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Strain localization during high-pressure torsion of high-strength metals and alloys
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DOI：10.1007/s10853-026-13558-2.png)
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Abstract
En 中文
High-Pressure Torsion (HPT) is an effective method for refining the structure of metallic materials down to the nanocrystalline state. However, a number of studies have demonstrated that the actual accumulated strain achieved during the HPT process for many metals and alloys is significantly lower than theoretically expected. It has been suggested, in some studies, that this discrepancy is caused by a slippage effect, while some studies reported that slippage is negligible during HPT. To clarify this issue, in the present work, the joint HPT of two half-disks was employed to evaluate the deformation behavior of various metals under HPT with n = 0.25 revolutions. The investigations revealed that in samples of the Fe–30Mn–5Si alloy (wt.%), which is a bioresorbable alloy with a face-centered cubic (FCC) lattice and high strength, and Zr62Cu22Al10Fe5Dy1 bulk metallic glass (BMG), which is a high-strength amorphous material, slippage was not detected, but shear deformation was also minimal within the bulk of the sample after HPT processing. In this case, HPT processing induced a relative displacement of the surface layer to a depth of 60 μm. Thus, the deformation in these materials under HPT is localized in the near-surface zone of the samples adjacent to the anvils. Such strain localization was not detected in HPT processing of pure copper, which has a low strength. Strain localization was not detected in ARMCO-Fe with medium strength using the HPT facility in Japan, but it was detected in the facility in Russia. Consequently, this study establishes the reasons why the actual shear strain during HPT is lower than the theoretically calculated value, and determines how this is influenced by material strength and the technical characteristics of the HPT equipment employed.
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3.9
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3.2W
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