Download e-book for iPad: Friction Stir Superplasticity for Unitized Structures by Zongyi Ma and Rajiv S. Mishra (Auth.)

By Zongyi Ma and Rajiv S. Mishra (Auth.)

ISBN-10: 0124200060

ISBN-13: 9780124200067

This booklet describes the basics and power functions of 'friction stir superplasticity for unitized structures'. traditional superplastic forming of sheets is restricted to the thickness of three mm as the high-quality grained beginning fabric is produced by means of rolling. Friction stir superplasticity has grown swiftly within the final decade as a result of effectiveness of microstructural refinement. The thickness of the cloth continues to be virtually consistent, and that enables for forming of thick sheets/plates, which used to be impossible earlier than. the sphere has reached some degree the place designers have possibilities to extend the level of unitized buildings, that are buildings during which the conventional fundamental half and any aiding buildings are fabricated as a unmarried unit. With complex optimization and fabric concerns, this classification of constructions will be lighter weight and extra effective, making them less expensive, in addition to robotically much less advanced, decreasing parts of attainable failure.

  • Discusses how friction stir processing permits selective microstructural refinement with no thickness change
  • Demonstrates how greater thickness sheets and plates should be superplastically formed
  • Examples are offered for aluminum, magnesium and titanium alloys
  • Covers the creation of inexpensive unitized constructions through selectively processing forged sheets/plates

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Additional resources for Friction Stir Superplasticity for Unitized Structures

Sample text

The solute drag mechanism in AlÀMg alloys usually takes place at intermediate temperatures around 300 C [77]. 3Sc alloy, Nieh et al. 5). 5 μm) FSP AlÀ4MgÀ1Zr were obtained at 425À580 C, solute drag is unlikely to be the rate controlling deformation mechanism. Therefore, it is very likely that a threshold stress is operative in the FSP AlÀ4MgÀ1Zr. The superplastic data of the FSP AlÀ4MgÀ1Zr were examined using the threshold stress approach. 1). 2). SEM examinations on the surfaces of superplastically deformed specimens can provide additional information about the superplastic deformation mechanism.

4 SEM micrographs showing surface morphologies of FSP AlÀ4MgÀ1Zr superplastically deformed to failure at an initial strain rate 1 3 1021 s21 and a temperature of (a) 525 C, (b) 500 C, (c) 450 C, and (d) 425 C (tensile axis is horizontal) [26]. 5 µm 470ºC 490ºC . 5 Variation of ε_ kTd 2 =Dg Eb3 with normalized effective stress, (σ 2 σ0)/E, for FSP AlÀ4MgÀ1Zr and 7075Al [26]. 44 Friction Stir Superplasticity for Unitized Structures inverse grain size dependence of 2 for superplastic flow. Second, the temperature dependence of superplastic flow is similar to the activation energy for aluminum grain boundary self-diffusion.

5 indicates that grain boundary sliding is the dominant deformation mechanism [67]. Furthermore, flow stress of the FSP sample is significantly lower than that of the cast sample at initial strain rates ,3 3 1022 s21 for 530 C and at temperatures of 470À570 C for an initial strain rate of 1 3 1023 s21. This again is attributed to a significantly-refined microstructure in the FSP sample. The overall implication of this study is that FSP is a very effective processing technique to create a thermally stable fine-grained microstructure in cast aluminum alloys resulting in significant superplasticity.

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Friction Stir Superplasticity for Unitized Structures by Zongyi Ma and Rajiv S. Mishra (Auth.)

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