Microstructural Evolution and Tensile Testing of a Bi–Sn (57/43) Alloy Processed by Tube High-Pressure Shearing

Processing by tube high-pressure shearing (t-HPS) is a relatively new technique now in the early phase of development within the family of severe plastic deformation (SPD) by comparison with other established techniques such as Equal-Channel Angular Pressing, High Pressure Torsion and Accumulative Roll Bonding. Nevertheless, the technique has demonstrated already its capability to restructure materials to featured microstructures that not reached by the other processing procedures and, in addition, it is efficient in refining the microstructure in a way that is consistent with the other SPD processes.The initialization and development of the principle and processing technique of t-HPS is reviewed in this report together with the microstructure and property improvements of the processed materials. It is demonstrated that there is a unique capability of t-HPS in preparing distinctly featured microstructures and producing unprecedented properties of the processed material by comparison with other SPD processes.As a new SPD technique that is currently under development, several open topics are proposed which are significant for obtaining an understanding of the physical characteristics of t-HPS and for further exploiting the potential of t-HPS in establishing unprecedented properties through distinct and unusual microstructures.

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“…This high elongation is attributed to the breaking of the lamellar structure and the very small grain size. 76)…”

Section: Unprecedented Superplasticity Of An Alloy Synthe-mentioning

confidence: 99%

Tube High-Pressure Shearing: A Simple Shear Path to Unusual Microstructures and Unprecedented Properties

Liu

Wang

et al. 2023

Mater. Trans.

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“…Very recently, tests were conducted by processing a cast Bi-43% Sn (wt. %) alloy by t-HPS using a procedure described earlier [52]. Samples were processed through 20 and 100 revolutions at room temperature and then tensile tests were undertaken at 298 K using different strain rates from 1.0 × 10 -4 to 1.0 × 10 -2 s -1 .…”

Section: The Introduction Of a New Procedures For Achieving Grain Ref...mentioning

confidence: 99%

New developments in the processing of metallic alloys for achieving exceptional superplastic properties

Wang

2023

Superplasticity in Advanced Materials

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Abstract. The process of superplasticity has a long history dating back to the early experiments of Pearson conducted in the U.K. in 1934. Since that time, superplasticity has become of increasing importance because of the recognition that superplastic forming provides a simple procedure for the processing of complex and curved parts for use in a wide range of industrial applications. The fundamental requirement for superplastic flow is a small grain size typically smaller than ~10 µm. These fine grains were achieved traditionally through the use of appropriate thermo-mechanical processing which provided a procedure for developing microstructures having grain sizes of the order of a few micrometers. Over the last two decades the processing procedures have been further developed through the use of techniques based on the application of severe plastic deformation (SPD) where it is possible to achieve ultrafine-grained materials with grains sizes in the submicrometer or even the nanometer range. Early SPD experiments were conducted using the processes of equal-channel angular pressing or high-pressure torsion but more recently a new and improved technique was developed which is known as tube high-pressure shearing (t-HPS). Experiments show that t-HPS provides a capability of producing exceptional superplastic elongations with, for example, an elongation of ~2320% in a Bi-Sn alloy when tested at a strain rate of 10-4 s-1 at room temperature. This report examines these recent developments with an emphasis on the potential for improving the superplastic capabilities of metallic alloys.

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“…Steels and iron-based alloys [2-9]; • Non-ferrous alloys with fcc-(Ni- [10,11] and Cu-based [12][13][14]), or hcp crystal structure (Mg- [15,16] and Ti-based [17,18]). Other examples include Zirconium [19], Bi-Sn alloy [20] or polycarbonate resins [21]; • Multicomponent and high-entropy alloys [22][23][24]; • General theoretical studies on crystal plasticity [25][26][27].…”

mentioning

confidence: 99%

Crystal Plasticity (Volume II)

Polkowski

2022

Crystals

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Microstructural Evolution and Tensile Testing of a Bi–Sn (57/43) Alloy Processed by Tube High-Pressure Shearing

Cited by 8 publications

References 34 publications

Tube High-Pressure Shearing: A Simple Shear Path to Unusual Microstructures and Unprecedented Properties

Tube High-Pressure Shearing: A Simple Shear Path to Unusual Microstructures and Unprecedented Properties

New developments in the processing of metallic alloys for achieving exceptional superplastic properties

Crystal Plasticity (Volume II)

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