplasticity

6.3 Enhanced Deformation Kinetics

6.4 Superplastic Mechanism Map for FSP Aluminum Alloys

7 Cavitation During Superplasticity

7.1 Cavity Formation and Growth

7.2 Factor Influencing Cavity Formation and Growth

7.2.1 Strain Rate

7.2.2 Test Temperature

7.2.3 Grain Size

7.3 Cavity Growth Mechanism and Critical Strain

7.4 Comparison Between Cavitation Behaviors of FSP and TMP Aluminum Alloys

8 Superplastic Forming of Friction Stir Processed Plates

9 Potential of Extending Superplasticity to Thick Sections

10 Potential of Superplastic Forming of Low-Cost Cast Plate

11 Superplastic Punch Forming and Superplastic Forging

12 Friction Stir Welding and Superplastic Forming for Multisheet Structures

13 Summary

References

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