Abstract
Many (if not a majority) of metals and alloys evince substantial softening with torsion deformation to strains not usually achievable in tension. Of course, softening has long been observed by discontinuous dynamic recrystallization (DDRX) but this paper will discuss cases where softening is associated by texture development with large-strain deformation that is not reliant on changes in the dislocation density. This paper discusses the work of the current authors on FCC metals and alloys and extends to a new discussion of BCC and HCP cases. The analysis of the basis for torsional softening in BCC steel and HCP Zr discussed here is a novel concept that has not been addressed in the literature before.
Highlights
Metals and alloys deformed in torsion to relatively large strains, typically greater than 1, often show softening
This texture change appears responsible for the modest softening observed during the high temperature tests
Aluminum is the most studied case,case, and and explanation for the softening fallen in two basic categories, texture developthe the explanation for the softening has has fallen in two basic categories, texture development ment and changes the hardening microstructure and changes in theinhardening microstructure
Summary
Metals and alloys deformed in torsion (pure shear) to relatively large strains, typically greater than 1, often show softening (typically on the order of 20%). Some high angle boundaries may form from shear bands [14], but the classically defined continuous dynamic recrystallization (CDRX) [3,15,16] is not occurring. Fiber texture forms, which is indicative of slip occurring mainly on prism and pyramidal planes This texture change appears responsible for the modest softening observed during the high temperature tests. Metals 2021, 11, 1059 of slip occurring mainly on prism and pyramidal planes
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